diff --git a/homeassistant/package_constraints.txt b/homeassistant/package_constraints.txt
index 7da87160684..a2dc9572c81 100644
--- a/homeassistant/package_constraints.txt
+++ b/homeassistant/package_constraints.txt
@@ -6,6 +6,7 @@ jinja2>=2.9.6
 voluptuous==0.10.5
 typing>=3,<4
 aiohttp==2.2.5
+yarl==0.13
 async_timeout==2.0.0
 chardet==3.0.4
 astral==1.4
diff --git a/requirements_all.txt b/requirements_all.txt
index a2aa2bb1057..fb22149e54d 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -7,6 +7,7 @@ jinja2>=2.9.6
 voluptuous==0.10.5
 typing>=3,<4
 aiohttp==2.2.5
+yarl==0.13
 async_timeout==2.0.0
 chardet==3.0.4
 astral==1.4
diff --git a/setup.py b/setup.py
index cd7043650ad..3eb636d0801 100755
--- a/setup.py
+++ b/setup.py
@@ -23,6 +23,7 @@ REQUIRES = [
     'voluptuous==0.10.5',
     'typing>=3,<4',
     'aiohttp==2.2.5',
+    'yarl==0.13',  # Update this whenever you update aiohttp
     'async_timeout==2.0.0',
     'chardet==3.0.4',
     'astral==1.4',