diff --git a/Gemfile.lock b/Gemfile.lock
index b457e34..49b8143 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -234,7 +234,7 @@ GEM
       prism (~> 1.5)
     mocha (3.1.0)
       ruby2_keywords (>= 0.0.5)
-    msgpack (1.8.4)
+    msgpack (1.8.7)
     net-http (0.9.1)
       uri (>= 0.11.1)
     net-imap (0.6.6)