diff --git a/nortech/derivers/handlers/deriver.py b/nortech/derivers/handlers/deriver.py
index 25f9d23..110d658 100644
--- a/nortech/derivers/handlers/deriver.py
+++ b/nortech/derivers/handlers/deriver.py
@@ -81,12 +81,12 @@ def visualize_deriver(deriver: Deriver):
 
     for input_name, deriver_input in deriver.inputs.items():
         mermaid += f"""
-            {sha256(deriver.name.encode()).hexdigest()[:8]}_{deriver_input.signal}["{deriver_input.signal}<br/>[{deriver_input.physical_unit.symbol.replace(' ', '')}]"] --> {sha256(deriver_schema_dag.name.encode()).hexdigest()[:8]}_{input_name}
+            {sha256(deriver.name.encode()).hexdigest()[:8]}_{deriver_input.signal}["{deriver_input.signal}<br/>[{deriver_input.physical_unit.symbol.replace(" ", "")}]"] --> {sha256(deriver_schema_dag.name.encode()).hexdigest()[:8]}_{input_name}
         """
 
     for output_name, deriver_output in deriver.outputs.items():
         mermaid += f"""
-            {sha256(deriver_schema_dag.name.encode()).hexdigest()[:8]}_{output_name} --> {sha256(deriver.name.encode()).hexdigest()[:8]}_{output_name}["{output_name}<br/>[{deriver_output.physical_unit.symbol.replace(' ', '')}]"]
+            {sha256(deriver_schema_dag.name.encode()).hexdigest()[:8]}_{output_name} --> {sha256(deriver.name.encode()).hexdigest()[:8]}_{output_name}["{output_name}<br/>[{deriver_output.physical_unit.symbol.replace(" ", "")}]"]
         """
 
     mermaid += """
diff --git a/nortech/derivers/services/nortech_api.py b/nortech/derivers/services/nortech_api.py
index 4004515..031339e 100644
--- a/nortech/derivers/services/nortech_api.py
+++ b/nortech/derivers/services/nortech_api.py
@@ -95,13 +95,13 @@ class Schema(BaseModel):
 
 
 class SchemaDiff(BaseModel):
-    old: Schema = Field(..., alias="previousSchema")
+    old: Schema | None = Field(None, alias="previousSchema")
     new: Schema = Field(..., alias="newSchema")
 
 
 class DeriverDiffs(BaseModel):
-    deriver_schemas: Mapping[str, SchemaDiff] = Field(..., alias="deriverSchemas")
-    derivers: Mapping[str, SchemaDiff]
+    deriver_schemas: Mapping[str, SchemaDiff] = Field(..., alias="DeriverSchemas")
+    derivers: Mapping[str, SchemaDiff] = Field(..., alias="Derivers")
 
     model_config = ConfigDict(populate_by_name=True)
 
diff --git a/nortech/gateways/nortech_api.py b/nortech/gateways/nortech_api.py
index a611a75..569f5d8 100644
--- a/nortech/gateways/nortech_api.py
+++ b/nortech/gateways/nortech_api.py
@@ -16,7 +16,7 @@ class NortechAPISettings(BaseSettings):
 
     URL: str = Field(default="https://api.apps.nor.tech")
     KEY: str = Field(default=...)
-    USER_AGENT: str = Field(default="nortech-python/0.9.2")
+    USER_AGENT: str = Field(default="nortech-python/0.9.3")
     IGNORE_PAGINATION: bool = True
     EXPERIMENTAL_FEATURES: bool = False
     TIMEOUT: float | Timeout = Field(default=Timeout(connect=10, read=60))
diff --git a/pyproject.toml b/pyproject.toml
index 08d8591..30a6844 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "nortech"
-version = "0.9.2"
+version = "0.9.3"
 description = "The official Python library for Nortech AI"
 authors = [
     { name = "Nortech AI", email = "info@nortech.ai" }
@@ -69,6 +69,7 @@ select = [
     "W",  # PEP 8 warning codes
 ]
 ignore = [
+    "A005",   # Module `signal` shadows a Python standard-library module
     "D100",   # Missing docstring in public module
     "D101",   # Missing docstring in public class	
     "D102",   # Missing docstring in public method
diff --git a/tests/integration/derivers/test_deriver.py b/tests/integration/derivers/test_deriver.py
index c97016d..2e0a385 100644
--- a/tests/integration/derivers/test_deriver.py
+++ b/tests/integration/derivers/test_deriver.py
@@ -267,8 +267,8 @@ def transform_stream(
 
 def test_deriver_deploy(nortech: Nortech, requests_mock: Mocker):
     mock_response_data = {
-        "deriverSchemas": {},
-        "derivers": {},
+        "DeriverSchemas": {},
+        "Derivers": {},
     }
 
     requests_mock.post(
diff --git a/tests/unit/derivers/test_deriver_diffs.py b/tests/unit/derivers/test_deriver_diffs.py
index 37ea2b4..157c716 100644
--- a/tests/unit/derivers/test_deriver_diffs.py
+++ b/tests/unit/derivers/test_deriver_diffs.py
@@ -12,12 +12,13 @@ def test_deriver_diffs():
         "updatedAt": datetime(2023, 1, 2),
     }
     test_deriver_diffs_dict = {
-        "deriverSchemas": {"schema1": {"previousSchema": test_schema, "newSchema": test_schema}},
-        "derivers": {"deriver1": {"previousSchema": test_schema, "newSchema": test_schema}},
+        "DeriverSchemas": {"schema1": {"previousSchema": test_schema, "newSchema": test_schema}},
+        "Derivers": {"deriver1": {"previousSchema": test_schema, "newSchema": test_schema}},
     }
 
     deriver_diffs = DeriverDiffs.model_validate(test_deriver_diffs_dict)
 
+    assert deriver_diffs.deriver_schemas["schema1"].old is not None
     assert deriver_diffs.deriver_schemas["schema1"].old.id == 123
     assert deriver_diffs.deriver_schemas["schema1"].old.hash == "abc123"
     assert deriver_diffs.deriver_schemas["schema1"].old.history_id == 456