diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4814fc4f..f8213287 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -88,6 +88,8 @@ jobs:
         path: requirements-dev.txt
     - name: Install JS dependencies
       run: grablib
+      env:
+        PYTHONIOENCODING: 'utf-8'
     - name: Run unittests
       env:
         COLOR: 'yes'