diff --git a/tests/e2e/adcp_schema_validator.py b/tests/e2e/adcp_schema_validator.py
index 2b8a4f3b4..73cebde90 100644
--- a/tests/e2e/adcp_schema_validator.py
+++ b/tests/e2e/adcp_schema_validator.py
@@ -174,6 +174,7 @@ async def _download_schema_index(self) -> dict[str, Any]:
             # Save to cache
             with open(cache_path, "w") as f:
                 json.dump(index_data, f, indent=2)
+                f.write("\n")  # Add trailing newline for pre-commit compatibility
 
             # Save new metadata
             metadata = {
@@ -183,6 +184,7 @@ async def _download_schema_index(self) -> dict[str, Any]:
             }
             with open(meta_path, "w") as f:
                 json.dump(metadata, f, indent=2)
+                f.write("\n")  # Add trailing newline for pre-commit compatibility
 
             return index_data
 
@@ -256,6 +258,7 @@ async def _download_schema(self, schema_ref: str) -> dict[str, Any]:
             # Save to cache
             with open(cache_path, "w") as f:
                 json.dump(schema_data, f, indent=2)
+                f.write("\n")  # Add trailing newline for pre-commit compatibility
 
             # Save new metadata
             metadata = {
@@ -266,6 +269,7 @@ async def _download_schema(self, schema_ref: str) -> dict[str, Any]:
             }
             with open(meta_path, "w") as f:
                 json.dump(metadata, f, indent=2)
+                f.write("\n")  # Add trailing newline for pre-commit compatibility
 
             return schema_data