diff --git a/Gemfile.lock b/Gemfile.lock
index 055fa74..a2133f5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -90,7 +90,7 @@ GEM
     builder (3.2.4)
     concurrent-ruby (1.2.3)
     connection_pool (2.4.1)
-    crack (0.4.6)
+    crack (1.0.0)
       bigdecimal
       rexml
     crass (1.0.6)