diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index c38bc520..c1678064 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -67,7 +67,8 @@ GEM
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.5)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rouge (3.21.0)
     safe_yaml (1.0.5)
     sass (3.7.4)
@@ -75,6 +76,7 @@ GEM
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
+    strscan (3.1.0)
     thread_safe (0.3.6)
     tzinfo (1.2.10)
       thread_safe (~> 0.1)