diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ee3aff6..8cff53d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,6 +13,7 @@ jobs:
           - '3.1'
           - '3.2'
           - '3.3'
+          - '3.4'
     steps:
       - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
diff --git a/Gemfile.lock b/Gemfile.lock
index 8955e1b..5fa8d7c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -26,13 +26,13 @@ GEM
       rb-inotify (>= 0.9)
       rb-kqueue (>= 0.2)
     lumberjack (1.2.10)
-    maxitest (5.4.0)
-      minitest (>= 5.14.0, < 5.21.0)
+    maxitest (5.8.0)
+      minitest (>= 5.14.0, < 5.26.0)
     method_source (1.0.0)
     mime-types (3.5.2)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2023.1205)
-    minitest (5.20.0)
+    minitest (5.25.4)
     pry (0.14.2)
       coderay (~> 1.1)
       method_source (~> 1.0)