diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3b76df232..dbb0e4d62 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -62,6 +62,8 @@ jobs:
           python-version: '3.8'
       - name: Install pyright
         run: npm install -g pyright
+      - name: Show pyright version
+        run: pyright --version
       - name: Install dependencies
         run: sudo pip install -U wheel pipenv && pipenv install --dev
       - name: Lint with pyright
diff --git a/passbook/sources/oauth/clients.py b/passbook/sources/oauth/clients.py
index 06a9310fc..35c58d7ba 100644
--- a/passbook/sources/oauth/clients.py
+++ b/passbook/sources/oauth/clients.py
@@ -1,6 +1,6 @@
 """OAuth Clients"""
 import json
-from typing import Dict, Optional
+from typing import TYPE_CHECKING, Any, Dict, Optional
 from urllib.parse import parse_qs, urlencode
 
 from django.http import HttpRequest
@@ -14,24 +14,29 @@ from structlog import get_logger
 from passbook import __version__
 
 LOGGER = get_logger()
+if TYPE_CHECKING:
+    from passbook.sources.oauth.models import OAuthSource
 
 
 class BaseOAuthClient:
     """Base OAuth Client"""
 
     session: Session
+    source: "OAuthSource"
 
-    def __init__(self, source, token=""):  # nosec
+    def __init__(self, source: "OAuthSource", token=""):  # nosec
         self.source = source
         self.token = token
         self.session = Session()
         self.session.headers.update({"User-Agent": "passbook %s" % __version__})
 
-    def get_access_token(self, request, callback=None):
+    def get_access_token(
+        self, request: HttpRequest, callback=None
+    ) -> Optional[Dict[str, Any]]:
         "Fetch access token from callback request."
         raise NotImplementedError("Defined in a sub-class")  # pragma: no cover
 
-    def get_profile_info(self, token: Dict[str, str]):
+    def get_profile_info(self, token: Dict[str, str]) -> Optional[Dict[str, Any]]:
         "Fetch user profile information."
         try:
             headers = {
@@ -45,7 +50,7 @@ class BaseOAuthClient:
             LOGGER.warning("Unable to fetch user profile", exc=exc)
             return None
         else:
-            return response.json() or response.text
+            return response.json()
 
     def get_redirect_args(self, request, callback) -> Dict[str, str]:
         "Get request parameters for redirect url."
diff --git a/passbook/sources/oauth/views/core.py b/passbook/sources/oauth/views/core.py
index 7e3249bc7..9166ad3b6 100644
--- a/passbook/sources/oauth/views/core.py
+++ b/passbook/sources/oauth/views/core.py
@@ -21,7 +21,7 @@ from passbook.flows.planner import (
 )
 from passbook.flows.views import SESSION_KEY_PLAN
 from passbook.lib.utils.urls import redirect_with_qs
-from passbook.sources.oauth.clients import get_client
+from passbook.sources.oauth.clients import BaseOAuthClient, get_client
 from passbook.sources.oauth.models import OAuthSource, UserOAuthSourceConnection
 from passbook.stages.password.stage import PLAN_CONTEXT_AUTHENTICATION_BACKEND
 
@@ -34,7 +34,7 @@ class OAuthClientMixin:
 
     client_class: Optional[Callable] = None
 
-    def get_client(self, source):
+    def get_client(self, source: OAuthSource) -> BaseOAuthClient:
         "Get instance of the OAuth client for this source."
         if self.client_class is not None:
             # pylint: disable=not-callable