diff --git a/tests/conftest.py b/tests/conftest.py
index 3725363..6fe4d08 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -69,12 +69,27 @@ def node_output_info() -> NodeOutputInfo:
 
 
 @pytest.fixture
-def node_requirements_info_data() -> dict:
+def node_requirements_info_data(
+    node_requirements_info_min_data: dict[str, int],
+) -> dict[str, bool | int]:
     """
     Some data to define a NodeRequirementsInfo object.
     """
 
-    return {"cpu": 256, "gpu": True, "memory": 512, "timeout": 60}
+    return {
+        "cpu": 256,
+        "gpu": True,
+        "memory": 512,
+        **node_requirements_info_min_data,
+    }
+
+
+@pytest.fixture
+def node_requirements_info_min_data() -> dict[str, int]:
+    """Minimum data to build a `NodeRequirementsInfo` instance."""
+    return {
+        "timeout": 60,
+    }
 
 
 @pytest.fixture
diff --git a/tests/test_node_info.py b/tests/test_node_info.py
index fc33e88..b910067 100644
--- a/tests/test_node_info.py
+++ b/tests/test_node_info.py
@@ -206,7 +206,28 @@ def test_node_requirements_info(node_requirements_info_data: dict):
     assert node_requirements_info.model_dump() == node_requirements_info_data
 
 
-@pytest.mark.parametrize("field", ["cpu", "gpu", "memory", "timeout"])
+def test_node_requirements_info_min(
+    node_requirements_info_min_data: dict[str, Any],
+) -> None:
+    """
+    Asserts that `NodeRequirementsInfo` can be instantiated without
+    optional values.
+    """
+    instance = NodeRequirementsInfo(**node_requirements_info_min_data)
+    assert instance.model_dump() == {
+        "cpu": None,
+        "gpu": None,
+        "memory": None,
+        **node_requirements_info_min_data,
+    }
+
+
+@pytest.mark.parametrize(
+    "field",
+    [
+        "timeout",
+    ],
+)
 def test_node_requirements_info_raise_missing(
     node_requirements_info_data: dict, field: str
 ):
diff --git a/uncertainty_engine_types/node_info.py b/uncertainty_engine_types/node_info.py
index 6ad2ef5..9f68d49 100644
--- a/uncertainty_engine_types/node_info.py
+++ b/uncertainty_engine_types/node_info.py
@@ -21,9 +21,9 @@ class NodeOutputInfo(BaseModel):
 
 
 class NodeRequirementsInfo(BaseModel):
-    cpu: int
-    gpu: bool
-    memory: int
+    cpu: int | None = None
+    gpu: bool | None = None
+    memory: int | None = None
     timeout: int