diff --git a/Gemfile.lock b/Gemfile.lock
index e1d970cc..0867fa59 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -75,7 +75,8 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.5)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rouge (3.30.0)
     safe_yaml (1.0.5)
     sass (3.7.4)
@@ -83,6 +84,7 @@ GEM
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
+    strscan (3.1.0)
     typhoeus (1.4.0)
       ethon (>= 0.9.0)
     uswds-jekyll (1.4.1)