diff --git a/.github/workflows/reviewdog.yml b/.github/workflows/reviewdog.yml
index b03ac6f..5dfbdc4 100644
--- a/.github/workflows/reviewdog.yml
+++ b/.github/workflows/reviewdog.yml
@@ -9,6 +9,7 @@ jobs:
           - 3.1
           - 3.2
           - 3.3
+          - 3.4
 
     runs-on: ubuntu-latest
     steps:
diff --git a/appsignal-sourcemap.gemspec b/appsignal-sourcemap.gemspec
index 9ddb7c1..4a67d9c 100644
--- a/appsignal-sourcemap.gemspec
+++ b/appsignal-sourcemap.gemspec
@@ -20,7 +20,7 @@ Gem::Specification.new do |spec|
 
   spec.files = Dir["lib/**/*", "README.md"]
 
-  spec.add_dependency "rails", ">= 6.1", "< 8.0"
+  spec.add_dependency "rails", ">= 6.1", "< 9.0"
   spec.add_dependency "appsignal", "< 5.0"
   spec.add_dependency "parallel", "~> 1.0"