diff --git a/requirements.txt b/requirements.txt
index c82bb798..2578f031 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 jsonschema==2.6.0
-aiohttp==2.3.10
-aiohttp-cors==0.5.3
+aiohttp>=2.3.3,<2.4.0 # pyup: ignore
+aiohttp-cors>=0.5.3,<0.6.0 # pyup: ignore
 yarl>=0.11
 Jinja2>=2.7.3
 raven>=5.23.0
@@ -9,4 +9,3 @@ zipstream>=1.1.4
 typing>=3.5.3.0 # Otherwise yarl fails with python 3.4
 prompt-toolkit==1.0.15
 async-timeout<3.0.0 # pyup: ignore; 3.0 drops support for python 3.4
-