diff --git a/pkgs/development/libraries/concurrencykit/default.nix b/pkgs/development/libraries/concurrencykit/default.nix
index 276f1219444..3fad256e572 100644
--- a/pkgs/development/libraries/concurrencykit/default.nix
+++ b/pkgs/development/libraries/concurrencykit/default.nix
@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   name    = "concurrencykit-${version}";
-  version = "0.4.4";
+  version = "0.4.5";
 
   src = fetchurl {
     url    = "http://concurrencykit.org/releases/ck-${version}.tar.gz";
-    sha256 = "0m3gzv5l7hw3zwhndjjvwmkhh66lvgnk0mspa2s12r1hlzc91zi3";
+    sha256 = "0mh3z8ibiwidc6qvrv8bx9slgcycxwy06kfngfzfza6nihrymzl9";
   };
 
   enableParallelBuilding = true;