diff --git a/Gemfile.lock b/Gemfile.lock
index a15b1d28..9e58b7b9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -9,8 +9,8 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.5.2)
-      public_suffix (>= 2.0.2, < 4.0)
+    addressable (2.8.0)
+      public_suffix (>= 2.0.2, < 5.0)
     colorator (1.1.0)
     concurrent-ruby (1.0.5)
     em-websocket (0.5.1)
@@ -54,7 +54,7 @@ GEM
     mercenary (0.3.6)
     pathutil (0.16.1)
       forwardable-extended (~> 2.6)
-    public_suffix (3.0.3)
+    public_suffix (4.0.6)
     rake (10.5.0)
     rb-fsevent (0.10.3)
     rb-inotify (0.9.10)
@@ -67,7 +67,6 @@ GEM
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    wdm (0.1.1)
 
 PLATFORMS
   ruby
@@ -77,7 +76,6 @@ DEPENDENCIES
   bundler (~> 1.12)
   jekyll-theme-type!
   rake (~> 10.0)
-  wdm (>= 0.1.0)
 
 BUNDLED WITH
    1.16.4