diff --git a/Gemfile.lock b/Gemfile.lock
index bb078e26..dc62e79d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,8 +1,8 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.5.1)
-      public_suffix (~> 2.0, >= 2.0.2)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     asciidoctor (1.5.6.1)
     coderay (1.1.2)
     colorator (1.1.0)
@@ -35,7 +35,7 @@ GEM
     multi_json (1.12.2)
     pathutil (0.14.0)
       forwardable-extended (~> 2.6)
-    public_suffix (2.0.5)
+    public_suffix (5.0.0)
     pygments.rb (1.2.0)
       multi_json (>= 1.0.0)
     rb-fsevent (0.9.8)