diff --git a/group-by/bundler-standalone/Gemfile b/group-by/bundler-standalone/Gemfile
index 6b66fe6..253586d 100644
--- a/group-by/bundler-standalone/Gemfile
+++ b/group-by/bundler-standalone/Gemfile
@@ -13,6 +13,6 @@ gem 'rails', '7.0.4'
 # AWS SDK gems (grouped under "aws*" pattern)
 # Latest: aws-sdk-core 3.241.x, aws-sdk-s3 1.213.x, aws-partitions 1.1211.x
 # Using older but compatible versions
-gem 'aws-sdk-core', '3.203.0'
+gem 'aws-sdk-core', '3.209.1'
 gem 'aws-sdk-s3', '1.160.0'
 gem 'aws-partitions', '1.950.0'
diff --git a/group-by/bundler-standalone/Gemfile.lock b/group-by/bundler-standalone/Gemfile.lock
index b29de32..bdb6965 100644
--- a/group-by/bundler-standalone/Gemfile.lock
+++ b/group-by/bundler-standalone/Gemfile.lock
@@ -68,7 +68,7 @@ GEM
       tzinfo (~> 2.0)
     aws-eventstream (1.4.0)
     aws-partitions (1.950.0)
-    aws-sdk-core (3.203.0)
+    aws-sdk-core (3.209.1)
       aws-eventstream (~> 1, >= 1.3.0)
       aws-partitions (~> 1, >= 1.651.0)
       aws-sigv4 (~> 1.9)
@@ -190,7 +190,7 @@ PLATFORMS
 
 DEPENDENCIES
   aws-partitions (= 1.950.0)
-  aws-sdk-core (= 3.203.0)
+  aws-sdk-core (= 3.209.1)
   aws-sdk-s3 (= 1.160.0)
   rails (= 7.0.4)