diff --git a/Gemfile.lock b/Gemfile.lock
index 197ecd5..6640197 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,7 +8,9 @@ GEM
     em-websocket (0.5.1)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
+    eventmachine (1.2.7)
     eventmachine (1.2.7-x64-mingw32)
+    ffi (1.9.25)
     ffi (1.9.25-x64-mingw32)
     forwardable-extended (2.6.0)
     http_parser.rb (0.6.0)
@@ -60,14 +62,13 @@ GEM
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    thread_safe (0.3.6)
-    tzinfo (1.2.5)
-      thread_safe (~> 0.1)
+    tzinfo (2.0.5)
+      concurrent-ruby (~> 1.0)
     tzinfo-data (1.2019.5)
       tzinfo (>= 1.0.0)
-    wdm (0.1.1)
 
 PLATFORMS
+  ruby
   x64-mingw32
 
 DEPENDENCIES
@@ -76,7 +77,6 @@ DEPENDENCIES
   jekyll-watch (~> 2.0.0)
   minima (~> 2.0)
   tzinfo-data
-  wdm (~> 0.1.0)
 
 BUNDLED WITH
    1.16.5