diff --git a/freqtrade/rpc/api_server/api_schemas.py b/freqtrade/rpc/api_server/api_schemas.py
index 050540cc6..2738e5368 100644
--- a/freqtrade/rpc/api_server/api_schemas.py
+++ b/freqtrade/rpc/api_server/api_schemas.py
@@ -1,5 +1,5 @@
 from datetime import date, datetime
-from typing import Any, Dict, List, Optional, TypeVar, Union
+from typing import Any, Dict, List, Optional, Union
 
 from pydantic import BaseModel
 
@@ -205,7 +205,8 @@ class TradeResponse(BaseModel):
     trades_count: int
 
 
-ForceBuyResponse = TypeVar('ForceBuyResponse', TradeSchema, StatusMsg)
+class ForceBuyResponse(BaseModel):
+    __root__: Union[TradeSchema, StatusMsg]
 
 
 class LockModel(BaseModel):
@@ -267,7 +268,8 @@ class PlotConfig_(BaseModel):
     subplots: Optional[Dict[str, Any]]
 
 
-PlotConfig = TypeVar('PlotConfig', PlotConfig_, Dict)
+class PlotConfig(BaseModel):
+    __root__: Union[PlotConfig_, Dict]
 
 
 class StrategyListResponse(BaseModel):
diff --git a/freqtrade/rpc/api_server/api_v1.py b/freqtrade/rpc/api_server/api_v1.py
index 3588f2196..546b93afb 100644
--- a/freqtrade/rpc/api_server/api_v1.py
+++ b/freqtrade/rpc/api_server/api_v1.py
@@ -111,9 +111,9 @@ def forcebuy(payload: ForceBuyPayload, rpc: RPC = Depends(get_rpc)):
     trade = rpc._rpc_forcebuy(payload.pair, payload.price)
 
     if trade:
-        return trade.to_json()
+        return {'__root__': trade.to_json()}
     else:
-        return {"status": f"Error buying pair {payload.pair}."}
+        return {'__root__': {"status": f"Error buying pair {payload.pair}."}}
 
 
 @router.post('/forcesell', response_model=ResultMsg, tags=['trading'])
@@ -183,7 +183,7 @@ def pair_history(pair: str, timeframe: str, timerange: str, strategy: str,
 
 @router.get('/plot_config', response_model=PlotConfig, tags=['candle data'])
 def plot_config(rpc: RPC = Depends(get_rpc)):
-    return rpc._rpc_plot_config()
+    return {'__root__': rpc._rpc_plot_config()}
 
 
 @router.get('/strategies', response_model=StrategyListResponse, tags=['strategy'])
diff --git a/requirements-dev.txt b/requirements-dev.txt
index fa0ead603..6ca1a4d9c 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -7,7 +7,7 @@ coveralls==3.0.0
 flake8==3.8.4
 flake8-type-annotations==0.1.0
 flake8-tidy-imports==4.2.1
-mypy==0.790
+mypy==0.812
 pytest==6.2.2
 pytest-asyncio==0.14.0
 pytest-cov==2.11.1