diff --git a/ci/ruby.yml b/ci/ruby.yml
index 7a78b45..76c166e 100644
--- a/ci/ruby.yml
+++ b/ci/ruby.yml
@@ -21,7 +21,10 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: Set up Ruby
-      uses: ruby/setup-ruby@v1
+    # To automatically get bug fixes and new Ruby versions for ruby/setup-ruby,
+    # change this to (see https://github.com/ruby/setup-ruby#versioning):
+    # uses: ruby/setup-ruby@v1
+      uses: ruby/setup-ruby@ec106b438a1ff6ff109590de34ddc62c540232e0
       with:
         ruby-version: 2.6
     - name: Install dependencies