diff --git a/lua-aws/core.lua b/lua-aws/core.lua
index 530bab3..5209b8d 100644
--- a/lua-aws/core.lua
+++ b/lua-aws/core.lua
@@ -35,6 +35,7 @@ local AWS = class.AWS {
 		self.Firehose = require('lua-aws.services.firehose').new(self)
 		self.Lambda = require('lua-aws.services.lambda').new(self)
 		self.IAM = require('lua-aws.services.iam').new(self)
+		self.STS = require('lua-aws.services.sts').new(self)
   	
 		--[[
 		require('./services/autoscaling')
diff --git a/lua-aws/services/sts.lua b/lua-aws/services/sts.lua
new file mode 100644
index 0000000..123fb6e
--- /dev/null
+++ b/lua-aws/services/sts.lua
@@ -0,0 +1,6 @@
+local class = require ('lua-aws.class')
+local Service = require ('lua-aws.services.base')
+
+return class.AWS_STS.extends(Service) {
+
+}
diff --git a/test/sts.lua b/test/sts.lua
new file mode 100644
index 0000000..a08ffbd
--- /dev/null
+++ b/test/sts.lua
@@ -0,0 +1,20 @@
+local helper = require 'test.helper.util'
+local AWS = require ('lua-aws.init')
+local aws = AWS.new({
+	accessKeyId = os.getenv('AWS_ACCESS_KEY'),
+	secretAccessKey = os.getenv('AWS_SECRET_KEY'),
+	region = 'us-east-1'
+})
+
+local roleName = "lua-aws-test-default-role"
+local roleArn = helper.create_service_role(aws, roleName)
+
+local ok, r = aws.STS:api():assumeRole({
+	RoleArn = roleArn,
+	RoleSessionName = "LuaAwsSTSTestSession"
+})
+
+print(ok, r)
+
+helper.dump = true
+helper.dump_res('assumeRole', r)