diff --git a/requirements.txt b/requirements.txt
index 622bb14d0..30a1a88d6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,4 +6,4 @@ enum34
 python-vxi11>=0.8
 pyusb
 python-usbtmc
-ruamel.yaml
+ruamel.yaml~=0.14.12