diff --git a/backend/Gemfile.lock b/backend/Gemfile.lock
index 3866b9c..f07bc94 100644
--- a/backend/Gemfile.lock
+++ b/backend/Gemfile.lock
@@ -90,7 +90,7 @@ GEM
       racc
     builder (3.3.0)
     chartkick (5.2.1)
-    concurrent-ruby (1.3.6)
+    concurrent-ruby (1.3.7)
     connection_pool (2.5.5)
     crass (1.0.6)
     csv (3.3.5)
@@ -342,7 +342,7 @@ CHECKSUMS
   brakeman (8.0.5) sha256=03735f9690d3fd4b32d66aacbf0a6d15a84266bdd06b32c05c8ecc8f6021d2be
   builder (3.3.0) sha256=497918d2f9dca528fdca4b88d84e4ef4387256d984b8154e9d5d3fe5a9c8835f
   chartkick (5.2.1) sha256=2848d7de87189f30f28d077eb0bbdebc8a1f0f6f81de1ded95008fe564369949
-  concurrent-ruby (1.3.6) sha256=6b56837e1e7e5292f9864f34b69c5a2cbc75c0cf5338f1ce9903d10fa762d5ab
+  concurrent-ruby (1.3.7) sha256=4412caec3a5ea2e5fdc52076724c071a81f2c0593d83b2ac8cbb8ca63b3151b0
   connection_pool (2.5.5) sha256=e54ff92855753df1fd7c59fa04a398833355f27dd14c074f8c83a05f72a716ad
   crass (1.0.6) sha256=dc516022a56e7b3b156099abc81b6d2b08ea1ed12676ac7a5657617f012bd45d
   csv (3.3.5) sha256=6e5134ac3383ef728b7f02725d9872934f523cb40b961479f69cf3afa6c8e73f