diff --git a/pkgs/development/libraries/graphene/default.nix b/pkgs/development/libraries/graphene/default.nix
index 7c61b222486f..c439e763e73d 100644
--- a/pkgs/development/libraries/graphene/default.nix
+++ b/pkgs/development/libraries/graphene/default.nix
@@ -5,6 +5,7 @@
 , ninja
 , python3
 , mutest
+, nixosTests
 , glib
 , gtk-doc
 , docbook_xsl
@@ -57,6 +58,12 @@ stdenv.mkDerivation rec {
 
   doCheck = true;
 
+  passthru = {
+    tests = {
+      installedTests = nixosTests.graphene;
+    };
+  };
+
   meta = with stdenv.lib; {
     description = "A thin layer of graphic data types";
     homepage = "https://ebassi.github.com/graphene";
diff --git a/pkgs/development/libraries/mutest/default.nix b/pkgs/development/libraries/mutest/default.nix
index b247706067e7..423a93b69a80 100644
--- a/pkgs/development/libraries/mutest/default.nix
+++ b/pkgs/development/libraries/mutest/default.nix
@@ -6,15 +6,15 @@
 
 stdenv.mkDerivation rec {
   pname = "mutest";
-  version = "unstable-2019-10-12";
+  version = "unstable-2019-08-26";
 
   outputs = [ "out" "dev" ];
 
   src = fetchFromGitHub {
     owner = "ebassi";
     repo = "mutest";
-    rev = "822b5ddf07f957135ba39889d81e513d525b9b8e";
-    sha256 = "0a5fjdq9p0q5bibqngbbpd9lga0gzrv8yj5wgdfb8ylxzg0jph2p";
+    rev = "e6246c9ae4f36ffe8c021f0a80438f6c7a6efa3a";
+    sha256 = "0gdqwq6fvk06wld4rhnw5752hahrvhd69zrci045x25rwx90x26q";
   };
 
   nativeBuildInputs = [