diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index e6b53dd..aac040e 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -13,7 +13,7 @@ jobs:
       fail-fast: false
       matrix:
         ruby-version:
-          - jruby
+          - jruby-9.4
           - 2.4.10
           - 2.5.9
           - 2.6.10