diff --git a/Gemfile.lock b/Gemfile.lock
index 1b5dc3e902..dbbace5b23 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -3,7 +3,8 @@ GEM
   specs:
     addressable (2.4.0)
     colorator (0.1)
-    ffi (1.9.14-x64-mingw32)
+    ffi (1.9.18)
+    ffi (1.9.18-x64-mingw32)
     jekyll (3.1.6)
       colorator (~> 0.1)
       jekyll-sass-converter (~> 1.0)
@@ -13,26 +14,31 @@ GEM
       mercenary (~> 0.3.3)
       rouge (~> 1.7)
       safe_yaml (~> 1.0)
-    jekyll-sass-converter (1.4.0)
+    jekyll-sass-converter (1.5.0)
       sass (~> 3.4)
     jekyll-sitemap (0.11.0)
       addressable (~> 2.4.0)
-    jekyll-watch (1.4.0)
+    jekyll-watch (1.5.0)
       listen (~> 3.0, < 3.1)
-    kramdown (1.11.1)
+    kramdown (1.14.0)
     liquid (3.0.6)
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
     mercenary (0.3.6)
-    rb-fsevent (0.9.7)
-    rb-inotify (0.9.7)
-      ffi (>= 0.5.0)
+    rb-fsevent (0.10.2)
+    rb-inotify (0.9.10)
+      ffi (>= 0.5.0, < 2)
     rouge (1.11.1)
     safe_yaml (1.0.4)
-    sass (3.4.22)
+    sass (3.5.1)
+      sass-listen (~> 4.0.0)
+    sass-listen (4.0.0)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
 
 PLATFORMS
+  ruby
   x64-mingw32
 
 DEPENDENCIES
@@ -40,4 +46,4 @@ DEPENDENCIES
   jekyll-sitemap (~> 0.11.0)
 
 BUNDLED WITH
-   1.12.5
+   1.15.3