diff --git a/app_backend/Gemfile.lock b/app_backend/Gemfile.lock
index ffd62ac..d507fdf 100644
--- a/app_backend/Gemfile.lock
+++ b/app_backend/Gemfile.lock
@@ -16,7 +16,7 @@ GEM
     http-cookie (1.0.3)
       domain_name (~> 0.5)
     jaro_winkler (1.5.2)
-    json (2.2.0)
+    json (2.3.1)
     method_source (0.9.2)
     mime-types (3.2.2)
       mime-types-data (~> 3.2015)