diff --git a/Gemfile.lock b/Gemfile.lock
index 2b1aca7f4..709c20eb2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -70,7 +70,7 @@ GEM
     power_assert (2.0.3)
     psych (4.0.6)
       stringio
-    public_suffix (5.1.0)
+    public_suffix (5.1.1)
     raap (0.8.0)
       rbs (~> 3.0)
       timeout (~> 0.4)