diff --git a/Gemfile.lock b/Gemfile.lock
index 1a50566..c1e3115 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -194,7 +194,7 @@ GEM
       method_source (~> 0.9.0)
     pry-rails (0.3.9)
       pry (>= 0.10.4)
-    public_suffix (3.0.3)
+    public_suffix (3.1.0)
     puma (3.12.1)
     rack (2.0.7)
     rack-livereload (0.3.17)