diff --git a/Gemfile.lock b/Gemfile.lock
index 8abfc4d..bc48b2a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -17,8 +17,8 @@ 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)
     bibtex-ruby (6.0.0)
       latex-decode (~> 0.0)
     charlock_holmes (0.7.7)
@@ -61,7 +61,7 @@ GEM
     pry (0.13.1)
       coderay (~> 1.1)
       method_source (~> 1.0)
-    public_suffix (4.0.6)
+    public_suffix (5.0.0)
     rake (10.5.0)
     redcarpet (3.5.1)
     rest-client (2.1.0)