diff --git a/.github/workflows/gem_push.yml b/.github/workflows/gem_push.yml
index 21c20ffd6..66c5f4030 100644
--- a/.github/workflows/gem_push.yml
+++ b/.github/workflows/gem_push.yml
@@ -20,7 +20,7 @@ jobs:
       id-token: write
     steps:
       - uses: actions/checkout@v6
-      - uses: ruby/setup-ruby@v1
+      - uses: ruby/setup-ruby@v1.306.0
         with:
           ruby-version: ruby
           bundler-cache: true
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 386f03e46..6a70ffd5a 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -16,7 +16,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
       - name: Set up Ruby
-        uses: ruby/setup-ruby@v1
+        uses: ruby/setup-ruby@v1.306.0
         with:
           ruby-version: "3.4"
           bundler-cache: true
diff --git a/.github/workflows/mutant.yml b/.github/workflows/mutant.yml
index 7c0819f1e..389972c7d 100644
--- a/.github/workflows/mutant.yml
+++ b/.github/workflows/mutant.yml
@@ -16,7 +16,7 @@ jobs:
     steps:
     - uses: actions/checkout@v6
     - name: Set up Ruby
-      uses: ruby/setup-ruby@v1
+      uses: ruby/setup-ruby@v1.306.0
       with:
         ruby-version: '3.4'
         bundler-cache: true
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 1e1fe605c..08c92d51c 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -19,7 +19,7 @@ jobs:
     steps:
     - uses: actions/checkout@v6
     - name: Set up Ruby
-      uses: ruby/setup-ruby@v1
+      uses: ruby/setup-ruby@v1.306.0
       with:
         ruby-version: ${{ matrix.ruby-version }}
         bundler-cache: true # runs 'bundle install' and caches installed gems automatically
diff --git a/.github/workflows/typecheck.yml b/.github/workflows/typecheck.yml
index 4caa209ad..9e74f0291 100644
--- a/.github/workflows/typecheck.yml
+++ b/.github/workflows/typecheck.yml
@@ -16,7 +16,7 @@ jobs:
     steps:
     - uses: actions/checkout@v6
     - name: Set up Ruby
-      uses: ruby/setup-ruby@v1
+      uses: ruby/setup-ruby@v1.306.0
       with:
         ruby-version: '3.4'
         bundler-cache: true
diff --git a/.github/workflows/yardstick.yml b/.github/workflows/yardstick.yml
index 823619873..09bae1901 100644
--- a/.github/workflows/yardstick.yml
+++ b/.github/workflows/yardstick.yml
@@ -16,7 +16,7 @@ jobs:
     steps:
     - uses: actions/checkout@v6
     - name: Set up Ruby
-      uses: ruby/setup-ruby@v1
+      uses: ruby/setup-ruby@v1.306.0
       with:
         ruby-version: '3.4'
         bundler-cache: true