diff --git a/gems/aws-sdk-core/CHANGELOG.md b/gems/aws-sdk-core/CHANGELOG.md
index c12404a9113..d2c7beeafa6 100644
--- a/gems/aws-sdk-core/CHANGELOG.md
+++ b/gems/aws-sdk-core/CHANGELOG.md
@@ -1,6 +1,8 @@
 Unreleased Changes
 ------------------
 
+* Issue - Remove base64 as dependency.
+
 3.191.2 (2024-02-14)
 ------------------
 
@@ -20,7 +22,7 @@ Unreleased Changes
 
 * Feature - Updated Aws::SSO::Client with the latest API changes.
 
-* Feature - Add RBS signature files to support static type checking.
+* Feature - Add RBS signature files to support static type checking
 
 3.190.3 (2024-01-16)
 ------------------
diff --git a/gems/aws-sdk-core/aws-sdk-core.gemspec b/gems/aws-sdk-core/aws-sdk-core.gemspec
index 64b99af8a1f..12f78a41c66 100644
--- a/gems/aws-sdk-core/aws-sdk-core.gemspec
+++ b/gems/aws-sdk-core/aws-sdk-core.gemspec
@@ -16,7 +16,6 @@ Gem::Specification.new do |spec|
   spec.add_dependency('aws-partitions', '~> 1', '>= 1.651.0') # necessary for new endpoint resolution
   spec.add_dependency('aws-sigv4', '~> 1.8') # necessary for s3 express auth
   spec.add_dependency('aws-eventstream', '~> 1', '>= 1.3.0') # necessary for binary eventstream
-  spec.add_dependency('base64') # necessary for base64 encoding/decoding
 
   spec.metadata = {
     'source_code_uri' => 'https://github.com/aws/aws-sdk-ruby/tree/version-3/gems/aws-sdk-core',
diff --git a/services.json b/services.json
index 0301386c90b..06371d83ece 100644
--- a/services.json
+++ b/services.json
@@ -371,19 +371,13 @@
       "Aws::DynamoDB::Plugins::ExtendedRetries",
       "Aws::DynamoDB::Plugins::SimpleAttributes",
       "Aws::DynamoDB::Plugins::CRC32Validation"
-    ],
-    "dependencies": {
-      "bigdecimal": null
-    }
+    ]
   },
   "DynamoDBStreams": {
     "models": "streams.dynamodb/2012-08-10",
     "addPlugins": [
       "Aws::DynamoDBStreams::Plugins::SimpleAttributes"
-    ],
-    "dependencies": {
-      "bigdecimal": null
-    }
+    ]
   },
   "EBS": {
     "models": "ebs/2019-11-02"