diff --git a/jwt/api_jws.py b/jwt/api_jws.py
index f85072e0..9e8e1787 100644
--- a/jwt/api_jws.py
+++ b/jwt/api_jws.py
@@ -132,8 +132,8 @@ def decode_complete(
         self,
         jwt: str,
         key: str = "",
-        algorithms: List[str] = None,
-        options: Dict = None,
+        algorithms: Optional[List[str]] = None,
+        options: Optional[Dict] = None,
         **kwargs,
     ) -> Dict[str, Any]:
         if options is None:
@@ -161,8 +161,8 @@ def decode(
         self,
         jwt: str,
         key: str = "",
-        algorithms: List[str] = None,
-        options: Dict = None,
+        algorithms: Optional[List[str]] = None,
+        options: Optional[Dict] = None,
         **kwargs,
     ) -> str:
         decoded = self.decode_complete(jwt, key, algorithms, options, **kwargs)
diff --git a/jwt/api_jwt.py b/jwt/api_jwt.py
index f3b55d36..c9d34a5f 100644
--- a/jwt/api_jwt.py
+++ b/jwt/api_jwt.py
@@ -66,8 +66,8 @@ def decode_complete(
         self,
         jwt: str,
         key: str = "",
-        algorithms: List[str] = None,
-        options: Dict = None,
+        algorithms: Optional[List[str]] = None,
+        options: Optional[Dict] = None,
         **kwargs,
     ) -> Dict[str, Any]:
         if options is None:
@@ -112,8 +112,8 @@ def decode(
         self,
         jwt: str,
         key: str = "",
-        algorithms: List[str] = None,
-        options: Dict = None,
+        algorithms: Optional[List[str]] = None,
+        options: Optional[Dict] = None,
         **kwargs,
     ) -> Dict[str, Any]:
         decoded = self.decode_complete(jwt, key, algorithms, options, **kwargs)
diff --git a/setup.cfg b/setup.cfg
index 62798cb9..5e0b244c 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -71,3 +71,4 @@ extend-ignore = E203, E501
 python_version = 3.6
 ignore_missing_imports = true
 warn_unused_ignores = true
+no_implicit_optional = true