diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 018aab1..6e5ab88 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,8 +12,9 @@ jobs:
     strategy:
       matrix:
         ruby:
-          - 3.3
-          - 3.4
+          - '3.3'
+          - '3.4'
+          - '4.0'
     env:
       BUNDLE_GEMFILE: Gemfile
     name: "Test and lint: Ruby ${{ matrix.ruby }}"
diff --git a/spec/support/fixtures.rb b/spec/support/fixtures.rb
index 3d695ed..984af47 100644
--- a/spec/support/fixtures.rb
+++ b/spec/support/fixtures.rb
@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require "pathname"
-
 module Spec
   module Support
     module Fixtures