diff --git a/.github/workflows/.tests-matrix.yaml b/.github/workflows/.tests-matrix.yaml
index 9878cfbcf83..9a9bae65d01 100644
--- a/.github/workflows/.tests-matrix.yaml
+++ b/.github/workflows/.tests-matrix.yaml
@@ -22,6 +22,9 @@ defaults:
   run:
     shell: bash
 
+env:
+  PYTHONWARNDEFAULTENCODING: 'true'
+
 jobs:
   mypy:
     name: mypy