diff --git a/Gemfile.lock b/Gemfile.lock
index d5dd62d..5213a0b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -7,6 +7,7 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
+    cool.io (1.5.3)
     cool.io (1.5.3-x64-mingw32)
     dig_rb (1.0.1)
     fluentd (1.1.0)
@@ -21,6 +22,7 @@ GEM
       tzinfo-data (~> 1.0)
       yajl-ruby (~> 1.0)
     http_parser.rb (0.6.0)
+    msgpack (1.2.2)
     msgpack (1.2.2-x64-mingw32)
     serverengine (2.0.6)
       sigdump (~> 0.2.2)
@@ -31,9 +33,10 @@ GEM
       thread_safe (~> 0.1)
     tzinfo-data (1.2018.3)
       tzinfo (>= 1.0.0)
-    yajl-ruby (1.3.1)
+    yajl-ruby (1.4.2)
 
 PLATFORMS
+  ruby
   x64-mingw32
 
 DEPENDENCIES