diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index ae5a63ce..3edddfdd 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -6,6 +6,7 @@ jobs:
   main:
     runs-on: ubuntu-latest
     strategy:
+      max-parallel: 1
       matrix:
         content_type:
           - text/plain