diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 1172a7f9..760f4a52 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -13,7 +13,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2.4.0
     - name: Set up Ruby
-      uses: ruby/setup-ruby@v1.90.0
+      uses: ruby/setup-ruby@v1.91.0
       with:
         bundler-cache: true # runs 'bundle install' and caches installed gems automatically
     - name: Run tests
diff --git a/.github/workflows/schedule-doc-report.yml b/.github/workflows/schedule-doc-report.yml
index a3d89519..2dc43852 100644
--- a/.github/workflows/schedule-doc-report.yml
+++ b/.github/workflows/schedule-doc-report.yml
@@ -10,7 +10,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2.4.0
     - name: Set up Ruby
-      uses: ruby/setup-ruby@v1.90.0
+      uses: ruby/setup-ruby@v1.91.0
       with:
         bundler-cache: true # runs 'bundle install' and caches installed gems automatically
     - name: Generate report
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 1c0341bb..19374ba1 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -11,7 +11,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2.4.0
     - name: Set up Ruby
-      uses: ruby/setup-ruby@v1.90.0
+      uses: ruby/setup-ruby@v1.91.0
       with:
         bundler-cache: true # runs 'bundle install' and caches installed gems automatically
     - name: Run tests