diff --git a/Gemfile.lock b/Gemfile.lock
index 381459ba399..bb188f0100c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -5,7 +5,7 @@ GEM
       public_suffix (>= 2.0.2, < 5.0)
     chunky_png (1.3.11)
     colorator (1.1.0)
-    commonmarker (0.20.1)
+    commonmarker (0.21.0)
       ruby-enum (~> 0.5)
     compass (1.0.3)
       chunky_png (~> 1.2)
@@ -19,7 +19,7 @@ GEM
       sass (>= 3.3.0, < 3.5)
     compass-import-once (1.0.5)
       sass (>= 3.2, < 3.5)
-    concurrent-ruby (1.1.5)
+    concurrent-ruby (1.1.6)
     em-websocket (0.5.1)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)