diff --git a/.github/workflows/mynmr_tools_ci.yml b/.github/workflows/mynmr_tools_ci.yml
index dcc0479..acce5c9 100644
--- a/.github/workflows/mynmr_tools_ci.yml
+++ b/.github/workflows/mynmr_tools_ci.yml
@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: '*'
 
+permissions:
+  contents: read
+
 jobs:
 
   # Training Data Project