diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 64eb29d..0581ea2 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -32,8 +32,6 @@ jobs:
         # constraint that a matrix cannot be empty.
         #
         # We test only the oldest and latest Ruby versions for each Rails version.
-        gemfile: [gemfiles/rails_5.gemfile]
-        ruby: ['2.3', '2.6']
         adapter: ['trilogy', 'mysql2']
         include:
           - gemfile: gemfiles/rails_6.0.gemfile