diff --git a/requirements.in b/requirements.in
index 9bac01f..c38e81f 100644
--- a/requirements.in
+++ b/requirements.in
@@ -18,7 +18,7 @@
 pyangbind
 python-openstackclient
 pyyaml<6
-regex
+regex==2021.11.10 # from IM
 requests
 robotframework
 robotframework-jsonlibrary
diff --git a/requirements.txt b/requirements.txt
index c0c3d65..bd34c9f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -236,7 +236,7 @@
     #   openstacksdk
     #   oslo.config
     #   yq
-regex==2022.1.18
+regex==2021.11.10
     # via
     #   -r requirements.in
     #   pyangbind