diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 835359e..3c7d3d1 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -11,7 +11,7 @@ jobs:
   test:
     strategy:
       matrix:
-        ruby_version: [2.5, 2.6, 2.7]
+        ruby_version: [2.6, 2.7]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
diff --git a/Gemfile.lock b/Gemfile.lock
index ed08a2d..64207df 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -12,8 +12,8 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.7.0)
-      public_suffix (>= 2.0.2, < 5.0)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     coderay (1.1.1)
     diff-lcs (1.3)
     docile (1.4.0)
@@ -55,7 +55,7 @@ GEM
     netrc (0.11.0)
     newrelic_rpm (7.1.0)
     prometheus-client (2.1.0)
-    public_suffix (4.0.6)
+    public_suffix (5.0.0)
     rake (13.0.1)
     recursive-open-struct (1.1.3)
     rest-client (2.1.0)