diff --git a/Gemfile.lock b/Gemfile.lock
index d1870839826..63fc3d35277 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -601,7 +601,7 @@ DEPENDENCIES
   jruby-openssl
   json_spec
   launchy (~> 2.3.0)
-  letter_opener (~> 1.3.0)
+  letter_opener
   multi_json (~> 1.11.0)
   mysql2 (~> 0.3.20)
   net-ldap (~> 0.8.0)