diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index dc4bb5c..ea0a784 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -39,6 +39,7 @@ jobs:
           - activesupport_7_0
           - activesupport_7_1
           - activesupport_7_2
+          - activesupport_8_0
         exclude:
           # activesupport 7.0+ requires Ruby 2.7+
           - ruby:    "2.6"
@@ -54,6 +55,16 @@ jobs:
           - ruby:    "3.0"
             gemfile: activesupport_7_2
 
+          # activesupport 8.0+ requires Ruby 3.2+
+          - ruby:    "2.6"
+            gemfile: activesupport_8_0
+          - ruby:    "2.7"
+            gemfile: activesupport_8_0
+          - ruby:    "3.0"
+            gemfile: activesupport_8_0
+          - ruby:    "3.1"
+            gemfile: activesupport_8_0
+
     env:
       BUNDLE_GEMFILE: gemfiles/${{ matrix.gemfile }}.gemfile
 
diff --git a/gemfiles/activesupport_8_0.gemfile b/gemfiles/activesupport_8_0.gemfile
new file mode 100644
index 0000000..fb7ccf1
--- /dev/null
+++ b/gemfiles/activesupport_8_0.gemfile
@@ -0,0 +1,7 @@
+source "https://rubygems.org"
+
+gem "activesupport", "~> 8.0.0"
+
+eval_gemfile "#{__dir__}/common.gemfile"
+
+gemspec path: "../"