diff --git a/nix-rust/Cargo.lock b/nix-rust/Cargo.lock
index e4b61c444..6af10d833 100644
--- a/nix-rust/Cargo.lock
+++ b/nix-rust/Cargo.lock
@@ -1,10 +1,5 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-[[package]]
-name = "adler32"
-version = "1.0.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "anyhow"
 version = "1.0.25"
@@ -20,33 +15,10 @@ name = "autocfg"
 version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "backtrace"
-version = "0.3.40"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "backtrace-sys 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
- "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-demangle 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "backtrace-sys"
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "cc 1.0.47 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "base64"
-version = "0.10.1"
+version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
-]
 
 [[package]]
 name = "bit-set"
@@ -82,7 +54,6 @@ version = "0.4.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "either 1.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "iovec 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -94,11 +65,6 @@ dependencies = [
  "ppv-lite86 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "cc"
-version = "1.0.47"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "cfg-if"
 version = "0.1.10"
@@ -113,37 +79,11 @@ dependencies = [
 ]
 
 [[package]]
-name = "cookie"
-version = "0.12.0"
+name = "crossbeam-channel"
+version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
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-version = "0.7.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "cookie 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "failure 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "idna 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "publicsuffix 1.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.103 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
- "try_from 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "crc32fast"
-version = "1.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -195,24 +135,11 @@ dependencies = [
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "ct-logs"
-version = "0.6.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "sct 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "dtoa"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "either"
-version = "1.5.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "encoding_rs"
 version = "0.8.20"
@@ -221,34 +148,6 @@ dependencies = [
  "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "error-chain"
-version = "0.12.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "failure"
-version = "0.1.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "backtrace 0.3.40 (registry+https://github.com/rust-lang/crates.io-index)",
- "failure_derive 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "proc-macro2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "synstructure 0.12.3 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "filetime"
 version = "0.2.8"
@@ -260,17 +159,6 @@ dependencies = [
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 ]
 
-[[package]]
-name = "flate2"
-version = "1.0.13"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "crc32fast 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
- "miniz_oxide 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
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@@ -302,73 +190,61 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "futures-channel-preview"
-version = "0.3.0-alpha.18"
+version = "0.3.0-alpha.19"
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 dependencies = [
- "futures-core-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-sink-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-core-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-sink-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "futures-core-preview"
-version = "0.3.0-alpha.18"
+version = "0.3.0-alpha.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
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-version = "0.1.8"
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- "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
- "num_cpus 1.11.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "futures-executor-preview"
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+version = "0.3.0-alpha.19"
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 dependencies = [
- "futures-core-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-util-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-core-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-util-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
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 [[package]]
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-version = "0.3.0-alpha.18"
+version = "0.3.0-alpha.19"
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 [[package]]
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- "futures-util-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-channel-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-core-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-executor-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-io-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-sink-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-util-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "futures-sink-preview"
-version = "0.3.0-alpha.18"
+version = "0.3.0-alpha.19"
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-dependencies = [
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-]
 
 [[package]]
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+version = "0.3.0-alpha.19"
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 dependencies = [
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- "futures-core-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-io-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-sink-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-channel-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-core-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-io-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-sink-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
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  "slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -386,19 +262,22 @@ dependencies = [
 
 [[package]]
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-version = "0.1.26"
+version = "0.2.0-alpha.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
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  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-core-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-sink-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-util-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
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  "string 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-codec 0.2.0-alpha.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.2.0-alpha.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-sync 0.2.0-alpha.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -434,13 +313,11 @@ dependencies = [
 
 [[package]]
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-version = "0.1.0"
+version = "0.2.0-alpha.3"
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 dependencies = [
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- "tokio-buf 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -450,57 +327,31 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
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-version = "0.12.35"
+version = "0.13.0-alpha.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
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- "h2 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-channel-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-core-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-util-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "h2 0.2.0-alpha.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "http 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
- "http-body 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "http-body 0.2.0-alpha.3 (registry+https://github.com/rust-lang/crates.io-index)",
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- "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pin-project 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
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- "tokio 0.1.22 (registry+https://github.com/rust-lang/crates.io-index)",
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- "want 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
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- "webpki-roots 0.17.0 (registry+https://github.com/rust-lang/crates.io-index)",
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "matches 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "unicode-bidi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "unicode-normalization 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-executor 0.2.0-alpha.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.2.0-alpha.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-net 0.2.0-alpha.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-sync 0.2.0-alpha.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-timer 0.3.0-alpha.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tower-make 0.3.0-alpha.2a (registry+https://github.com/rust-lang/crates.io-index)",
+ "tower-service 0.3.0-alpha.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "want 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -555,6 +406,9 @@ dependencies = [
 name = "lazy_static"
 version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "spin 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [[package]]
 name = "libc"
@@ -614,14 +468,6 @@ dependencies = [
  "unicase 2.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "miniz_oxide"
-version = "0.3.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "adler32 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "mio"
 version = "0.6.21"
@@ -640,6 +486,16 @@ dependencies = [
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "mio-uds"
+version = "0.6.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "iovec 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.21 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "miow"
 version = "0.2.1"
@@ -667,15 +523,15 @@ version = "0.1.0"
 dependencies = [
  "assert_matches 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "hex 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "http 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
  "proptest 0.9.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "reqwest 0.9.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "reqwest 0.10.0-alpha.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "tar 0.4.26 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio 0.1.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio 0.2.0-alpha.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -730,13 +586,26 @@ dependencies = [
 
 [[package]]
 name = "percent-encoding"
-version = "1.0.1"
+version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
-name = "percent-encoding"
-version = "2.1.0"
+name = "pin-project"
+version = "0.4.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "pin-project-internal 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "pin-project-internal"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.11 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [[package]]
 name = "pin-utils"
@@ -775,18 +644,6 @@ dependencies = [
  "tempfile 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "publicsuffix"
-version = "1.5.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "error-chain 0.12.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "idna 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "quick-error"
 version = "1.2.2"
@@ -946,14 +803,6 @@ name = "redox_syscall"
 version = "0.1.56"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "regex"
-version = "1.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "regex-syntax 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "regex-syntax"
 version = "0.6.12"
@@ -969,58 +818,35 @@ dependencies = [
 
 [[package]]
 name = "reqwest"
-version = "0.9.22"
+version = "0.10.0-alpha.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "base64 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "base64 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "cookie 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "cookie_store 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "encoding_rs 0.8.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "flate2 1.0.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-core-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-util-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "http 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.12.35 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper-rustls 0.17.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "http-body 0.2.0-alpha.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.13.0-alpha.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "js-sys 0.3.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "mime 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "mime_guess 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustls 0.16.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "percent-encoding 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.103 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_urlencoded 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_urlencoded 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio 0.1.22 (registry+https://github.com/rust-lang/crates.io-index)",
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- "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-rustls 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-threadpool 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-timer 0.2.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "uuid 0.7.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "webpki-roots 0.17.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio 0.2.0-alpha.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-executor 0.2.0-alpha.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen 0.2.55 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen-futures 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "web-sys 0.3.32 (registry+https://github.com/rust-lang/crates.io-index)",
  "winreg 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "ring"
-version = "0.16.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "cc 1.0.47 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
- "spin 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "untrusted 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "web-sys 0.3.32 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "rustc-demangle"
-version = "0.1.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "rustc_version"
 version = "0.2.3"
@@ -1029,18 +855,6 @@ dependencies = [
  "semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "rustls"
-version = "0.16.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "base64 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "ring 0.16.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "sct 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "webpki 0.21.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "rusty-fork"
 version = "0.2.2"
@@ -1062,15 +876,6 @@ name = "scopeguard"
 version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "sct"
-version = "0.6.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "ring 0.16.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "untrusted 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "semver"
 version = "0.9.0"
@@ -1088,19 +893,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "serde"
 version = "1.0.103"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "serde_derive 1.0.103 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "serde_derive"
-version = "1.0.103"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "proc-macro2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.11 (registry+https://github.com/rust-lang/crates.io-index)",
-]
 
 [[package]]
 name = "serde_json"
@@ -1114,13 +906,13 @@ dependencies = [
 
 [[package]]
 name = "serde_urlencoded"
-version = "0.5.5"
+version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "dtoa 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "itoa 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.103 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1169,17 +961,6 @@ dependencies = [
  "unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "synstructure"
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
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- "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "tar"
 version = "0.4.26"
@@ -1216,138 +997,164 @@ dependencies = [
 
 [[package]]
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-version = "0.1.22"
+version = "0.2.0-alpha.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
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- "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
- "mio 0.6.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-core-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-sink-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-util-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.11.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-current-thread 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
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- "tokio-tcp 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-threadpool 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-timer 0.2.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-executor 0.2.0-alpha.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.2.0-alpha.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-macros 0.2.0-alpha.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-net 0.2.0-alpha.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-sync 0.2.0-alpha.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-timer 0.3.0-alpha.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tracing-core 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
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+name = "tokio-codec"
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+ "futures-core-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
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+ "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.2.0-alpha.6 (registry+https://github.com/rust-lang/crates.io-index)",
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 [[package]]
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 "checksum wasm-bindgen-macro 0.2.55 (registry+https://github.com/rust-lang/crates.io-index)" = "87fcc747e6b73c93d22c947a6334644d22cfec5abd8b66238484dc2b0aeb9fe4"
 "checksum wasm-bindgen-macro-support 0.2.55 (registry+https://github.com/rust-lang/crates.io-index)" = "3dc4b3f2c4078c8c4a5f363b92fcf62604c5913cbd16c6ff5aaf0f74ec03f570"
 "checksum wasm-bindgen-shared 0.2.55 (registry+https://github.com/rust-lang/crates.io-index)" = "ca0b78d6d3be8589b95d1d49cdc0794728ca734adf36d7c9f07e6459508bb53d"
 "checksum wasm-bindgen-webidl 0.2.55 (registry+https://github.com/rust-lang/crates.io-index)" = "3126356474ceb717c8fb5549ae387c9fbf4872818454f4d87708bee997214bb5"
 "checksum web-sys 0.3.32 (registry+https://github.com/rust-lang/crates.io-index)" = "98405c0a2e722ed3db341b4c5b70eb9fe0021621f7350bab76df93b09b649bbf"
-"checksum webpki 0.21.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d7e664e770ac0110e2384769bcc59ed19e329d81f555916a6e072714957b81b4"
-"checksum webpki-roots 0.17.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a262ae37dd9d60f60dd473d1158f9fbebf110ba7b6a5051c8160460f6043718b"
 "checksum weedle 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3bb43f70885151e629e2a19ce9e50bd730fd436cfd4b666894c9ce4de9141164"
 "checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
 "checksum winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)" = "8093091eeb260906a183e6ae1abdba2ef5ef2257a21801128899c3fc699229c6"
diff --git a/nix-rust/Cargo.toml b/nix-rust/Cargo.toml
index 20d1fdaa8..1d199699c 100644
--- a/nix-rust/Cargo.toml
+++ b/nix-rust/Cargo.toml
@@ -11,11 +11,11 @@ crate-type = ["cdylib"]
 [dependencies]
 tar = "0.4"
 libc = "0.2"
-futures-preview = { version = "=0.3.0-alpha.18", features = ["compat"] }
+futures-preview = { version = "=0.3.0-alpha.19", features = ["compat"] }
 #hyper = "0.12"
-reqwest = { version = "0.9", default-features = false, features = ["rustls-tls"] }
+reqwest = { version = "=0.10.0-alpha.2", default-features = false }
 http = "0.1"
-tokio = { version = "0.1", default-features = false }
+tokio = { version = "0.2.0-alpha.6", default-features = false, features = ["rt-full"] }
 lazy_static = "1.4"
 byteorder = "1.3"
 
diff --git a/nix-rust/local.mk b/nix-rust/local.mk
index eaa56fe48..51116b0b3 100644
--- a/nix-rust/local.mk
+++ b/nix-rust/local.mk
@@ -21,7 +21,7 @@ endif
 $(libnixrust_PATH): $(call rwildcard, $(d)/src, *.rs) $(d)/Cargo.toml
 	$(trace-gen) cd nix-rust && CARGO_HOME=$$(if [[ -d vendor ]]; then echo vendor; fi) \
 	$(libnixrust_BUILD_FLAGS) \
-	  RUSTC_BOOTSTRAP=1 cargo build $(RUST_MODE) $$(if [[ -d vendor ]]; then echo --offline; fi) \
+	  cargo build $(RUST_MODE) $$(if [[ -d vendor ]]; then echo --offline; fi) \
 	&& touch target/$(RUST_DIR)/libnixrust.$(SO_EXT)
 
 $(libnixrust_INSTALL_PATH): $(libnixrust_PATH)
diff --git a/nix-rust/src/c.rs b/nix-rust/src/c.rs
index 542df93d2..e8aa99392 100644
--- a/nix-rust/src/c.rs
+++ b/nix-rust/src/c.rs
@@ -14,10 +14,9 @@ pub extern "C" fn unpack_tarfile(
 
 #[no_mangle]
 pub extern "C" fn rust_test() {
-    /*
     use crate::store::{self, Store};
-    use futures::future::{FutureExt, TryFutureExt};
     use std::path::Path;
+    use tokio::runtime::Runtime;
 
     let fut = async move {
         let store: Box<dyn Store> = Box::new(store::BinaryCacheStore::new(
@@ -36,17 +35,21 @@ pub extern "C" fn rust_test() {
         eprintln!("INFO = {:?}", info);
          */
 
-        let closure = store.compute_path_closure(vec![path].into_iter().collect()).await.unwrap();
+        let closure = store
+            .compute_path_closure(vec![path].into_iter().collect())
+            .await
+            .unwrap();
 
         eprintln!("CLOSURE = {:?}", closure.len());
-
-        Ok(())
     };
 
-    tokio::run(fut.boxed().compat());
-     */
+    let rt = Runtime::new().unwrap();
 
+    rt.block_on(fut);
+
+    /*
     let file = std::fs::File::open("test.nar").unwrap();
 
     crate::nar::parse(&mut std::io::BufReader::new(file)).unwrap();
+    */
 }
diff --git a/nix-rust/src/lib.rs b/nix-rust/src/lib.rs
index cda63d2c7..4654d4cc3 100644
--- a/nix-rust/src/lib.rs
+++ b/nix-rust/src/lib.rs
@@ -1,5 +1,3 @@
-#![feature(await_macro, async_await)]
-
 #[macro_use]
 extern crate lazy_static;
 
diff --git a/nix-rust/src/store/binary_cache_store.rs b/nix-rust/src/store/binary_cache_store.rs
index f3c7b39bb..8241dc8f5 100644
--- a/nix-rust/src/store/binary_cache_store.rs
+++ b/nix-rust/src/store/binary_cache_store.rs
@@ -1,6 +1,5 @@
-use super::{Store, StorePath, PathInfo};
+use super::{PathInfo, Store, StorePath};
 use crate::Error;
-use futures::compat::Future01CompatExt;
 
 pub struct BinaryCacheStore {
     base_uri: String,
@@ -27,22 +26,17 @@ impl Store for BinaryCacheStore {
         let store_dir = self.store_dir().to_string();
 
         Box::pin(async move {
-            let response = client
-                .get(&uri)
-                .send()
-                .compat()
-                .await?;
+            let response = client.get(&uri).send().await?;
 
-            if response.status() == reqwest::StatusCode::NOT_FOUND || response.status() == reqwest::StatusCode::FORBIDDEN {
+            if response.status() == reqwest::StatusCode::NOT_FOUND
+                || response.status() == reqwest::StatusCode::FORBIDDEN
+            {
                 return Err(Error::InvalidPath(path));
             }
 
-            let mut response = response.error_for_status()?;
+            let response = response.error_for_status()?;
 
-            let body = response
-                .text()
-                .compat()
-                .await?;
+            let body = response.text().await?;
 
             PathInfo::parse_nar_info(&body, &store_dir)
         })
diff --git a/shell.nix b/shell.nix
index 21ed47121..c709f6a5f 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,6 +1,6 @@
 { useClang ? false }:
 
-with import (builtins.fetchTarball https://github.com/NixOS/nixpkgs-channels/archive/nixos-19.09.tar.gz) {};
+with import (builtins.fetchTarball https://github.com/NixOS/nixpkgs/archive/bb1013511e1e5edcf314df8321acf2f3c536df0d.tar.gz) {};
 
 with import ./release-common.nix { inherit pkgs; };