diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 26c7c5b..ed56702 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,7 +10,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ ubuntu-20.04 ]
+        os: [ ubuntu-latest ]
         ruby: [ 2.0.0, 2.1, 2.3, 2.4, 2.5, 2.6, 2.7, '3.0', 3.1, 3.2, 3.3, 3.4, jruby-9.3, jruby-9.4 ]
         gemfile: [ Gemfile, Gemfile.rack-1.x ]
         exclude: