diff --git a/tests/requirements.in b/tests/requirements.in
index cff4d5b..4421360 100644
--- a/tests/requirements.in
+++ b/tests/requirements.in
@@ -6,7 +6,7 @@ pytest
 requests
 chardet
 PyYAML
-lark
+lark<=1.1.9
 networkx
 pyodbc
 sqlparams