diff --git a/TTS/utils/synthesizer.py b/TTS/utils/synthesizer.py
index 4131bc7c..85e116cf 100644
--- a/TTS/utils/synthesizer.py
+++ b/TTS/utils/synthesizer.py
@@ -11,7 +11,7 @@ from TTS.tts.utils.speakers import load_speaker_mapping
 from TTS.vocoder.utils.generic_utils import setup_generator, interpolate_vocoder_input
 # pylint: disable=unused-wildcard-import
 # pylint: disable=wildcard-import
-from TTS.tts.utils.synthesis import *
+from TTS.tts.utils.synthesis import synthesis, trim_silence
 
 from TTS.tts.utils.text import make_symbols, phonemes, symbols
 
diff --git a/setup.py b/setup.py
index 188a5263..5c75ff25 100644
--- a/setup.py
+++ b/setup.py
@@ -5,14 +5,20 @@ import os
 import shutil
 import subprocess
 import sys
+from distutils.extension import Extension
+from distutils.version import LooseVersion
 
 import numpy
 import setuptools.command.build_py
 import setuptools.command.develop
-
-from setuptools import find_packages, setup
-from distutils.extension import Extension
 from Cython.Build import cythonize
+from setuptools import find_packages, setup
+
+if LooseVersion(sys.version) < LooseVersion("3.6") or LooseVersion(sys.version) > LooseVersion("3.9"):
+    raise RuntimeError(
+        "TTS requires python >= 3.6 and <3.9 "
+        "but your Python version is {}".format(sys.version)
+    )
 
 # parameters for wheeling server.
 parser = argparse.ArgumentParser(add_help=False, allow_abbrev=False)