diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index 84d9978..2869cfd 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -66,6 +66,7 @@ jobs:
           ruby-version: ${{ matrix.ruby }}
           bundler: 1.17
           bundler-cache: true
+          rubygems: latest
         env:
           JSON_VERSION: ${{ matrix.json }}