diff --git a/.travis.yml b/.travis.yml
index 2e0ff0f..dd5e62f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -60,7 +60,7 @@ install:
   - conda install ffmpeg
   - conda list
   - python -c "import imageio; imageio.plugins.ffmpeg.download()"
-  - pip install --upgrade pytest-cov flake8
+  - pip install --upgrade pytest-cov flake8==3.8.3
   - python setup.py install
 
 script:
diff --git a/run_pytest.sh b/run_pytest.sh
index 0dcdbdb..fe06b16 100755
--- a/run_pytest.sh
+++ b/run_pytest.sh
@@ -1,4 +1,4 @@
-pip install pytest boto3 moto onnx tensorboard matplotlib 
+pip install pytest boto3 moto onnx tensorboard matplotlib flake8==3.8.3
 
 if [ `ps|grep visdom |wc -l` = "1" ]
     then
diff --git a/tensorboardX/__init__.py b/tensorboardX/__init__.py
index 1802572..ab6922f 100644
--- a/tensorboardX/__init__.py
+++ b/tensorboardX/__init__.py
@@ -5,7 +5,7 @@
 from .torchvis import TorchVis
 from .writer import FileWriter, SummaryWriter
 from .global_writer import GlobalSummaryWriter
-__version__ = "dev" 
+__version__ = "dev"
 # will be overwritten if run setup.py
 # specifically, `python setup.py install` creates [version in setup.py + git SHA hash]
-# python setup.py sdist creates a decimal version number
\ No newline at end of file
+# python setup.py sdist creates a decimal version number