diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 7f98f8e..9004672 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -6,10 +6,16 @@ on: [push, pull_request]
 jobs:
   test-ruby:
     runs-on: ${{ matrix.os }}-latest
+    continue-on-error: ${{ matrix.experimental || false }}
     strategy:
+      fail-fast: false
       matrix:
         os: [ubuntu]
-        ruby-version: ["2.6", "2.7", "3.0", "3.1", "3.2", "3.3", "3.4"]
+        ruby-version: ["2.6", "2.7", "3.0", "3.1", "3.2", "3.3", "3.4", "4.0"]
+        include:
+          - os: ubuntu
+            ruby-version: "head"
+            experimental: true
     steps:
       - uses: actions/checkout@v2
       - name: Setup Ruby ${{ matrix.ruby-version }}