diff --git a/CHANGELOG.md b/CHANGELOG.md
index 74031275..08c0e6bf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,8 @@
     - Added API calls for folder management
  - `serverupdate`: [v1.0.1](services/serverupdate/CHANGELOG.md#v101-2025-05-05)
   - **Minor change:** Use stderr by default.
+- `mongodbflex`: [v1.0.0](services/mongodbflex/CHANGELOG.md#v100-2025-05-05)
+  - **Breaking Change:** Introduce typed enum constants for status attributes
 
 ## Release (2025-04-30)
 - `stackitmarketplace`: [v0.4.0](services/stackitmarketplace/CHANGELOG.md#v040-2025-04-16)
diff --git a/services/mongodbflex/CHANGELOG.md b/services/mongodbflex/CHANGELOG.md
index 906cf2f4..32d7cd3f 100644
--- a/services/mongodbflex/CHANGELOG.md
+++ b/services/mongodbflex/CHANGELOG.md
@@ -1,3 +1,6 @@
+## v1.0.0 (2025-05-05)
+    - **Breaking Change:** Introduce typed enum constants for status attributes
+
 ## v0.3.0 (2025-01-21)
 
 - **Breaking change**: Delete endpoint made private.
diff --git a/services/mongodbflex/src/stackit/mongodbflex/configuration.py b/services/mongodbflex/src/stackit/mongodbflex/configuration.py
index 81166599..0b458a38 100644
--- a/services/mongodbflex/src/stackit/mongodbflex/configuration.py
+++ b/services/mongodbflex/src/stackit/mongodbflex/configuration.py
@@ -1,5 +1,10 @@
 # coding: utf-8
 
+import sys
+
+import os
+
+
 """
     STACKIT MongoDB Service API
 
@@ -12,8 +17,6 @@
     Do not edit the class manually.
 """  # noqa: E501 docstring might be too long
 
-import os
-
 
 class HostConfiguration:
     def __init__(
@@ -30,6 +33,7 @@ def __init__(
             "as a function argument instead of being set in the client configuration.\n"
             "Once all services have migrated, the methods to specify the region in the client configuration "
             "will be removed.",
+            file=sys.stderr,
         )
         """Constructor
         """
diff --git a/services/mongodbflex/src/stackit/mongodbflex/models/instance.py b/services/mongodbflex/src/stackit/mongodbflex/models/instance.py
index a5150b12..b0a4d1cf 100644
--- a/services/mongodbflex/src/stackit/mongodbflex/models/instance.py
+++ b/services/mongodbflex/src/stackit/mongodbflex/models/instance.py
@@ -18,7 +18,7 @@
 import pprint
 from typing import Any, ClassVar, Dict, List, Optional, Set
 
-from pydantic import BaseModel, ConfigDict, Field, StrictInt, StrictStr
+from pydantic import BaseModel, ConfigDict, Field, StrictInt, StrictStr, field_validator
 from typing_extensions import Self
 
 from stackit.mongodbflex.models.acl import ACL
@@ -38,7 +38,7 @@ class Instance(BaseModel):
     name: Optional[StrictStr] = None
     options: Optional[Dict[str, StrictStr]] = None
     replicas: Optional[StrictInt] = None
-    status: Optional[StrictStr] = None
+    status: Optional[StrictStr] = Field(default=None, description="The current status of the instance.")
     storage: Optional[Storage] = None
     version: Optional[StrictStr] = None
     __properties: ClassVar[List[str]] = [
@@ -54,6 +54,16 @@ class Instance(BaseModel):
         "version",
     ]
 
+    @field_validator("status")
+    def status_validate_enum(cls, value):
+        """Validates the enum"""
+        if value is None:
+            return value
+
+        if value not in set(["READY", "PENDING", "PROCESSING", "FAILED", "UNKNOWN"]):
+            raise ValueError("must be one of enum values ('READY', 'PENDING', 'PROCESSING', 'FAILED', 'UNKNOWN')")
+        return value
+
     model_config = ConfigDict(
         populate_by_name=True,
         validate_assignment=True,
diff --git a/services/mongodbflex/src/stackit/mongodbflex/models/instance_list_instance.py b/services/mongodbflex/src/stackit/mongodbflex/models/instance_list_instance.py
index edd590dd..dfd495e2 100644
--- a/services/mongodbflex/src/stackit/mongodbflex/models/instance_list_instance.py
+++ b/services/mongodbflex/src/stackit/mongodbflex/models/instance_list_instance.py
@@ -18,7 +18,7 @@
 import pprint
 from typing import Any, ClassVar, Dict, List, Optional, Set
 
-from pydantic import BaseModel, ConfigDict, StrictStr
+from pydantic import BaseModel, ConfigDict, Field, StrictStr, field_validator
 from typing_extensions import Self
 
 
@@ -29,9 +29,19 @@ class InstanceListInstance(BaseModel):
 
     id: Optional[StrictStr] = None
     name: Optional[StrictStr] = None
-    status: Optional[StrictStr] = None
+    status: Optional[StrictStr] = Field(default=None, description="The current status of the instance.")
     __properties: ClassVar[List[str]] = ["id", "name", "status"]
 
+    @field_validator("status")
+    def status_validate_enum(cls, value):
+        """Validates the enum"""
+        if value is None:
+            return value
+
+        if value not in set(["READY", "PENDING", "PROCESSING", "FAILED", "UNKNOWN"]):
+            raise ValueError("must be one of enum values ('READY', 'PENDING', 'PROCESSING', 'FAILED', 'UNKNOWN')")
+        return value
+
     model_config = ConfigDict(
         populate_by_name=True,
         validate_assignment=True,