diff --git a/aws-sdk-1.5.4/services/dynamodb.class.php b/aws-sdk-1.5.4/services/dynamodb.class.php
index cf43ec2..a408e9f 100644
--- a/aws-sdk-1.5.4/services/dynamodb.class.php
+++ b/aws-sdk-1.5.4/services/dynamodb.class.php
@@ -240,7 +240,14 @@ class AmazonDynamoDB extends CFRuntime
                        throw new DynamoDB_Exception('The DynamoDB class requires the "default_cache_config" configuration to be set in the config.inc.php file.');
                        // @codeCoverageIgnoreEnd
                }
-
+
+               $this->refresh_sts_credentials_options = $options;
+               $this->refresh_sts_credentials();
+       }
+
+       function refresh_sts_credentials() {
+               $options = $this->refresh_sts_credentials_options;
+
                // Configure cache
                $this->set_cache_config($this->credentials->default_cache_config);
                $cache_id = $this->key . '_sts_credentials_' . sha1(serialize($options));