diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5b7dd53..b2b8eb7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,11 +16,16 @@ jobs:
           - '3.0'
           - '3.1'
           - '3.2'
+          - '3.3'
           - 'truffleruby'
         gemfile:
           - 'activemodel_6.1'
           - 'activemodel_7.0'
+          - 'activemodel_7.1'
           - 'activemodel_main'
+        exclude:
+          - ruby: '3.0'
+            gemfile: 'activemodel_main'
 
     env:
       BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/${{ matrix.gemfile }}.gemfile
diff --git a/gemfiles/activemodel_7.1.gemfile b/gemfiles/activemodel_7.1.gemfile
new file mode 100644
index 0000000..00eff9e
--- /dev/null
+++ b/gemfiles/activemodel_7.1.gemfile
@@ -0,0 +1,5 @@
+source "https://rubygems.org"
+
+gem "activemodel", "~> 7.1"
+
+gemspec path: "../"