diff --git a/ruby/Gemfile.lock b/ruby/Gemfile.lock
index a03c4ed3..38884bc7 100644
--- a/ruby/Gemfile.lock
+++ b/ruby/Gemfile.lock
@@ -46,7 +46,7 @@ GEM
       ruby-progressbar
     mocha (3.1.0)
       ruby2_keywords (>= 0.0.5)
-    msgpack (1.8.0)
+    msgpack (1.8.5)
     parallel (1.27.0)
     parser (3.3.10.2)
       ast (~> 2.4.1)