diff --git a/Gemfile.lock b/Gemfile.lock
index bd80dea2a..df064fc59 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -232,7 +232,7 @@ GEM
     rb-fsevent (0.11.0)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.5)
+    rexml (3.4.2)
     rouge (3.26.0)
     ruby-enum (0.9.0)
       i18n
@@ -262,7 +262,6 @@ 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)
 
 PLATFORMS
   ruby
@@ -274,7 +273,6 @@ DEPENDENCIES
   jekyll-include-cache
   minima (~> 2.0)
   tzinfo-data
-  wdm (~> 0.1.0)
 
 BUNDLED WITH
    2.0.2