diff --git a/services/resourcemanager/oas_commit b/services/resourcemanager/oas_commit
index b687a3969..968568376 100644
--- a/services/resourcemanager/oas_commit
+++ b/services/resourcemanager/oas_commit
@@ -1 +1 @@
-f22dd14374388602d895c8892b3e5b110dc16582
+9ff2efb2c9614ebfffa878f0a99f82ee15fd4b9d
diff --git a/services/resourcemanager/src/stackit/resourcemanager/models/partial_update_folder_payload.py b/services/resourcemanager/src/stackit/resourcemanager/models/partial_update_folder_payload.py
index 2a148b269..4dd64595c 100644
--- a/services/resourcemanager/src/stackit/resourcemanager/models/partial_update_folder_payload.py
+++ b/services/resourcemanager/src/stackit/resourcemanager/models/partial_update_folder_payload.py
@@ -33,9 +33,9 @@ class PartialUpdateFolderPayload(BaseModel):
         description="New parent identifier for the resource container - containerId as well as UUID identifier is supported.",
         alias="containerParentId",
     )
-    labels: Optional[Dict[str, StrictStr]] = Field(
+    labels: Optional[Dict[str, Optional[StrictStr]]] = Field(
         default=None,
-        description="Key-value string pairs attached to an existing resource container. Certain labels may be enforced via organizational policies.  * **Key:** Must match the regex `[A-ZÄÜÖa-zäüöß0-9_-]{1,64}` * **Value:** Must match the regex `^$|[A-ZÄÜÖa-zäüöß0-9_-]{1,64}`  > Note: Additional naming restrictions may apply depending on your specific organization.*",
+        description="Key-value string pairs attached to an existing resource container. Certain labels may be enforced via organizational policies.  Setting an individual label's value to `null` removes/deletes that label from the resource.  * **Key:** Must match the regex `[A-ZÄÜÖa-zäüöß0-9_-]{1,64}` * **Value:** Must match the regex `^$|[A-ZÄÜÖa-zäüöß0-9_-]{1,64}`, or be `null` to delete the label  > Note: Additional naming restrictions may apply depending on your specific organization.*",
     )
     name: Optional[Annotated[str, Field(strict=True)]] = Field(
         default=None,
diff --git a/services/resourcemanager/src/stackit/resourcemanager/models/partial_update_organization_payload.py b/services/resourcemanager/src/stackit/resourcemanager/models/partial_update_organization_payload.py
index bf1744e27..7041404b8 100644
--- a/services/resourcemanager/src/stackit/resourcemanager/models/partial_update_organization_payload.py
+++ b/services/resourcemanager/src/stackit/resourcemanager/models/partial_update_organization_payload.py
@@ -28,9 +28,9 @@ class PartialUpdateOrganizationPayload(BaseModel):
     PartialUpdateOrganizationPayload
     """  # noqa: E501
 
-    labels: Optional[Dict[str, StrictStr]] = Field(
+    labels: Optional[Dict[str, Optional[StrictStr]]] = Field(
         default=None,
-        description="Key-value string pairs attached to an existing resource container. Certain labels may be enforced via organizational policies.  * **Key:** Must match the regex `[A-ZÄÜÖa-zäüöß0-9_-]{1,64}` * **Value:** Must match the regex `^$|[A-ZÄÜÖa-zäüöß0-9_-]{1,64}`  > Note: Additional naming restrictions may apply depending on your specific organization.*",
+        description="Key-value string pairs attached to an existing resource container. Certain labels may be enforced via organizational policies.  Setting an individual label's value to `null` removes/deletes that label from the resource.  * **Key:** Must match the regex `[A-ZÄÜÖa-zäüöß0-9_-]{1,64}` * **Value:** Must match the regex `^$|[A-ZÄÜÖa-zäüöß0-9_-]{1,64}`, or be `null` to delete the label  > Note: Additional naming restrictions may apply depending on your specific organization.*",
     )
     name: Optional[Annotated[str, Field(strict=True)]] = Field(
         default=None,
diff --git a/services/resourcemanager/src/stackit/resourcemanager/models/partial_update_project_payload.py b/services/resourcemanager/src/stackit/resourcemanager/models/partial_update_project_payload.py
index e78b03157..1df33cd1c 100644
--- a/services/resourcemanager/src/stackit/resourcemanager/models/partial_update_project_payload.py
+++ b/services/resourcemanager/src/stackit/resourcemanager/models/partial_update_project_payload.py
@@ -33,9 +33,9 @@ class PartialUpdateProjectPayload(BaseModel):
         description="New parent identifier for the resource container - containerId as well as UUID identifier is supported.",
         alias="containerParentId",
     )
-    labels: Optional[Dict[str, StrictStr]] = Field(
+    labels: Optional[Dict[str, Optional[StrictStr]]] = Field(
         default=None,
-        description="Key-value string pairs attached to an existing resource container. Certain labels may be enforced via organizational policies.  * **Key:** Must match the regex `[A-ZÄÜÖa-zäüöß0-9_-]{1,64}` * **Value:** Must match the regex `^$|[A-ZÄÜÖa-zäüöß0-9_-]{1,64}`  > Note: Additional naming restrictions may apply depending on your specific organization.*",
+        description="Key-value string pairs attached to an existing resource container. Certain labels may be enforced via organizational policies.  Setting an individual label's value to `null` removes/deletes that label from the resource.  * **Key:** Must match the regex `[A-ZÄÜÖa-zäüöß0-9_-]{1,64}` * **Value:** Must match the regex `^$|[A-ZÄÜÖa-zäüöß0-9_-]{1,64}`, or be `null` to delete the label  > Note: Additional naming restrictions may apply depending on your specific organization.*",
     )
     name: Optional[Annotated[str, Field(strict=True)]] = Field(
         default=None,