diff --git a/Gemfile.lock b/Gemfile.lock
index 297dd50..d59574f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -174,7 +174,7 @@ GEM
     multi_json (1.13.1)
     multi_xml (0.6.0)
     multipart-post (2.0.0)
-    mysql2 (0.3.21)
+    mysql2 (0.5.2)
     net-scp (1.2.1)
       net-ssh (>= 2.6.5)
     net-ssh (5.0.1)
@@ -344,7 +344,7 @@ DEPENDENCIES
   jquery-datatables-rails
   jquery-rails
   listen
-  mysql2 (~> 0.3.0)
+  mysql2 (>= 0.4.4, < 0.6.0)
   omniauth-oauth2 (~> 1.3.1)
   purecss-rails
   rails (= 5.2.0)
@@ -361,4 +361,4 @@ DEPENDENCIES
   web-console
 
 BUNDLED WITH
-   1.16.2
+   1.16.3