diff --git a/default.nix b/default.nix
index 30930bc..e304bf8 100644
--- a/default.nix
+++ b/default.nix
@@ -1,4 +1,4 @@
-{ pkgs ? import ./nix {} }:
+{ pkgs ? import ./nix { overlays = [ (import ./nix/overlay.nix) ]; } }:
 
 let
   ofborgOverrides = {
diff --git a/nix/nixpkgs.json b/nix/nixpkgs.json
index dde64ed..714a1d7 100644
--- a/nix/nixpkgs.json
+++ b/nix/nixpkgs.json
@@ -1,7 +1,7 @@
 {
   "url": "https://github.com/nixos/nixpkgs-channels.git",
-  "rev": "201d739b0ffbebceb444864d1856babcd1a666a8",
-  "date": "2018-12-30T01:29:37+00:00",
-  "sha256": "0mfkzmylglpw84w85zs3djpspcx45bg3s62hk4j44dxl2p0fvggj",
+  "rev": "e2b4abe3c8f2e09adfc6a52007841d1b96c89371",
+  "date": "2020-02-19T01:57:21+01:00",
+  "sha256": "1l3jfr74s7wmx3fk5y76ayazbfclvnr532kg1hypbzydp3n372rz",
   "fetchSubmodules": false
 }
diff --git a/nix/overlay.nix b/nix/overlay.nix
new file mode 100644
index 0000000..7e1b7a5
--- /dev/null
+++ b/nix/overlay.nix
@@ -0,0 +1,12 @@
+(self: super: {
+  defaultCrateOverrides = super.defaultCrateOverrides // {
+    openssl-sys = attrs: {
+      buildInputs = [ self.openssl_1_0_2 ];
+      nativeBuildInputs = [ self.pkgconfig ];
+    };
+    openssl = attrs: {
+      DEP_OPENSSL_VERSION = "102";
+    };
+  };
+})
+
diff --git a/php/default.nix b/php/default.nix
index d839f37..552a660 100644
--- a/php/default.nix
+++ b/php/default.nix
@@ -4,10 +4,11 @@
 
 let
   composerEnv = import ./composer-env.nix {
-    inherit (pkgs) stdenv writeTextFile fetchurl php unzip;
+    inherit (pkgs) stdenv writeTextFile fetchurl unzip;
+    php = pkgs.php72;
   };
 in
 import ./php-packages.nix {
   inherit composerEnv noDev;
   inherit (pkgs) fetchurl fetchgit fetchhg fetchsvn;
-}
\ No newline at end of file
+}
diff --git a/release.nix b/release.nix
index 9693e2e..ac2e774 100644
--- a/release.nix
+++ b/release.nix
@@ -15,7 +15,12 @@ let
     (collector: system:
       collector // {
         "${system}" = import ./. {
-          pkgs = import nixpkgs { inherit system; };
+          pkgs = import nixpkgs {
+            inherit system;
+            overlays = [
+              (import ./nix/overlay.nix)
+            ];
+          };
         };
       }
     )