diff --git a/requirements_py27_dev.txt b/requirements_py27_dev.txt
index 1a293f4..9faa7d1 100644
--- a/requirements_py27_dev.txt
+++ b/requirements_py27_dev.txt
@@ -74,7 +74,7 @@ pyparsing==2.1.10
 pytest==3.0.6
 python-igraph==0.7.1.post6
 pytz==2016.10
-PyYAML==3.12
+PyYAML==5.4
 pyzmq==16.0.2
 qtconsole==4.2.1
 requests==2.13.0
diff --git a/requirements_py3_dev.txt b/requirements_py3_dev.txt
index d1c99f0..71dd949 100644
--- a/requirements_py3_dev.txt
+++ b/requirements_py3_dev.txt
@@ -71,7 +71,7 @@ pyparsing==2.1.10
 pytest==3.0.6
 python-igraph==0.7.1.post6
 pytz==2016.10
-PyYAML==3.12
+PyYAML==5.4
 pyzmq==16.0.2
 qtconsole==4.2.1
 requests==2.13.0