diff --git a/Gemfile.lock b/Gemfile.lock
index 799ad41b..613126ca 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -4,8 +4,10 @@ GEM
     addressable (2.5.1)
       public_suffix (~> 2.0, >= 2.0.2)
     colorator (1.1.0)
+    concurrent-ruby (1.1.10)
     faraday (0.13.1)
       multipart-post (>= 1.2, < 3)
+    ffi (1.9.18)
     ffi (1.9.18-x64-mingw32)
     forwardable-extended (2.6.0)
     gemoji (3.0.0)
@@ -56,15 +58,14 @@ GEM
       addressable (>= 2.3.5, < 2.6)
       faraday (~> 0.8, < 1.0)
     temple (0.8.0)
-    thread_safe (0.3.6)
     tilt (2.0.8)
-    tzinfo (1.2.3)
-      thread_safe (~> 0.1)
+    tzinfo (2.0.5)
+      concurrent-ruby (~> 1.0)
     tzinfo-data (1.2017.2)
       tzinfo (>= 1.0.0)
-    wdm (0.1.1)
 
 PLATFORMS
+  ruby
   x64-mingw32
 
 DEPENDENCIES
@@ -73,7 +74,6 @@ DEPENDENCIES
   jekyll-haml
   octokit (~> 4.7)
   tzinfo-data
-  wdm (>= 0.1.0)
 
 BUNDLED WITH
    1.15.3