diff --git a/Gemfile.lock b/Gemfile.lock
index 49f7c93..221eb60 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,8 +1,8 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.8.0)
-      public_suffix (>= 2.0.2, < 5.0)
+    addressable (2.9.0)
+      public_suffix (>= 2.0.2, < 8.0)
     base64 (0.3.0)
     coveralls_reborn (0.24.0)
       simplecov (>= 0.18.1, < 0.22.0)
@@ -19,7 +19,7 @@ GEM
     mustermann (3.0.4)
       ruby2_keywords (~> 0.0.1)
     nio4r (2.7.3)
-    public_suffix (4.0.6)
+    public_suffix (7.0.5)
     puma (6.4.3)
       nio4r (~> 2.0)
     rack (3.2.6)