diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 37dfb2a..e9c25a2 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -46,7 +46,7 @@ jobs:
       - name: Test (pure Python fallback)
         shell: bash
         run: |
-          PYTHON_GIL=0 MSGPACK_PUREPYTHON=1 pytest -v test
+          MSGPACK_PUREPYTHON=1 pytest -v test
 
       - name: build packages
         shell: bash