diff --git a/setup.py b/setup.py
index d854d41..cc9670c 100644
--- a/setup.py
+++ b/setup.py
@@ -22,7 +22,7 @@
         'numpy',
         'qastle>=0.16.0',
         'uproot>=5',
-        'vector',
+        'vector>=1.1.0',
     ],
     extras_require={'test': ['flake8', 'pytest', 'pytest-cov']},
     author='Mason Proffitt',
diff --git a/tests/test_executor.py b/tests/test_executor.py
index 71b3df1..bde9624 100644
--- a/tests/test_executor.py
+++ b/tests/test_executor.py
@@ -539,6 +539,21 @@ def test_ast_executor_tofourmomentum_mass():
     assert np.allclose(result[2].tolist(), [8.6420747579])
 
 
+def test_ast_executor_tofourmomentum_sum():
+    python_source = (
+        "Select(EventDataset('tests/four-vector_tree_file.root', 'tree'),"
+        + "lambda row: Zip({'pt': row.pt_vector_branch, 'eta': row.eta_vector_branch,"
+        + "'phi': row.phi_vector_branch, 'e': row.e_vector_branch})"
+        + ".Select(lambda four_vector: four_vector.ToFourMomentum()).Sum())"
+    )
+    python_ast = ast.parse(python_source)
+    result = ast_executor(python_ast)
+    assert np.allclose(result.pt, [0, 4.223308959107644, 11.11])
+    assert np.allclose(result.eta, [0.0, -5.135728460688669, 0.1212])
+    assert np.allclose(result.phi, [0.0, 0.37848189207358623, 3.13])
+    assert np.allclose(result.e, [0.0, 1107.9, 14.14])
+
+
 def test_ast_executor_tofourmomenta():
     python_source = (
         "Select(EventDataset('tests/four-vector_tree_file.root', 'tree'),"
@@ -579,6 +594,20 @@ def test_ast_executor_tofourmomenta_mass():
     assert np.allclose(result[2].tolist(), [8.6420747579])
 
 
+def test_ast_executor_tofourmomenta_sum():
+    python_source = (
+        "Select(EventDataset('tests/four-vector_tree_file.root', 'tree'),"
+        + "lambda row: Zip({'pt': row.pt_vector_branch, 'eta': row.eta_vector_branch,"
+        + "'phi': row.phi_vector_branch, 'e': row.e_vector_branch}).ToFourMomenta().Sum())"
+    )
+    python_ast = ast.parse(python_source)
+    result = ast_executor(python_ast)
+    assert np.allclose(result.pt, [0, 4.223308959107644, 11.11])
+    assert np.allclose(result.eta, [0.0, -5.135728460688669, 0.1212])
+    assert np.allclose(result.phi, [0.0, 0.37848189207358623, 3.13])
+    assert np.allclose(result.e, [0.0, 1107.9, 14.14])
+
+
 # def test_ast_executor_orderby_same_scalar_branch():
 #     python_source = (
 #         "OrderBy(EventDataset('tests/scalars_tree_file.root', 'tree'),"