diff --git a/pkgs/development/python-modules/dyn/default.nix b/pkgs/development/python-modules/dyn/default.nix
index e4bbe4e071d9..a645bd9cc842 100644
--- a/pkgs/development/python-modules/dyn/default.nix
+++ b/pkgs/development/python-modules/dyn/default.nix
@@ -3,12 +3,12 @@
 
 buildPythonPackage rec {
   pname = "dyn";
-  version = "1.6.3";
+  version = "1.6.4";
   name  = "${pname}-${version}";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "1xq90fliix5nbv934s3wf2pahmx6m2b9y0kqwn192c76qh7xlzib";
+    sha256 = "f3843938edac38cddf8e0bd2e0e884bb1b7845c265ae3605cd9e27eb98f90956";
   };
 
   buildInputs = [ glibcLocales ];