diff --git a/pkgs/development/python-modules/waterfurnace/default.nix b/pkgs/development/python-modules/waterfurnace/default.nix
index 09fdbd2c079a..8e07a8ecbd30 100644
--- a/pkgs/development/python-modules/waterfurnace/default.nix
+++ b/pkgs/development/python-modules/waterfurnace/default.nix
@@ -11,14 +11,14 @@
 
 buildPythonPackage (finalAttrs: {
   pname = "waterfurnace";
-  version = "1.6.2";
+  version = "1.6.4";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "sdague";
     repo = "waterfurnace";
     tag = "v${finalAttrs.version}";
-    hash = "sha256-E5GHO4kRfAg+A3FW674i6ekCrpjwYx5rx7xbTZXuT80=";
+    hash = "sha256-Eh9jmq4VWSDFjU4aFppuJmd1ym8ZAC1/CdSe0iq6ds0=";
   };
 
   build-system = [ setuptools ];