diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 7b1828b..b944abb 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -16,7 +16,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby-version: ['2.5', '3.0', '3.1', '3.2', '3.3']
+        ruby-version: ['2.5', '3.0', '3.1', '3.2', '3.3', '3.4', 'head']
 
     steps:
     - uses: actions/checkout@v4
diff --git a/spec/abrt_spec.rb b/spec/abrt_spec.rb
index cd8ef41..3133261 100644
--- a/spec/abrt_spec.rb
+++ b/spec/abrt_spec.rb
@@ -3,7 +3,7 @@
 describe 'ABRT' do
   context "handles exception in 'abrt.rb' with RubyGems" do
     abrt_rb = File.join(File.dirname(__FILE__), '../lib/abrt.rb')
-    output_message_pattern = /\A#{abrt_rb}:\d+:in `<main>': can't modify frozen Array(: \[1, 2, 3\])? \((FrozenError|RuntimeError)\)\n\Z/
+    output_message_pattern = /\A#{abrt_rb}:\d+:in [`']<main>': can't modify frozen Array(: \[1, 2, 3\])? \((FrozenError|RuntimeError)\)\n\Z/
 
     it 'disabled' do
       expect { system "ruby --disable-gems #{abrt_rb}" }