diff --git a/freqtrade/resolvers/iresolver.py b/freqtrade/resolvers/iresolver.py
index 5172e6fda..5b6977b4b 100644
--- a/freqtrade/resolvers/iresolver.py
+++ b/freqtrade/resolvers/iresolver.py
@@ -58,6 +58,9 @@ class IResolver:
         # Generate spec based on absolute path
         # Pass object_name as first argument to have logging print a reasonable name.
         spec = importlib.util.spec_from_file_location(object_name or "", str(module_path))
+        if not spec:
+            return iter([None])
+
         module = importlib.util.module_from_spec(spec)
         try:
             spec.loader.exec_module(module)  # type: ignore # importlib does not use typehints
diff --git a/freqtrade/rpc/webhook.py b/freqtrade/rpc/webhook.py
index 0e4a4bf6f..b4c55649e 100644
--- a/freqtrade/rpc/webhook.py
+++ b/freqtrade/rpc/webhook.py
@@ -77,14 +77,13 @@ class Webhook(RPCHandler):
     def _send_msg(self, payload: dict) -> None:
         """do the actual call to the webhook"""
 
-        if self._format == 'form':
-            kwargs = {'data': payload}
-        elif self._format == 'json':
-            kwargs = {'json': payload}
-        else:
-            raise NotImplementedError('Unknown format: {}'.format(self._format))
-
         try:
-            post(self._url, **kwargs)
+            if self._format == 'form':
+                post(self._url, data=payload)
+            elif self._format == 'json':
+                post(self._url, json=payload)
+            else:
+                raise NotImplementedError('Unknown format: {}'.format(self._format))
+
         except RequestException as exc:
             logger.warning("Could not call webhook url. Exception: %s", exc)
diff --git a/requirements-dev.txt b/requirements-dev.txt
index b0f970224..924b35e1a 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -17,3 +17,9 @@ isort==5.8.0
 
 # Convert jupyter notebooks to markdown documents
 nbconvert==6.0.7
+
+# mypy types
+types-cachetools==0.1.7
+types-filelock==0.1.3
+types-requests==0.1.11
+types-tabulate==0.1.0