diff --git a/src/auth/oauth/password.ts b/src/auth/oauth/password.ts
index dfd2bbf..762f545 100644
--- a/src/auth/oauth/password.ts
+++ b/src/auth/oauth/password.ts
@@ -33,7 +33,9 @@ export class OAuth2PasswordAuth implements Auth {
         }
 
         // Append the access token to the original request.
-        const authData = await authResponse.json();
+        const authData = (await authResponse.json()) as {
+            access_token: string | undefined;
+        };
         const token = authData["access_token"];
 
         if (!token) {
diff --git a/src/util/headers.ts b/src/util/headers.ts
index 880a57a..23fddd1 100644
--- a/src/util/headers.ts
+++ b/src/util/headers.ts
@@ -14,5 +14,5 @@ export function parseHeaders(headers: string[]): Headers {
         }
         result.append(key.trim(), value.trim());
     });
-    return result;
+    return result as Headers; // Weird bug?
 }