diff --git a/Gemfile.lock b/Gemfile.lock
index 8a24cae..9b812fb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -27,7 +27,7 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.12.0)
     rspec-support (3.12.0)
-    tracking_number (1.3.5)
+    tracking_number (1.4.0)
       activesupport (>= 4.2.5)
       json (>= 1.8.3)
     tzinfo (2.0.6)