diff --git a/backend/Gemfile.lock b/backend/Gemfile.lock
index 3d5bc0f61..b65df05b7 100644
--- a/backend/Gemfile.lock
+++ b/backend/Gemfile.lock
@@ -71,7 +71,7 @@ GEM
     bcrypt (3.1.11-x86-mingw32)
     brakeman (4.9.1)
     builder (3.2.3)
-    cancancan (2.3.0)
+    cancancan (3.2.1)
     capistrano (3.14.1)
       airbrussh (>= 1.0.0)
       i18n