diff --git a/Gemfile.lock b/Gemfile.lock
index b3c5ae5..28a2898 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -18,8 +18,8 @@ GEM
     execjs (2.7.0)
     faraday (0.9.2)
       multipart-post (>= 1.2, < 3)
-    ffi (1.9.14)
-    ffi (1.9.14-x64-mingw32)
+    ffi (1.13.1)
+    ffi (1.13.1-x64-mingw32)
     forwardable-extended (2.6.0)
     gemoji (2.1.0)
     github-pages (96)
@@ -132,7 +132,6 @@ GEM
     tzinfo (1.2.2)
       thread_safe (~> 0.1)
     unicode-display_width (1.1.1)
-    wdm (0.1.1)
 
 PLATFORMS
   ruby
@@ -141,7 +140,6 @@ PLATFORMS
 DEPENDENCIES
   github-pages
   jekyll-feed
-  wdm (~> 0.1.0)
 
 BUNDLED WITH
    1.12.5