diff --git a/prowler/providers/gcp/models.py b/prowler/providers/gcp/models.py
index a6d925fd2f..491fe896d1 100644
--- a/prowler/providers/gcp/models.py
+++ b/prowler/providers/gcp/models.py
@@ -18,7 +18,7 @@ class GCPOrganization(BaseModel):
 
 
 class GCPProject(BaseModel):
-    number: str
+    number: int
     id: str
     name: str
     organization: Optional[GCPOrganization] = None
diff --git a/prowler/providers/gcp/services/cloudstorage/cloudstorage_service.py b/prowler/providers/gcp/services/cloudstorage/cloudstorage_service.py
index 0e2e74d27c..317d30217b 100644
--- a/prowler/providers/gcp/services/cloudstorage/cloudstorage_service.py
+++ b/prowler/providers/gcp/services/cloudstorage/cloudstorage_service.py
@@ -60,4 +60,4 @@ class Bucket(BaseModel):
     uniform_bucket_level_access: bool
     public: bool
     project_id: str
-    retention_policy: Optional[dict]
+    retention_policy: Optional[dict] = None
diff --git a/prowler/providers/gcp/services/kms/kms_service.py b/prowler/providers/gcp/services/kms/kms_service.py
index 3ac498d2ba..77a4c0c427 100644
--- a/prowler/providers/gcp/services/kms/kms_service.py
+++ b/prowler/providers/gcp/services/kms/kms_service.py
@@ -143,8 +143,8 @@ class CriptoKey(BaseModel):
     id: str
     name: str
     location: str
-    rotation_period: Optional[str]
-    next_rotation_time: Optional[str]
+    rotation_period: Optional[str] = None
+    next_rotation_time: Optional[str] = None
     key_ring: str
     members: list = []
     project_id: str
diff --git a/tests/providers/gcp/lib/mutelist/gcp_mutelist_test.py b/tests/providers/gcp/lib/mutelist/gcp_mutelist_test.py
index 0471c5f0f1..ced1fcc2c6 100644
--- a/tests/providers/gcp/lib/mutelist/gcp_mutelist_test.py
+++ b/tests/providers/gcp/lib/mutelist/gcp_mutelist_test.py
@@ -89,7 +89,7 @@ class TestGCPMutelist:
             account_uid="project_1",
             region="test-region",
             resource_uid="test_resource",
-            resource_tags=[],
+            resource_tags={},
             muted=False,
         )
 
diff --git a/tests/providers/gcp/services/iam/iam_service_account_unused/iam_service_account_unused_test.py b/tests/providers/gcp/services/iam/iam_service_account_unused/iam_service_account_unused_test.py
index d76200734d..a50e1f80e4 100644
--- a/tests/providers/gcp/services/iam/iam_service_account_unused/iam_service_account_unused_test.py
+++ b/tests/providers/gcp/services/iam/iam_service_account_unused/iam_service_account_unused_test.py
@@ -96,7 +96,7 @@ class Test_iam_service_account_unused:
             assert result[0].resource_id == iam_client.service_accounts[0].email
             assert result[0].project_id == GCP_PROJECT_ID
             assert result[0].location == GCP_US_CENTER1_LOCATION
-            assert result[0].resource == iam_client.service_accounts[0]
+            assert result[0].resource == iam_client.service_accounts[0].model_dump()
 
     def test_iam_service_account_unused_mix(self):
         iam_client = mock.MagicMock()
@@ -168,7 +168,7 @@ class Test_iam_service_account_unused:
             assert result[0].resource_id == iam_client.service_accounts[0].email
             assert result[0].project_id == GCP_PROJECT_ID
             assert result[0].location == GCP_US_CENTER1_LOCATION
-            assert result[0].resource == iam_client.service_accounts[0]
+            assert result[0].resource == iam_client.service_accounts[0].model_dump()
 
             assert result[1].status == "FAIL"
             assert (
@@ -178,4 +178,4 @@ class Test_iam_service_account_unused:
             assert result[1].resource_id == iam_client.service_accounts[1].email
             assert result[1].project_id == GCP_PROJECT_ID
             assert result[1].location == GCP_US_CENTER1_LOCATION
-            assert result[1].resource == iam_client.service_accounts[1]
+            assert result[1].resource == iam_client.service_accounts[1].model_dump()