diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 6622d7b..2cea25a 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -6,6 +6,9 @@ on:
   schedule:
     - cron: "0 8,20 * * *"
 
+permissions:
+  contents: read
+
 jobs:
   unit-tests:
     name: Unit tests
diff --git a/.github/workflows/pull_request.yml b/.github/workflows/pull_request.yml
index a4147b8..60d979c 100644
--- a/.github/workflows/pull_request.yml
+++ b/.github/workflows/pull_request.yml
@@ -4,6 +4,9 @@ on:
   pull_request:
     types: [opened, reopened, synchronize]
 
+permissions:
+  contents: read
+
 jobs:
   soundness:
     name: Soundness