diff --git a/requirements.txt b/requirements.txt
index 2e3cba6f..f941d6ab 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 backoff>=1.4.3
 certifi>=2018.4.16
-expiringdict>=1.1.4
+expiringdict>=1.1.4,<1.2.0
 six>=1.10.0
 pyRFC3339>=1.0
 semver>=2.7.9