diff --git a/test_app/Gemfile.lock b/test_app/Gemfile.lock
index e3f736c..45256c2 100644
--- a/test_app/Gemfile.lock
+++ b/test_app/Gemfile.lock
@@ -222,7 +222,8 @@ GEM
     regexp_parser (2.2.0)
     reline (0.5.7)
       io-console (~> 0.5)
-    rexml (3.2.5)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     ruby-vips (2.2.0)
       ffi (~> 1.12)
     rubyzip (2.3.2)
@@ -252,6 +253,7 @@ GEM
     sqlite3 (1.7.3-x86_64-darwin)
     sqlite3 (1.7.3-x86_64-linux)
     stringio (3.1.0)
+    strscan (3.1.0)
     thor (1.3.1)
     tilt (2.3.0)
     timeout (0.4.1)