diff --git a/.github/workflows/mcdc.yml b/.github/workflows/mcdc.yml
index 54d4800b2..ef1b7b001 100644
--- a/.github/workflows/mcdc.yml
+++ b/.github/workflows/mcdc.yml
@@ -12,6 +12,9 @@ on:
       - reopened
       - synchronize
 
+permissions:
+  contents: read
+
 jobs:
   mcdc:
     name: Run MCDC Analysis