diff --git a/homeassistant/package_constraints.txt b/homeassistant/package_constraints.txt
index 493216ec75ed9d5ec96718b6feff85cca438fc53..4b324d95500a50780222ea8a29578706fe64b446 100644
--- a/homeassistant/package_constraints.txt
+++ b/homeassistant/package_constraints.txt
@@ -17,7 +17,7 @@ netdisco==2.6.0
 pip>=8.0.3
 python-slugify==3.0.2
 pytz>=2019.01
-pyyaml==5.1
+pyyaml==5.1.1
 requests==2.22.0
 ruamel.yaml==0.15.97
 sqlalchemy==1.3.5
diff --git a/requirements_all.txt b/requirements_all.txt
index c7d3e6220147e610cc4fafeb9c59206cea6cedb4..9943a061bc90d3e16e3833175ea55ea8dbdfc6d4 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -12,7 +12,7 @@ cryptography==2.6.1
 pip>=8.0.3
 python-slugify==3.0.2
 pytz>=2019.01
-pyyaml==5.1
+pyyaml==5.1.1
 requests==2.22.0
 ruamel.yaml==0.15.97
 voluptuous==0.11.5
diff --git a/setup.py b/setup.py
index 3b89c6fbc30b57e6fbeb611811535c318a9f68e7..5b2678d8d00117c629d31a0c7a0079d17d8db1c2 100755
--- a/setup.py
+++ b/setup.py
@@ -46,7 +46,7 @@ REQUIRES = [
     'pip>=8.0.3',
     'python-slugify==3.0.2',
     'pytz>=2019.01',
-    'pyyaml==5.1',
+    'pyyaml==5.1.1',
     'requests==2.22.0',
     'ruamel.yaml==0.15.97',
     'voluptuous==0.11.5',