diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3d0a0d3d2..e84634e7d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -385,6 +385,8 @@
       - New model structs `ExpirationStatus`, `ExpirationStatusKubernetes`, `ExpirationStatusNodepool`
   - [v1.13.1](services/ske/CHANGELOG.md#v1131)
     - **Dependencies:** Bump STACKIT SDK core module to `v0.26.0`
+  - [v1.14.0](services/ske/CHANGELOG.md#v1140)
+    - **Feature:** Added `_UNKNOWN_DEFAULT_OPEN_API` fallback value to all enums to handle unknown API values gracefully.`
 - `sqlserverflex`:
   - [v1.6.3](services/sqlserverflex/CHANGELOG.md#v163)
     - **Dependencies:** Bump STACKIT SDK core module from `v0.24.0` to `v0.24.1`
diff --git a/services/ske/CHANGELOG.md b/services/ske/CHANGELOG.md
index 6a50520f9..d95b1385b 100644
--- a/services/ske/CHANGELOG.md
+++ b/services/ske/CHANGELOG.md
@@ -1,3 +1,6 @@
+## v1.14.0
+- **Feature:** Added `_UNKNOWN_DEFAULT_OPEN_API` fallback value to all enums to handle unknown API values gracefully.
+
 ## v1.13.1
 - **Dependencies:** Bump STACKIT SDK core module to `v0.26.0`
 
diff --git a/services/ske/VERSION b/services/ske/VERSION
index 8cc47ae43..79f9beba8 100644
--- a/services/ske/VERSION
+++ b/services/ske/VERSION
@@ -1 +1 @@
-v1.13.1
+v1.14.0
diff --git a/services/ske/oas_commit b/services/ske/oas_commit
index 4b79dc0b4..6fdb25c73 100644
--- a/services/ske/oas_commit
+++ b/services/ske/oas_commit
@@ -1 +1 @@
-bda6ad3d9e8850526f25eddcb6589fcc7559c625
+c8e6adbf2c24050dca06a64b301b3a43ba28be6e
diff --git a/services/ske/v1api/model_cluster_status_state.go b/services/ske/v1api/model_cluster_status_state.go
index 8a29ca7eb..87ac8357e 100644
--- a/services/ske/v1api/model_cluster_status_state.go
+++ b/services/ske/v1api/model_cluster_status_state.go
@@ -20,14 +20,15 @@ type ClusterStatusState string
 
 // List of ClusterStatusState
 const (
-	CLUSTERSTATUSSTATE_STATE_HEALTHY     ClusterStatusState = "STATE_HEALTHY"
-	CLUSTERSTATUSSTATE_STATE_CREATING    ClusterStatusState = "STATE_CREATING"
-	CLUSTERSTATUSSTATE_STATE_DELETING    ClusterStatusState = "STATE_DELETING"
-	CLUSTERSTATUSSTATE_STATE_UNHEALTHY   ClusterStatusState = "STATE_UNHEALTHY"
-	CLUSTERSTATUSSTATE_STATE_RECONCILING ClusterStatusState = "STATE_RECONCILING"
-	CLUSTERSTATUSSTATE_STATE_HIBERNATED  ClusterStatusState = "STATE_HIBERNATED"
-	CLUSTERSTATUSSTATE_STATE_HIBERNATING ClusterStatusState = "STATE_HIBERNATING"
-	CLUSTERSTATUSSTATE_STATE_WAKINGUP    ClusterStatusState = "STATE_WAKINGUP"
+	CLUSTERSTATUSSTATE_STATE_HEALTHY            ClusterStatusState = "STATE_HEALTHY"
+	CLUSTERSTATUSSTATE_STATE_CREATING           ClusterStatusState = "STATE_CREATING"
+	CLUSTERSTATUSSTATE_STATE_DELETING           ClusterStatusState = "STATE_DELETING"
+	CLUSTERSTATUSSTATE_STATE_UNHEALTHY          ClusterStatusState = "STATE_UNHEALTHY"
+	CLUSTERSTATUSSTATE_STATE_RECONCILING        ClusterStatusState = "STATE_RECONCILING"
+	CLUSTERSTATUSSTATE_STATE_HIBERNATED         ClusterStatusState = "STATE_HIBERNATED"
+	CLUSTERSTATUSSTATE_STATE_HIBERNATING        ClusterStatusState = "STATE_HIBERNATING"
+	CLUSTERSTATUSSTATE_STATE_WAKINGUP           ClusterStatusState = "STATE_WAKINGUP"
+	CLUSTERSTATUSSTATE_UNKNOWN_DEFAULT_OPEN_API ClusterStatusState = "unknown_default_open_api"
 )
 
 // All allowed values of ClusterStatusState enum
@@ -40,6 +41,7 @@ var AllowedClusterStatusStateEnumValues = []ClusterStatusState{
 	"STATE_HIBERNATED",
 	"STATE_HIBERNATING",
 	"STATE_WAKINGUP",
+	"unknown_default_open_api",
 }
 
 func (v *ClusterStatusState) UnmarshalJSON(src []byte) error {
@@ -56,7 +58,8 @@ func (v *ClusterStatusState) UnmarshalJSON(src []byte) error {
 		}
 	}
 
-	return fmt.Errorf("%+v is not a valid ClusterStatusState", value)
+	*v = CLUSTERSTATUSSTATE_UNKNOWN_DEFAULT_OPEN_API
+	return nil
 }
 
 // NewClusterStatusStateFromValue returns a pointer to a valid ClusterStatusState
diff --git a/services/ske/v2api/model_access_scope.go b/services/ske/v2api/model_access_scope.go
index 21df037e6..02b716197 100644
--- a/services/ske/v2api/model_access_scope.go
+++ b/services/ske/v2api/model_access_scope.go
@@ -20,14 +20,16 @@ type AccessScope string
 
 // List of AccessScope
 const (
-	ACCESSSCOPE_PUBLIC AccessScope = "PUBLIC"
-	ACCESSSCOPE_SNA    AccessScope = "SNA"
+	ACCESSSCOPE_PUBLIC                   AccessScope = "PUBLIC"
+	ACCESSSCOPE_SNA                      AccessScope = "SNA"
+	ACCESSSCOPE_UNKNOWN_DEFAULT_OPEN_API AccessScope = "unknown_default_open_api"
 )
 
 // All allowed values of AccessScope enum
 var AllowedAccessScopeEnumValues = []AccessScope{
 	"PUBLIC",
 	"SNA",
+	"unknown_default_open_api",
 }
 
 func (v *AccessScope) UnmarshalJSON(src []byte) error {
@@ -44,7 +46,8 @@ func (v *AccessScope) UnmarshalJSON(src []byte) error {
 		}
 	}
 
-	return fmt.Errorf("%+v is not a valid AccessScope", value)
+	*v = ACCESSSCOPE_UNKNOWN_DEFAULT_OPEN_API
+	return nil
 }
 
 // NewAccessScopeFromValue returns a pointer to a valid AccessScope
diff --git a/services/ske/v2api/model_cluster_status_state.go b/services/ske/v2api/model_cluster_status_state.go
index cc0b7ec32..ba2b80086 100644
--- a/services/ske/v2api/model_cluster_status_state.go
+++ b/services/ske/v2api/model_cluster_status_state.go
@@ -20,14 +20,15 @@ type ClusterStatusState string
 
 // List of ClusterStatusState
 const (
-	CLUSTERSTATUSSTATE_STATE_HEALTHY     ClusterStatusState = "STATE_HEALTHY"
-	CLUSTERSTATUSSTATE_STATE_CREATING    ClusterStatusState = "STATE_CREATING"
-	CLUSTERSTATUSSTATE_STATE_DELETING    ClusterStatusState = "STATE_DELETING"
-	CLUSTERSTATUSSTATE_STATE_UNHEALTHY   ClusterStatusState = "STATE_UNHEALTHY"
-	CLUSTERSTATUSSTATE_STATE_RECONCILING ClusterStatusState = "STATE_RECONCILING"
-	CLUSTERSTATUSSTATE_STATE_HIBERNATED  ClusterStatusState = "STATE_HIBERNATED"
-	CLUSTERSTATUSSTATE_STATE_HIBERNATING ClusterStatusState = "STATE_HIBERNATING"
-	CLUSTERSTATUSSTATE_STATE_WAKINGUP    ClusterStatusState = "STATE_WAKINGUP"
+	CLUSTERSTATUSSTATE_STATE_HEALTHY            ClusterStatusState = "STATE_HEALTHY"
+	CLUSTERSTATUSSTATE_STATE_CREATING           ClusterStatusState = "STATE_CREATING"
+	CLUSTERSTATUSSTATE_STATE_DELETING           ClusterStatusState = "STATE_DELETING"
+	CLUSTERSTATUSSTATE_STATE_UNHEALTHY          ClusterStatusState = "STATE_UNHEALTHY"
+	CLUSTERSTATUSSTATE_STATE_RECONCILING        ClusterStatusState = "STATE_RECONCILING"
+	CLUSTERSTATUSSTATE_STATE_HIBERNATED         ClusterStatusState = "STATE_HIBERNATED"
+	CLUSTERSTATUSSTATE_STATE_HIBERNATING        ClusterStatusState = "STATE_HIBERNATING"
+	CLUSTERSTATUSSTATE_STATE_WAKINGUP           ClusterStatusState = "STATE_WAKINGUP"
+	CLUSTERSTATUSSTATE_UNKNOWN_DEFAULT_OPEN_API ClusterStatusState = "unknown_default_open_api"
 )
 
 // All allowed values of ClusterStatusState enum
@@ -40,6 +41,7 @@ var AllowedClusterStatusStateEnumValues = []ClusterStatusState{
 	"STATE_HIBERNATED",
 	"STATE_HIBERNATING",
 	"STATE_WAKINGUP",
+	"unknown_default_open_api",
 }
 
 func (v *ClusterStatusState) UnmarshalJSON(src []byte) error {
@@ -56,7 +58,8 @@ func (v *ClusterStatusState) UnmarshalJSON(src []byte) error {
 		}
 	}
 
-	return fmt.Errorf("%+v is not a valid ClusterStatusState", value)
+	*v = CLUSTERSTATUSSTATE_UNKNOWN_DEFAULT_OPEN_API
+	return nil
 }
 
 // NewClusterStatusStateFromValue returns a pointer to a valid ClusterStatusState
diff --git a/services/ske/v2api/model_get_provider_options_request_version_state.go b/services/ske/v2api/model_get_provider_options_request_version_state.go
index eaade1e1c..d40bdf24d 100644
--- a/services/ske/v2api/model_get_provider_options_request_version_state.go
+++ b/services/ske/v2api/model_get_provider_options_request_version_state.go
@@ -20,12 +20,14 @@ type GetProviderOptionsRequestVersionState string
 
 // List of GetProviderOptionsRequestVersionState
 const (
-	GETPROVIDEROPTIONSREQUESTVERSIONSTATE_SUPPORTED GetProviderOptionsRequestVersionState = "SUPPORTED"
+	GETPROVIDEROPTIONSREQUESTVERSIONSTATE_SUPPORTED                GetProviderOptionsRequestVersionState = "SUPPORTED"
+	GETPROVIDEROPTIONSREQUESTVERSIONSTATE_UNKNOWN_DEFAULT_OPEN_API GetProviderOptionsRequestVersionState = "unknown_default_open_api"
 )
 
 // All allowed values of GetProviderOptionsRequestVersionState enum
 var AllowedGetProviderOptionsRequestVersionStateEnumValues = []GetProviderOptionsRequestVersionState{
 	"SUPPORTED",
+	"unknown_default_open_api",
 }
 
 func (v *GetProviderOptionsRequestVersionState) UnmarshalJSON(src []byte) error {
@@ -42,7 +44,8 @@ func (v *GetProviderOptionsRequestVersionState) UnmarshalJSON(src []byte) error
 		}
 	}
 
-	return fmt.Errorf("%+v is not a valid GetProviderOptionsRequestVersionState", value)
+	*v = GETPROVIDEROPTIONSREQUESTVERSIONSTATE_UNKNOWN_DEFAULT_OPEN_API
+	return nil
 }
 
 // NewGetProviderOptionsRequestVersionStateFromValue returns a pointer to a valid GetProviderOptionsRequestVersionState