diff --git a/test/runner/requirements/constraints.txt b/test/runner/requirements/constraints.txt
index 3d0ddc1954..cbec5b49a8 100644
--- a/test/runner/requirements/constraints.txt
+++ b/test/runner/requirements/constraints.txt
@@ -27,6 +27,7 @@ xmltodict < 0.12.0 ; python_version < '2.7' # xmltodict 0.12.0 and later require
 lxml < 4.3.0 ; python_version < '2.7' # lxml 4.3.0 and later require python 2.7 or later
 pyvmomi < 6.0.0 ; python_version < '2.7' # pyvmomi 6.0.0 and later require python 2.7 or later
 pytest < 3.10.0 ; python_version >= '2.7' # pytest 3.10.0+ causes some tests to crash, pytest 4.2.0+ causes internal errors in pytest-forked
+pyone == 1.1.9 # newer versions do not pass current integration tests
 
 # freeze pylint and its requirements for consistent test results
 astroid == 2.0.4