diff --git a/pkgs/development/python-modules/llguidance/default.nix b/pkgs/development/python-modules/llguidance/default.nix
index a7e60c9717c5..46d1c530e138 100644
--- a/pkgs/development/python-modules/llguidance/default.nix
+++ b/pkgs/development/python-modules/llguidance/default.nix
@@ -20,21 +20,21 @@
   transformers,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "llguidance";
-  version = "1.4.0";
+  version = "1.5.0";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "guidance-ai";
     repo = "llguidance";
-    tag = "v${version}";
-    hash = "sha256-+DRJIzFqJEeinwJVyXuRQ1niQmDoNhKLHrfvFnjDL8c=";
+    tag = "v${finalAttrs.version}";
+    hash = "sha256-dLX01+8R6SbirFda10dufhMxARSVIXj2y8xIj95Od7A=";
   };
 
   cargoDeps = rustPlatform.fetchCargoVendor {
-    inherit src pname version;
-    hash = "sha256-SQ8ahSCJUaYF7PzPfRUjCdJTJ811oTyxiLDfRre2BO0=";
+    inherit (finalAttrs) src pname version;
+    hash = "sha256-fmQ+A6spWUR0bY5LG+MGW9uTFmYJPQjx8tGxkFXttgc=";
   };
 
   nativeBuildInputs = [
@@ -96,8 +96,8 @@ buildPythonPackage rec {
   meta = {
     description = "Super-fast Structured Outputs";
     homepage = "https://github.com/guidance-ai/llguidance";
-    changelog = "https://github.com/guidance-ai/llguidance/blob/v${version}/CHANGELOG.md";
+    changelog = "https://github.com/guidance-ai/llguidance/blob/${finalAttrs.src.tag}/CHANGELOG.md";
     license = lib.licenses.mit;
     maintainers = with lib.maintainers; [ GaetanLepage ];
   };
-}
+})