diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index df65b4a20..b9f8b8f54 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -4,6 +4,9 @@ on:
   pull_request: {}
   workflow_dispatch: {}
 
+permissions:
+  contents: read
+
 jobs:
   build:
     name: Build and Test
diff --git a/.github/workflows/conformance.yml b/.github/workflows/conformance.yml
index c0c7b3e24..7014ada8a 100644
--- a/.github/workflows/conformance.yml
+++ b/.github/workflows/conformance.yml
@@ -6,6 +6,9 @@ on:
     branches: [main]
   workflow_dispatch:
 
+permissions:
+  contents: read
+
 env:
   CONFORMANCE: '@modelcontextprotocol/conformance@0.2.0-alpha.12'
 
diff --git a/.github/workflows/maven-central-release.yml b/.github/workflows/maven-central-release.yml
index 099b2ac7f..c637b09af 100644
--- a/.github/workflows/maven-central-release.yml
+++ b/.github/workflows/maven-central-release.yml
@@ -3,6 +3,9 @@ name: Release to Maven Central
 on:
   workflow_dispatch:
 
+permissions:
+  contents: read
+
 jobs:
   publish:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/publish-snapshot.yml b/.github/workflows/publish-snapshot.yml
index bef449ebe..6eaf6529b 100644
--- a/.github/workflows/publish-snapshot.yml
+++ b/.github/workflows/publish-snapshot.yml
@@ -8,6 +8,9 @@ on:
       - 1.1.x
       - 2.1.x
 
+permissions:
+  contents: read
+
 jobs:
   build:
     name: Build branch