diff --git a/pkgs/development/libraries/tweeny/default.nix b/pkgs/development/libraries/tweeny/default.nix
index d3c30028ba4..f2de470288d 100644
--- a/pkgs/development/libraries/tweeny/default.nix
+++ b/pkgs/development/libraries/tweeny/default.nix
@@ -5,13 +5,13 @@
 
 stdenv.mkDerivation rec {
   pname = "tweeny";
-  version = "3.1.0";
+  version = "3.1.1";
 
   src = fetchFromGitHub {
     owner = "mobius3";
     repo = "tweeny";
     rev = "v${version}";
-    sha256 = "0qvby57g9a2m4afd1mgard3k7nm4ynbvali7nzm1qn3ygdmqid7n";
+    sha256 = "0zk7p21i54hfz0l50617i3gxhxh0n9yy86n2fxg8m26cvf4yhsj7";
   };
 
   nativeBuildInputs = [