diff --git a/Gemfile.lock b/Gemfile.lock
index 7b05b3b..e68c0fd 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -12,7 +12,9 @@ GEM
       json_pure (~> 2.0)
       kramdown (~> 2.3.0)
       kramdown-parser-gfm (~> 1.1)
-    rexml (3.2.5)
+    rexml (3.3.3)
+      strscan
+    strscan (3.1.0)
 
 PLATFORMS
   ruby