diff --git a/requirements.txt b/requirements.txt
index 184af376..970c5994 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,3 +8,4 @@ psutil>=3.0.0
 zipstream>=1.1.4
 typing>=3.5.3.0 # Otherwise yarl fails with python 3.4
 prompt-toolkit
+async-timeout<3.0.0 # pyup: ignore; 3.0 drops support for python 3.4
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