diff --git a/Gemfile.lock b/Gemfile.lock
index 66afa2d..8b6970b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,8 +2,8 @@ GEM
   remote: http://rubygems.org/
   specs:
     Ascii85 (1.0.3)
-    addressable (2.7.0)
-      public_suffix (>= 2.0.2, < 5.0)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     afm (0.2.2)
     builder (3.2.3)
     descendants_tracker (0.0.4)
@@ -68,7 +68,7 @@ GEM
       pdf-reader (>= 0.9.0)
       ttfunk (~> 1.0.2)
     psych (3.1.0)
-    public_suffix (4.0.1)
+    public_suffix (5.0.0)
     rack (2.0.8)
     rake (0.9.2.2)
     rb-fchange (0.0.5)