diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index b7473612..7456ab05 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -12,11 +12,11 @@ repos:
     hooks:
       - id: isort
   - repo: https://github.com/psf/black
-    rev: 22.6.0
+    rev: 22.10.0
     hooks:
       - id: black
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v0.971
+    rev: v0.982
     hooks:
       - id: mypy
   - repo: local
diff --git a/pyproject.toml b/pyproject.toml
index 669f3de2..2451b89b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,7 @@ classifiers=[
 ]
 requires-python = ">=3.9"
 dependencies = [
-    "numpy",
+    "numpy>=1.20",
     "openpyxl",
     "pandas",
     "power_grid_model>=1.4",
diff --git a/src/power_grid_model_io/converters/tabular_converter.py b/src/power_grid_model_io/converters/tabular_converter.py
index 439718c4..02234f64 100644
--- a/src/power_grid_model_io/converters/tabular_converter.py
+++ b/src/power_grid_model_io/converters/tabular_converter.py
@@ -290,7 +290,8 @@ def _merge_pgm_data(self, data: Dict[str, List[np.ndarray]]) -> Dict[str, np.nda
 
             # If there are numtiple arrays, concatenate them
             elif len(data_set) > 1:
-                merged[component_name] = np.concatenate(data_set)
+                # pylint: disable=unexpected-keyword-arg
+                merged[component_name] = np.concatenate(data_set, dtype=data_set[0].dtype)
 
         return merged