diff --git a/test-requirements.txt b/test-requirements.txt
index 7aafcff..f968522 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,3 +1,3 @@
 Sphinx <= 1.6; python_version < '2.7'
 Sphinx > 1.6; python_version >= '2.7'
-snmpsim < '1.0.0'
+snmpsim < 1.0.0