diff --git a/CHANGELOG.md b/CHANGELOG.md
index 93f9d82f..d0c0eea3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,9 @@
   - **Feature:** Delete Project labels using the new method `DeleteProjectLabels`
   - **Feature:** List folders using the new method `ListFolders`
   - **Feature:** Partial Update Organization using the new method `PartialUpdateOrganization`
+- `stackitmarketplace`: [v1.2.0](services/stackitmarketplace/CHANGELOG.md#v120-2025-06-06)
+  - **Fix:** Fixed types for `VendorId`, `ProjectId`, `OrganizationId` and `SubscriptionId`
+
 
 ## Release (2025-06-03)
 
diff --git a/services/stackitmarketplace/CHANGELOG.md b/services/stackitmarketplace/CHANGELOG.md
index 10cbbca6..7f86bdda 100644
--- a/services/stackitmarketplace/CHANGELOG.md
+++ b/services/stackitmarketplace/CHANGELOG.md
@@ -1,3 +1,6 @@
+# v1.2.0 (2025-06-06)
+- **Fix:** Fixed types for `VendorId`, `ProjectId`, `OrganizationId` and `SubscriptionId`
+
 ## v1.1.3 (2025-06-02)
 - **Feature:** Added `industries` to `CatalogProductDetail`
 
diff --git a/services/stackitmarketplace/pyproject.toml b/services/stackitmarketplace/pyproject.toml
index 67b33f66..92e1d1b2 100644
--- a/services/stackitmarketplace/pyproject.toml
+++ b/services/stackitmarketplace/pyproject.toml
@@ -3,7 +3,7 @@ name = "stackit-stackitmarketplace"
 
 [tool.poetry]
 name = "stackit-stackitmarketplace"
-version = "v1.1.3"
+version = "v1.2.0"
 authors = [
     "STACKIT Developer Tools <developer-tools@stackit.cloud>",
 ]
diff --git a/services/stackitmarketplace/src/stackit/stackitmarketplace/models/catalog_product_details_vendor.py b/services/stackitmarketplace/src/stackit/stackitmarketplace/models/catalog_product_details_vendor.py
index e39ac175..f110cbf7 100644
--- a/services/stackitmarketplace/src/stackit/stackitmarketplace/models/catalog_product_details_vendor.py
+++ b/services/stackitmarketplace/src/stackit/stackitmarketplace/models/catalog_product_details_vendor.py
@@ -38,7 +38,9 @@ class CatalogProductDetailsVendor(BaseModel):
     description: StrictStr = Field(description="The vendor description.")
     logo: Union[StrictBytes, StrictStr] = Field(description="The logo base64 encoded.")
     name: Annotated[str, Field(strict=True, max_length=512)] = Field(description="The product's vendor name.")
-    vendor_id: object = Field(alias="vendorId")
+    vendor_id: Annotated[str, Field(min_length=36, strict=True, max_length=36)] = Field(
+        description="Universally Unique Identifier (UUID).", alias="vendorId"
+    )
     video_url: Annotated[str, Field(strict=True, max_length=512)] = Field(
         description="The vendor video URL.", alias="videoUrl"
     )
@@ -54,6 +56,15 @@ def name_validate_regular_expression(cls, value):
             raise ValueError(r"must validate the regular expression /^[a-zA-ZäüöÄÜÖ0-9,.!?()@\/:=\n\t -]+$/")
         return value
 
+    @field_validator("vendor_id")
+    def vendor_id_validate_regular_expression(cls, value):
+        """Validates the regular expression"""
+        if not re.match(r"^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$", value):
+            raise ValueError(
+                r"must validate the regular expression /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/"
+            )
+        return value
+
     @field_validator("video_url")
     def video_url_validate_regular_expression(cls, value):
         """Validates the regular expression"""
diff --git a/services/stackitmarketplace/src/stackit/stackitmarketplace/models/catalog_product_overview_vendor.py b/services/stackitmarketplace/src/stackit/stackitmarketplace/models/catalog_product_overview_vendor.py
index 0d5d2f10..e6a26e6c 100644
--- a/services/stackitmarketplace/src/stackit/stackitmarketplace/models/catalog_product_overview_vendor.py
+++ b/services/stackitmarketplace/src/stackit/stackitmarketplace/models/catalog_product_overview_vendor.py
@@ -29,7 +29,9 @@ class CatalogProductOverviewVendor(BaseModel):
     """
 
     name: Annotated[str, Field(strict=True, max_length=512)] = Field(description="The product's vendor name.")
-    vendor_id: object = Field(alias="vendorId")
+    vendor_id: Annotated[str, Field(min_length=36, strict=True, max_length=36)] = Field(
+        description="Universally Unique Identifier (UUID).", alias="vendorId"
+    )
     website_url: Annotated[str, Field(strict=True, max_length=512)] = Field(
         description="Uniform Resource Locator.", alias="websiteUrl"
     )
@@ -42,6 +44,15 @@ def name_validate_regular_expression(cls, value):
             raise ValueError(r"must validate the regular expression /^[a-zA-ZäüöÄÜÖ0-9,.!?()@\/:=\n\t -]+$/")
         return value
 
+    @field_validator("vendor_id")
+    def vendor_id_validate_regular_expression(cls, value):
+        """Validates the regular expression"""
+        if not re.match(r"^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$", value):
+            raise ValueError(
+                r"must validate the regular expression /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/"
+            )
+        return value
+
     @field_validator("website_url")
     def website_url_validate_regular_expression(cls, value):
         """Validates the regular expression"""
diff --git a/services/stackitmarketplace/src/stackit/stackitmarketplace/models/vendor_subscription.py b/services/stackitmarketplace/src/stackit/stackitmarketplace/models/vendor_subscription.py
index e0194804..1bbfef6e 100644
--- a/services/stackitmarketplace/src/stackit/stackitmarketplace/models/vendor_subscription.py
+++ b/services/stackitmarketplace/src/stackit/stackitmarketplace/models/vendor_subscription.py
@@ -16,10 +16,11 @@
 
 import json
 import pprint
+import re
 from typing import Any, ClassVar, Dict, List, Optional, Set
 
-from pydantic import BaseModel, ConfigDict, Field
-from typing_extensions import Self
+from pydantic import BaseModel, ConfigDict, Field, field_validator
+from typing_extensions import Annotated, Self
 
 from stackit.stackitmarketplace.models.subscription_lifecycle_state import (
     SubscriptionLifecycleState,
@@ -33,12 +34,45 @@ class VendorSubscription(BaseModel):
     """
 
     lifecycle_state: SubscriptionLifecycleState = Field(alias="lifecycleState")
-    organization_id: object = Field(alias="organizationId")
+    organization_id: Annotated[str, Field(min_length=36, strict=True, max_length=36)] = Field(
+        description="Universally Unique Identifier (UUID).", alias="organizationId"
+    )
     product: SubscriptionProduct
-    project_id: object = Field(alias="projectId")
-    subscription_id: object = Field(alias="subscriptionId")
+    project_id: Annotated[str, Field(min_length=36, strict=True, max_length=36)] = Field(
+        description="Universally Unique Identifier (UUID).", alias="projectId"
+    )
+    subscription_id: Annotated[str, Field(min_length=36, strict=True, max_length=36)] = Field(
+        description="Universally Unique Identifier (UUID).", alias="subscriptionId"
+    )
     __properties: ClassVar[List[str]] = ["lifecycleState", "organizationId", "product", "projectId", "subscriptionId"]
 
+    @field_validator("organization_id")
+    def organization_id_validate_regular_expression(cls, value):
+        """Validates the regular expression"""
+        if not re.match(r"^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$", value):
+            raise ValueError(
+                r"must validate the regular expression /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/"
+            )
+        return value
+
+    @field_validator("project_id")
+    def project_id_validate_regular_expression(cls, value):
+        """Validates the regular expression"""
+        if not re.match(r"^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$", value):
+            raise ValueError(
+                r"must validate the regular expression /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/"
+            )
+        return value
+
+    @field_validator("subscription_id")
+    def subscription_id_validate_regular_expression(cls, value):
+        """Validates the regular expression"""
+        if not re.match(r"^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$", value):
+            raise ValueError(
+                r"must validate the regular expression /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/"
+            )
+        return value
+
     model_config = ConfigDict(
         populate_by_name=True,
         validate_assignment=True,