diff --git a/pkgs/development/python-modules/pybase64/default.nix b/pkgs/development/python-modules/pybase64/default.nix
index 0547a5d3ba04..60ab64655551 100644
--- a/pkgs/development/python-modules/pybase64/default.nix
+++ b/pkgs/development/python-modules/pybase64/default.nix
@@ -2,11 +2,11 @@
 
 buildPythonPackage rec {
   pname = "pybase64";
-  version = "0.3.1";
+  version = "0.4.0";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "c974bff394e16817596fab686a0c7deb4995a468b035b02a788b6dbfd1e6bdeb";
+    sha256 = "d415057b17bd8acf65e7a2f5d25e468b5b39df3290c7d9dbb75c0785afbdf3cf";
   };
 
   propagatedBuildInputs = [ six ];