diff --git a/Gemfile.lock b/Gemfile.lock
index b20db69..e5ae5dc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,8 +8,8 @@ GIT
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.6.0)
-      public_suffix (>= 2.0.2, < 4.0)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     bcrypt (3.1.12)
     bcrypt-ruby (3.1.5)
       bcrypt (>= 3.1.3)
@@ -74,7 +74,7 @@ GEM
     mono_logger (1.1.0)
     multi_json (1.13.1)
     mustermann (1.0.3)
-    public_suffix (3.0.3)
+    public_suffix (5.0.0)
     puma (3.12.1)
     rack (2.0.6)
     rack-protection (2.0.5)