diff --git a/homeassistant/package_constraints.txt b/homeassistant/package_constraints.txt
index a3d8a00bcfb944..c1bbe51755fba0 100644
--- a/homeassistant/package_constraints.txt
+++ b/homeassistant/package_constraints.txt
@@ -106,3 +106,7 @@ authlib<1.0
 # Pin backoff for compatibility until most libraries have been updated
 # https://github.com/home-assistant/core/pull/70817
 backoff<2.0
+
+# Breaking change in version
+# https://github.com/samuelcolvin/pydantic/issues/4092
+pydantic!=1.9.1
diff --git a/script/gen_requirements_all.py b/script/gen_requirements_all.py
index adf57f14f97473..88524ab63de9da 100755
--- a/script/gen_requirements_all.py
+++ b/script/gen_requirements_all.py
@@ -126,6 +126,10 @@
 # Pin backoff for compatibility until most libraries have been updated
 # https://github.com/home-assistant/core/pull/70817
 backoff<2.0
+
+# Breaking change in version
+# https://github.com/samuelcolvin/pydantic/issues/4092
+pydantic!=1.9.1
 """
 
 IGNORE_PRE_COMMIT_HOOK_ID = (