diff --git a/pool_automation/requirements.txt b/pool_automation/requirements.txt
index 3d7d36c61..c94c0f65d 100644
--- a/pool_automation/requirements.txt
+++ b/pool_automation/requirements.txt
@@ -1,3 +1,3 @@
 ansible
 boto3
-pexpect>=3.3 # required by ansible expect module
+pexpect>=4.9.0 # required by ansible expect module