diff --git a/.github/workflows/run_tox_tests.yaml b/.github/workflows/run_tox_tests.yaml
index 1f09a8294..cdd4ba158 100644
--- a/.github/workflows/run_tox_tests.yaml
+++ b/.github/workflows/run_tox_tests.yaml
@@ -6,6 +6,9 @@
 
 name: Run tox tests
 
+permissions:
+  contents: read
+
 on:
   workflow_dispatch:
   push: