diff --git a/pipeline/requirements.txt b/pipeline/requirements.txt
index 83443ed3..87087d7d 100644
--- a/pipeline/requirements.txt
+++ b/pipeline/requirements.txt
@@ -1,5 +1,5 @@
 PyYAML
-ontobio==2.9.7
+ontobio==2.9.2
 click
 pyparsing==2.4.7
 antlr4-python3-runtime==4.9.3