diff --git a/.github/workflows/self-test.yml b/.github/workflows/self-test.yml
index 18cd314..c7e3169 100644
--- a/.github/workflows/self-test.yml
+++ b/.github/workflows/self-test.yml
@@ -6,6 +6,12 @@ on:
       - main
   pull_request: null
 
+defaults:
+  run:
+    shell: bash -euxo pipefail {0}
+env:
+  PS4: \e[36m$\e[m
+
 jobs:
   reglar:
     permissions: