diff --git a/Gemfile.lock b/Gemfile.lock
index 1559fd536..88ac0d13f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -39,7 +39,8 @@ GEM
       tzinfo (~> 1.1)
     acts-as-taggable-on (3.5.0)
       activerecord (>= 3.2, < 5)
-    addressable (2.3.8)
+    addressable (2.8.0)
+      public_suffix (>= 2.0.2, < 5.0)
     arel (6.0.3)
     builder (3.2.2)
     capybara (2.5.0)
@@ -125,6 +126,7 @@ GEM
     omniauth-openid (1.0.1)
       omniauth (~> 1.0)
       rack-openid (~> 1.3.1)
+    public_suffix (4.0.6)
     rack (1.6.4)
     rack-openid (1.3.1)
       rack (>= 1.1.0)