diff --git a/api_generator/Gemfile.lock b/api_generator/Gemfile.lock
index c9cbd6029..e40e2e4d7 100644
--- a/api_generator/Gemfile.lock
+++ b/api_generator/Gemfile.lock
@@ -15,7 +15,7 @@ GEM
     ast (2.4.2)
     base64 (0.2.0)
     bigdecimal (3.1.8)
-    concurrent-ruby (1.3.4)
+    concurrent-ruby (1.3.7)
     connection_pool (2.4.1)
     drb (2.2.1)
     i18n (1.14.6)