diff --git a/requirements.txt b/requirements.txt
index 97b4e227..cf69d612 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -46,7 +46,7 @@ PyYAML==3.13
 pytz==2018.5
 requests==2.19.1
 setuptools_scm>=1.15.0
-six==1.11.0
+six==1.17.0
 snowballstemmer==1.2.1
 Sphinx==1.7.4
 sphinxcontrib-websupport==1.1.0
diff --git a/requirements_dev.txt b/requirements_dev.txt
index 5404d8d3..811c7ec9 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -44,7 +44,7 @@ PyYAML==3.13
 pytz==2018.5
 requests==2.19.1
 setuptools_scm>=1.15.0
-six==1.11.0
+six==1.17.0
 snowballstemmer==1.2.1
 Sphinx==1.7.4
 sphinxcontrib-websupport==1.1.0