diff --git a/nix/mkPackageAttrs.nix b/nix/mkPackageAttrs.nix
index 66942b8..e429cbe 100644
--- a/nix/mkPackageAttrs.nix
+++ b/nix/mkPackageAttrs.nix
@@ -4,6 +4,8 @@
   postPatch = ''
     substituteInPlace pyproject.toml \
       --replace-fail "cryptg-anyos" "cryptg"
+    substituteInPlace tgpy/version.py \
+      --replace-fail "IS_DEV_BUILD = True" "IS_DEV_BUILD = False"
   '';
   pythonRelaxDeps = [
     "cryptg"