diff --git a/services/kms/CHANGELOG.md b/services/kms/CHANGELOG.md
index 7657351b0..8bfdfe6b2 100644
--- a/services/kms/CHANGELOG.md
+++ b/services/kms/CHANGELOG.md
@@ -1,7 +1,3 @@
-## v1.13.0
-- **Breaking change:** Remove enum `Protection`
-- **Breaking change:** Change type of `Protection` attribute from `Protection` to `string` in `CreateWrappingKey`, `WrappingKey` and `Key` model
-
 ## v1.12.1
 - `v1api`:
   - **Fix:** Response decoding now supports `*io.Reader` and `*[]byte` target types (previously only `string`, `*os.File`, and JSON were supported)
diff --git a/services/kms/VERSION b/services/kms/VERSION
index b28120462..51b86ba24 100644
--- a/services/kms/VERSION
+++ b/services/kms/VERSION
@@ -1 +1 @@
-v1.13.0
+v1.12.1
diff --git a/services/kms/oas_commit b/services/kms/oas_commit
index 996d01233..cc7ae1bc0 100644
--- a/services/kms/oas_commit
+++ b/services/kms/oas_commit
@@ -1 +1 @@
-c9c11ba1b198dc952e8e192d1df98d65d85ba977
+7d3dd28f6339ef619d9cedc551b3b86a15936fe2
diff --git a/services/kms/v1api/handwritten.go b/services/kms/v1api/handwritten.go
deleted file mode 100644
index 523972fba..000000000
--- a/services/kms/v1api/handwritten.go
+++ /dev/null
@@ -1,31 +0,0 @@
-package v1api
-
-/*
-STACKIT Key Management Service API
-
-This API provides endpoints for managing keys and key rings.
-
-API version: 1.0.0
-*/
-
-// This is a handwritten file and is not generated.
-
-// Deprecated: Protection is deprecated and will be removed after February 2027. Use instead `string`.
-type Protection = string
-
-// List of protection
-const (
-	// Deprecated: PROTECTION_SOFTWARE is deprecated and will be removed after February 2027.
-	PROTECTION_SOFTWARE Protection = "software"
-	// Deprecated: PROTECTION_SOFTWARE is deprecated and will be removed after February 2027.
-	PROTECTION_HSM Protection = "hsm"
-	// Deprecated: PROTECTION_UNKNOWN_DEFAULT_OPEN_API is deprecated and will be removed after February 2027.
-	PROTECTION_UNKNOWN_DEFAULT_OPEN_API Protection = "unknown_default_open_api"
-)
-
-// Deprecated: AllowedProtectionEnumValues is deprecated and will be removed after February 2027.
-var AllowedProtectionEnumValues = []Protection{
-	"software",
-	"hsm",
-	"unknown_default_open_api",
-}