diff --git a/Gemfile.lock b/Gemfile.lock
index abb667595..7c1bc1dd7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -130,7 +130,8 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    commonmarker (0.23.10)
+    commonmarker (1.1.5)
+      rb_sys (~> 0.9)
     concurrent-ruby (1.3.3)
     crass (1.0.6)
     css_parser (1.14.0)
@@ -355,6 +356,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
+    rb_sys (0.9.100)
     regexp_parser (2.9.2)
     rexml (3.3.1)
       strscan