diff --git a/backend-server/Gemfile b/backend-server/Gemfile
index ef4bfed..48788a8 100644
--- a/backend-server/Gemfile
+++ b/backend-server/Gemfile
@@ -11,7 +11,7 @@ gem 'rack', '>= 3.2.6'
 gem 'rack-session', '>= 2.1.2'
 
 # Data & Serialization
-gem 'json', '~> 2.19', '>= 2.19.2'
+gem 'json', '~> 2.21'
 gem 'csv', '~> 3.2'
 gem 'pg', '~> 1.5', require: 'pg'
 gem 'redis', '~> 5.2'
diff --git a/backend-server/Gemfile.lock b/backend-server/Gemfile.lock
index bfef740..5e7914d 100644
--- a/backend-server/Gemfile.lock
+++ b/backend-server/Gemfile.lock
@@ -11,7 +11,7 @@ GEM
     ffi (1.17.3-x64-mingw-ucrt)
     ffi (1.17.3-x86_64-linux-gnu)
     io-console (0.8.2)
-    json (2.19.5)
+    json (2.21.1)
     language_server-protocol (3.17.0.5)
     logger (1.7.0)
     method_source (1.1.0)
@@ -86,7 +86,7 @@ DEPENDENCIES
   csv (~> 3.2)
   dotenv (~> 2.8)
   ffi (~> 1.15)
-  json (~> 2.19, >= 2.19.2)
+  json (~> 2.21)
   minitest (~> 5.18)
   mocha (~> 2.0)
   pg (~> 1.5)
@@ -113,7 +113,7 @@ CHECKSUMS
   ffi (1.17.3-x64-mingw-ucrt) sha256=5f1d7d067a9a1058ad183dba25b05557cd51c85fc1768c49338eabc1cf242d7c
   ffi (1.17.3-x86_64-linux-gnu) sha256=3746b01f677aae7b16dc1acb7cb3cc17b3e35bdae7676a3f568153fb0e2c887f
   io-console (0.8.2) sha256=d6e3ae7a7cc7574f4b8893b4fca2162e57a825b223a177b7afa236c5ef9814cc
-  json (2.19.5) sha256=218a18553e4801d579ca7e0f5bc72bafd776d7397238a1fb4e74db5b0a812c59
+  json (2.21.1) sha256=13a43df75d95641443f5702dff350f237164a9d811ff0f2c2800d4d980220583
   language_server-protocol (3.17.0.5) sha256=fd1e39a51a28bf3eec959379985a72e296e9f9acfce46f6a79d31ca8760803cc
   logger (1.7.0) sha256=196edec7cc44b66cfb40f9755ce11b392f21f7967696af15d274dde7edff0203
   method_source (1.1.0) sha256=181301c9c45b731b4769bc81e8860e72f9161ad7d66dd99103c9ab84f560f5c5