diff --git a/appabuild/config/lca.py b/appabuild/config/lca.py
index fb95343..3c9a0d3 100644
--- a/appabuild/config/lca.py
+++ b/appabuild/config/lca.py
@@ -23,6 +23,10 @@ def parse_param(param: dict) -> ImpactModelParam:
     :param param: dict containing the elements needed to build an ImpactModelParam.
     :return: constructed ImpactModelParam.
     """
+    if "default" not in param:
+        raise PydanticCustomError(
+            "key_error", "Missing field type for a parameter", {"field": "default"}
+        )
     try:
         return ImpactModelParam.from_dict(param)
     except KeyError:
diff --git a/pyproject.toml b/pyproject.toml
index a43a0ce..0c03c3c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -42,7 +42,7 @@ dependencies = [
     "kaleido",
     "tqdm",
     "ruamel.yaml",
-    "apparun==0.3.5",
+    "apparun==0.3.6",
     "typer==0.15.1",
     "ipython>=7.6.0,<=8.34.0",
     "mermaid-py==0.7.1"
diff --git a/requirements.txt b/requirements.txt
index 0390429..6a58470 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,7 +20,7 @@ aenum
 kaleido
 tqdm
 ruamel.yaml
-apparun==0.3.5
+apparun==0.3.6
 ipython>=7.6.0,<=8.34.0
 pre-commit
 hatchling