diff --git a/pkgs/development/python-modules/esper/default.nix b/pkgs/development/python-modules/esper/default.nix
index de27eee121b2..b6e16816a8f7 100644
--- a/pkgs/development/python-modules/esper/default.nix
+++ b/pkgs/development/python-modules/esper/default.nix
@@ -6,7 +6,7 @@
   pytestCheckHook,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "esper";
   version = "3.3";
   pyproject = true;
@@ -14,7 +14,7 @@ buildPythonPackage rec {
   src = fetchFromGitHub {
     owner = "benmoran56";
     repo = "esper";
-    tag = "v${version}";
+    tag = "v${finalAttrs.version}";
     hash = "sha256-DZAF2B40ulSn2MQadklT32Svcm1j0e/hIxrxISO07TI=";
   };
 
@@ -26,8 +26,8 @@ buildPythonPackage rec {
   meta = {
     description = "ECS (Entity Component System) for Python";
     homepage = "https://github.com/benmoran56/esper";
-    changelog = "https://github.com/benmoran56/esper/blob/${src.rev}/RELEASE_NOTES";
+    changelog = "https://github.com/benmoran56/esper/blob/${finalAttrs.src.tag}/RELEASE_NOTES";
     license = lib.licenses.mit;
     maintainers = with lib.maintainers; [ sigmanificient ];
   };
-}
+})