diff --git a/.github/workflows/development.yml b/.github/workflows/development.yml
index 450ef842..97a104a5 100644
--- a/.github/workflows/development.yml
+++ b/.github/workflows/development.yml
@@ -4,8 +4,13 @@ on: [push, pull_request]
 
 jobs:
   test:
+    runs-on: ${{matrix.os}}-latest
+    continue-on-error: ${{matrix.experimental}}
+    
     strategy:
       matrix:
+        experimental: [false]
+        
         os:
           - ubuntu
           - macos
@@ -16,18 +21,19 @@ jobs:
           - 2.7
         
         include:
-          - os: 'ubuntu'
+          - experimental: true
+            os: ubuntu
             ruby: 2.7
             env: BUNDLE_GEMFILE=gems/rack1.gemfile
-          - os: 'ubuntu'
+          - experimental: true
+            os: ubuntu
             ruby: 2.7
             env: BUNDLE_GEMFILE=gems/rack3.gemfile
-          - os: 'ubuntu'
+          - experimental: true
+            os: ubuntu
             ruby: 2.6
             env: COVERAGE=PartialSummary,Coveralls
     
-    runs-on: ${{matrix.os}}-latest
-    
     steps:
     - uses: actions/checkout@v1
     - uses: ruby/setup-ruby@v1