diff --git a/.github/workflows/test_export_onnx.yml b/.github/workflows/test_export_onnx.yml
index 0cd19a1724c..d1fd4a9723f 100644
--- a/.github/workflows/test_export_onnx.yml
+++ b/.github/workflows/test_export_onnx.yml
@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.9]
+        python-version: ['3.9']
         os: [ubuntu-20.04]
 
     runs-on: ${{ matrix.os }}