diff --git a/Gemfile.lock b/Gemfile.lock
index da70957..b00c848 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -27,7 +27,7 @@ GEM
       racc
     cgi (0.5.1)
     concurrent-ruby (1.3.5)
-    connection_pool (2.5.3)
+    connection_pool (2.5.5)
     csv (3.3.5)
     date (3.5.1)
     diff-lcs (1.6.2)