diff --git a/freqtrade/exchange/exchange.py b/freqtrade/exchange/exchange.py
index e5c2f353a..8ba9e82ef 100644
--- a/freqtrade/exchange/exchange.py
+++ b/freqtrade/exchange/exchange.py
@@ -286,7 +286,6 @@ class Exchange(object):
         """
         Checks if ticker interval from config is a supported timeframe on the exchange
         """
-        logger.warning("validate_timerames")
         if not hasattr(self._api, "timeframes"):
             # If timeframes is missing, the exchange probably has no fetchOHLCV method.
             # Therefore we also show that.
diff --git a/freqtrade/tests/exchange/test_exchange.py b/freqtrade/tests/exchange/test_exchange.py
index 48a8538a9..b74882ad4 100644
--- a/freqtrade/tests/exchange/test_exchange.py
+++ b/freqtrade/tests/exchange/test_exchange.py
@@ -396,6 +396,23 @@ def test_validate_timeframes_failed(default_conf, mocker):
         Exchange(default_conf)
 
 
+def test_validate_timeframes_emulated_ohlcv(default_conf, mocker):
+    default_conf["ticker_interval"] = "3m"
+    api_mock = MagicMock()
+    id_mock = PropertyMock(return_value='test_exchange')
+    type(api_mock).id = id_mock
+
+    # delete timeframes so magicmock does not autocreate it
+    del api_mock.timeframes
+
+    mocker.patch('freqtrade.exchange.Exchange._init_ccxt', MagicMock(return_value=api_mock))
+    mocker.patch('freqtrade.exchange.Exchange._load_markets', MagicMock(return_value={}))
+    mocker.patch('freqtrade.exchange.Exchange.validate_pairs', MagicMock())
+    with pytest.raises(OperationalException,
+                       match=r'This exchange (.*) does not have a `timeframes` attribute and*'):
+        Exchange(default_conf)
+
+
 def test_validate_timeframes_not_in_config(default_conf, mocker):
     del default_conf["ticker_interval"]
     api_mock = MagicMock()
diff --git a/requirements-common.txt b/requirements-common.txt
index 6913217ff..409c979b5 100644
--- a/requirements-common.txt
+++ b/requirements-common.txt
@@ -1,6 +1,6 @@
 # requirements without requirements installable via conda
 # mainly used for Raspberry pi installs
-ccxt==1.18.805
+ccxt==1.18.860
 SQLAlchemy==1.3.5
 python-telegram-bot==11.1.0
 arrow==0.14.2
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 1232d4dd4..c360bc85e 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -5,9 +5,9 @@
 flake8==3.7.7
 flake8-type-annotations==0.1.0
 flake8-tidy-imports==2.0.0
-pytest==4.6.3
+pytest==5.0.0
 pytest-mock==1.10.4
 pytest-asyncio==0.10.0
 pytest-cov==2.7.1
 coveralls==1.8.1
-mypy==0.710
+mypy==0.711