diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1488b34..2b01843 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,6 +15,9 @@ jobs:
       matrix:
         ruby: ["2.7", "3.0", "3.1", "3.2"]
         rails: ["6.1", "7.0"]
+        include:
+          - ruby: "3.2"
+            rails: "main"
 
     env:
       RAILS_ENV: test
diff --git a/Gemfile b/Gemfile
index 624a304..37b905c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,6 +6,7 @@ rails_version = ENV.fetch("RAILS_VERSION", "6.0")
 
 if rails_version == "main"
   rails_constraint = { github: "rails/rails" }
+  gem "rack", "< 3" # To compatible with capybara. https://github.com/teamcapybara/capybara/issues/2640
 else
   rails_constraint = "~> #{rails_version}"
 end