diff --git a/flake.lock b/flake.lock
index fa71ceb5..e4bf8c71 100644
--- a/flake.lock
+++ b/flake.lock
@@ -3,16 +3,15 @@
     "lowdown-src": {
       "flake": false,
       "locked": {
-        "lastModified": 1617481909,
-        "narHash": "sha256-SqnfOFuLuVRRNeVJr1yeEPJue/qWoCp5N6o5Kr///p4=",
+        "lastModified": 1633514407,
+        "narHash": "sha256-Dw32tiMjdK9t3ETl5fzGrutQTzh2rufgZV4A/BbxuD4=",
         "owner": "kristapsdz",
         "repo": "lowdown",
-        "rev": "148f9b2f586c41b7e36e73009db43ea68c7a1a4d",
+        "rev": "d2c2b44ff6c27b936ec27358a2653caaef8f73b8",
         "type": "github"
       },
       "original": {
         "owner": "kristapsdz",
-        "ref": "VERSION_0_8_4",
         "repo": "lowdown",
         "type": "github"
       }
@@ -20,28 +19,31 @@
     "nix": {
       "inputs": {
         "lowdown-src": "lowdown-src",
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": "nixpkgs",
+        "nixpkgs-regression": "nixpkgs-regression"
       },
       "locked": {
-        "lastModified": 1628586117,
-        "narHash": "sha256-8hS4xy7fq3z9XZIMYm4sQi9SzhcYqEJfdbwgDePoWuc=",
+        "lastModified": 1643066034,
+        "narHash": "sha256-xEPeMcNJVOeZtoN+d+aRwolpW8mFSEQx76HTRdlhPhg=",
         "owner": "NixOS",
         "repo": "nix",
-        "rev": "a6ba313a0aac3b6e2fef434cb42d190a0849238e",
+        "rev": "a1cd7e58606a41fcf62bf8637804cf8306f17f62",
         "type": "github"
       },
       "original": {
-        "id": "nix",
-        "type": "indirect"
+        "owner": "NixOS",
+        "ref": "2.6.0",
+        "repo": "nix",
+        "type": "github"
       }
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1624862269,
-        "narHash": "sha256-JFcsh2+7QtfKdJFoPibLFPLgIW6Ycnv8Bts9a7RYme0=",
+        "lastModified": 1632864508,
+        "narHash": "sha256-d127FIvGR41XbVRDPVvozUPQ/uRHbHwvfyKHwEt5xFM=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "f77036342e2b690c61c97202bf48f2ce13acc022",
+        "rev": "82891b5e2c2359d7e58d08849e4c89511ab94234",
         "type": "github"
       },
       "original": {
@@ -50,6 +52,21 @@
         "type": "indirect"
       }
     },
+    "nixpkgs-regression": {
+      "locked": {
+        "lastModified": 1643052045,
+        "narHash": "sha256-uGJ0VXIhWKGXxkeNnq4TvV3CIOkUJ3PAoLZ3HMzNVMw=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "215d4d0fd80ca5163643b03a33fde804a29cc1e2",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "rev": "215d4d0fd80ca5163643b03a33fde804a29cc1e2",
+        "type": "indirect"
+      }
+    },
     "root": {
       "inputs": {
         "nix": "nix",
diff --git a/flake.nix b/flake.nix
index 1b29fa72..cfeeba85 100644
--- a/flake.nix
+++ b/flake.nix
@@ -2,6 +2,7 @@
   description = "A Nix-based continuous build system";
 
   inputs.nixpkgs.follows = "nix/nixpkgs";
+  inputs.nix.url = github:NixOS/nix/2.6.0;
 
   outputs = { self, nixpkgs, nix }:
     let
diff --git a/t/jobs/empty-dir-builder.sh b/t/jobs/empty-dir-builder.sh
index addc7ef6..949216e0 100755
--- a/t/jobs/empty-dir-builder.sh
+++ b/t/jobs/empty-dir-builder.sh
@@ -1,3 +1,6 @@
 #! /bin/sh
 
+# Workaround for https://github.com/NixOS/nix/pull/6051
+echo "some output"
+
 mkdir $out