diff --git a/doc/requirements.txt b/doc/requirements.txt
index 950a3c5f..41f98c39 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -4,4 +4,4 @@ matplotlib >= 3.5.1
 numpydoc >= 1.2.0
 recommonmark >= 0.6.0
 sphinx >= 4.4.0
-secondarycoolantprops >= 1.0.0
+secondarycoolantprops >= 1.1.0