diff --git a/pkgs/development/python-modules/pecan/default.nix b/pkgs/development/python-modules/pecan/default.nix
index 88dff59dfe07..9f3c009f8c12 100644
--- a/pkgs/development/python-modules/pecan/default.nix
+++ b/pkgs/development/python-modules/pecan/default.nix
@@ -17,11 +17,11 @@
 
 buildPythonPackage rec {
   pname = "pecan";
-  version = "1.4.0";
+  version = "1.3.3";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "4b2acd6802a04b59e306d0a6ccf37701d24376f4dc044bbbafba3afdf9d3389a";
+    sha256 = "b5461add4e3f35a7ee377b3d7f72ff13e93f40f3823b3208ab978b29bde936ff";
   };
 
   propagatedBuildInputs = [ singledispatch logutils ];