diff --git a/CHANGELOG.md b/CHANGELOG.md
index 875f51c9..df352dcf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,13 @@
 In this file noteworthy changes of new releases of pyLife are documented since
 2.0.0.
 
+## Unreleased
+
+### Minor improvments
+
+* Connectivity information is now transfered from odbserver to odbclient as
+  ints.
+
 
 ## pylife-2.1.3
 
diff --git a/tools/odbclient/src/odbclient/odbclient.py b/tools/odbclient/src/odbclient/odbclient.py
index 5efa2f14..7a142665 100644
--- a/tools/odbclient/src/odbclient/odbclient.py
+++ b/tools/odbclient/src/odbclient/odbclient.py
@@ -226,7 +226,7 @@ def element_connectivity(self, instance_name, elset_name=''):
         return pd.DataFrame(
             {
                 'connectivity': [
-                    conn[conn >= -0].astype(np.int64).tolist() for conn in connectivity
+                    conn[conn >= -0].tolist() for conn in connectivity
                 ]
             },
             index=pd.Index(index, name='element_id', dtype=np.int64),
diff --git a/tools/odbclient/tests/test_odbclient.py b/tools/odbclient/tests/test_odbclient.py
index 21665af4..edd5a775 100644
--- a/tools/odbclient/tests/test_odbclient.py
+++ b/tools/odbclient/tests/test_odbclient.py
@@ -113,6 +113,7 @@ def test_element_connectivity(client):
     expected.index.names = ["element_id"]
 
     result = client.element_connectivity('PART-1-1')
+    assert isinstance(result.loc[1, "connectivity"][0], int)
 
     pd.testing.assert_frame_equal(result, expected)
 
diff --git a/tools/odbserver/odbserver/interface.py b/tools/odbserver/odbserver/interface.py
index b8a45702..074b958e 100644
--- a/tools/odbserver/odbserver/interface.py
+++ b/tools/odbserver/odbserver/interface.py
@@ -76,8 +76,8 @@ def connectivity(self, instance_name, element_set_name):
         else:
             raise KeyError(element_set_name)
 
-        index = np.empty(len(elements), dtype=np.int)
-        connectivity = -np.ones((len(elements), 20))
+        index = np.empty(len(elements), dtype=np.int64)
+        connectivity = -np.ones((len(elements), 20), dtype=np.int64)
         for i, el in enumerate(elements):
             index[i] = el.label
             conns = list(el.connectivity)