diff --git a/requirements.txt b/requirements.txt
index db768e8..414faf9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -32,7 +32,7 @@ pycparser==2.19           # via cffi
 pyparsing==2.2.1          # via matplotlib
 pytdx==1.67               # via mootdx
 pytest==3.8.1
-python-dateutil==2.7.3    # via matplotlib, pandas
+python-dateutil==2.8.0    # via matplotlib, pandas
 pytz==2018.5
 requests==2.19.1
 scipy==1.1.0
diff --git a/tests/requirements.txt b/tests/requirements.txt
index 446044f..11414c5 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -5,7 +5,7 @@ cryptography==2.3.1
 PyYAML==3.13
 pytest==3.8.1
 pytest-runner==4.2
-python-dateutil==2.7.3
+python-dateutil==2.8.0
 matplotlib==3.0.0
 requests==2.19.1
 tornado==5.1.1