diff --git a/Gemfile.lock b/Gemfile.lock
index 183f9cd4..2c2608d8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -4,8 +4,8 @@ GEM
     activesupport (3.2.22.5)
       i18n (~> 0.6, >= 0.6.4)
       multi_json (~> 1.0)
-    addressable (2.7.0)
-      public_suffix (>= 2.0.2, < 5.0)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
@@ -225,7 +225,7 @@ GEM
       sawyer (~> 0.8.0, >= 0.5.3)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
-    public_suffix (4.0.6)
+    public_suffix (4.0.7)
     racc (1.5.2)
     rake (13.0.3)
     rb-fsevent (0.10.4)
@@ -261,7 +261,6 @@ GEM
     unf_ext (0.0.7.7)
     unf_ext (0.0.7.7-x64-mingw32)
     unicode-display_width (1.7.0)
-    wdm (0.1.1)
     webrick (1.7.0)
 
 PLATFORMS
@@ -273,7 +272,6 @@ DEPENDENCIES
   jekyll-feed (~> 0.6)
   just-the-docs (~> 0.3.0)
   tzinfo-data
-  wdm (~> 0.1.0)
   webrick (~> 1.7)
 
 BUNDLED WITH