diff --git a/Gemfile.lock b/Gemfile.lock
index 0971e9e948..e6fc04b5ca 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -137,9 +137,9 @@ GEM
       faraday (~> 0.9)
       faraday_middleware (~> 0.10)
       nokogiri (~> 1.6, >= 1.6.8)
-    backburner (1.4.1)
+    backburner (1.5.0)
       beaneater (~> 1.0)
-      concurrent-ruby (~> 1.0.1)
+      concurrent-ruby (~> 1.0, >= 1.0.1)
       dante (> 0.1.5)
     bcrypt (3.1.12)
     bcrypt (3.1.12-java)