diff --git a/stacks/makefile b/stacks/makefile
index d8154e8..12bdb9d 100644
--- a/stacks/makefile
+++ b/stacks/makefile
@@ -20,5 +20,5 @@ venv:
 	. ${VENV_NAME}/Scripts/activate
 	echo "virtualenv prepared, please run 'source ${VENV_NAME}/bin/activate' if you wish to use it in your current shell"
 
-pycodestyle: venv
-	. ${VENV_NAME}/Scripts/activate && pycodestyle --first src/template.py
\ No newline at end of file
+pycodestyle:
+	. ${VENV_NAME}/Scripts/activate && mypy --warn-unused-configs --disallow-any-generics --disallow-subclassing-any --disallow-untyped-calls --disallow-untyped-defs --disallow-incomplete-defs --check-untyped-defs --disallow-untyped-decorators --no-implicit-optional --warn-redundant-casts --warn-unused-ignores --warn-return-any --no-implicit-reexport --strict-equality --ignore-missing-imports --pretty src/*.py && pycodestyle --first src/*.py
\ No newline at end of file
diff --git a/stacks/requirements.txt b/stacks/requirements.txt
index b4976f3..130967f 100644
--- a/stacks/requirements.txt
+++ b/stacks/requirements.txt
@@ -1,4 +1,5 @@
 troposphere==3.0.2
 awacs==2.0.0
-ydiff
+ydiff==1.2
 pycodestyle==2.7.0
+mypy==0.910
diff --git a/stacks/src/template.py b/stacks/src/template.py
index 0ecc571..9082e11 100644
--- a/stacks/src/template.py
+++ b/stacks/src/template.py
@@ -1,18 +1,18 @@
 from troposphere import Template
+from troposphere.sqs import Queue
 
 from util import Util
 
-PROJECT_NAME = "Tweeter"
-S3_QUEUE_NAME = PROJECT_NAME + "S3Queue"
-TWEETER_QUEUE_NAME = PROJECT_NAME + "Queue"
-DYNAMO_DB_QUEUE_NAME = PROJECT_NAME + "DynamoDbQueue"
-SHARED_CONFIG_BUCKET_NAME = PROJECT_NAME + "SharedConfig"
+PROJECT_NAME: str = "Tweeter"
+S3_QUEUE_NAME: str = "S3Queue"
+TWEETER_QUEUE_NAME: str = "TwitterQueue"
+DYNAMO_DB_QUEUE_NAME: str = "DynamoDbQueue"
 
-template = Template(PROJECT_NAME + "Workflow")
-templateUtil = Util(template)
+template: Template = Template(PROJECT_NAME + "Workflow")
+templateUtil: Util = Util(template)
 
-s3_queue = templateUtil.create_queue(S3_QUEUE_NAME)
-tweeter_queue = templateUtil.create_queue(TWEETER_QUEUE_NAME)
-dynamo_db_queue = templateUtil.create_queue(DYNAMO_DB_QUEUE_NAME)
+s3_queue: Queue = templateUtil.create_queue(S3_QUEUE_NAME)
+tweeter_queue: Queue = templateUtil.create_queue(TWEETER_QUEUE_NAME)
+dynamo_db_queue: Queue = templateUtil.create_queue(DYNAMO_DB_QUEUE_NAME)
 
 print(template.to_json())
diff --git a/stacks/src/util.py b/stacks/src/util.py
index f8fe737..8f325d4 100644
--- a/stacks/src/util.py
+++ b/stacks/src/util.py
@@ -1,11 +1,12 @@
+from troposphere import Template
 from troposphere.sqs import Queue
 
 
 class Util:
-    def __init__(self, template):
+    def __init__(self, template: Template) -> None:
         self.template = template
 
-    def create_queue(self, queue_name):
+    def create_queue(self, queue_name: str) -> Queue:
         return self.template.add_resource(
             Queue(
                 queue_name,