diff --git a/Gemfile.lock b/Gemfile.lock
index ff45f4a1a..fe8e72cde 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -94,7 +94,8 @@ GEM
     mocha (2.7.1)
       ruby2_keywords (>= 0.0.5)
     mutex_m (0.3.0)
-    mysql2 (0.5.6)
+    mysql2 (0.5.7)
+      bigdecimal
     parallel (1.27.0)
     parser (3.3.9.0)
       ast (~> 2.4.1)