diff --git a/req-rtd.txt b/req-rtd.txt
index 346380609..cf4201598 100644
--- a/req-rtd.txt
+++ b/req-rtd.txt
@@ -1,5 +1,5 @@
 picklable-itertools==0.1.1
 progressbar2==3.6.2
-pyyaml==3.11
+pyyaml==5.1
 requests==2.20.0
 six==1.10.0
diff --git a/req-travis-conda.txt b/req-travis-conda.txt
index 6ef244e17..b113c96ec 100644
--- a/req-travis-conda.txt
+++ b/req-travis-conda.txt
@@ -5,7 +5,7 @@ nose==1.3.7
 numpy==1.10.4
 pillow==5.2.0
 pytables==3.4.4
-pyyaml==3.13
+pyyaml==5.1
 pyzmq==15.2.0
 scipy==0.17.0
 six==1.10.0
diff --git a/requirements.txt b/requirements.txt
index a1d32aa29..a708aa06f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@ tables==3.4.4
 picklable-itertools==0.1.1
 pillow==5.2.0
 progressbar2==3.6.2
-pyyaml==3.13
+pyyaml==5.1
 pyzmq==15.2.0
 requests==2.20.0
 scipy==0.17.0