diff --git a/src/funlib/persistence/graphs/sql_graph_database.py b/src/funlib/persistence/graphs/sql_graph_database.py
index 5cb511d..e1c0811 100644
--- a/src/funlib/persistence/graphs/sql_graph_database.py
+++ b/src/funlib/persistence/graphs/sql_graph_database.py
@@ -2,6 +2,7 @@
 from abc import abstractmethod
 from typing import Any, Iterable, Optional
 
+import numpy as np
 from funlib.geometry import Coordinate, Roi
 from networkx import DiGraph, Graph
 from networkx.classes.reportviews import NodeView, OutEdgeView
@@ -704,10 +705,22 @@ def update_nodes(
                     )
                     continue
 
-            values = [data.get(attr) for attr in attrs]
-            setters = [
-                f"{k} = {self.__convert_to_sql(v)}" for k, v in zip(attrs, values)
-            ]
+            setters = []
+            for attr in attrs:
+                value = data.get(attr)
+                columns = self._node_attrs_to_columns([attr])
+                if len(columns) == 1:
+                    setters.append(f"{columns[0]} = {self.__convert_to_sql(value)}")
+                else:
+                    # attr is stored across multiple columns (e.g. a Vec in the
+                    # SQLite backend -> attr_0, attr_1, ...); expand the value to
+                    # one assignment per column instead of writing the whole
+                    # sequence into a single column (which produced invalid SQL).
+                    components = [None] * len(columns) if value is None else list(value)
+                    setters.extend(
+                        f"{col} = {self.__convert_to_sql(component)}"
+                        for col, component in zip(columns, components)
+                    )
             update_statement = (
                 f"UPDATE {self.nodes_table_name} SET "
                 f"{', '.join(setters)} WHERE "
@@ -806,12 +819,22 @@ def __get_node_pos(self, n: dict[str, Any]) -> Optional[Coordinate]:
             return None
 
     def __convert_to_sql(self, x: Any) -> str:
+        # normalize numpy values to their native python equivalents; all
+        # other types pass through untouched
+        if isinstance(x, np.ndarray):
+            x = x.tolist()
+        elif isinstance(x, np.generic):
+            x = x.item()
         if isinstance(x, str):
             return f"'{x}'"
         elif x is None:
             return "null"
         elif isinstance(x, bool):
             return f"{x}".lower()
+        elif isinstance(x, (list, tuple)):
+            # a native array column (e.g. a Vec stored as a single array column
+            # in the PostgreSQL backend) -> array literal '{v0,v1,...}'
+            return "'{" + ",".join(map(str, x)) + "}'"
         else:
             return str(x)
 
diff --git a/tests/test_graph.py b/tests/test_graph.py
index eef1e4e..858dd76 100644
--- a/tests/test_graph.py
+++ b/tests/test_graph.py
@@ -1,4 +1,5 @@
 import networkx as nx
+import numpy as np
 import pytest
 from funlib.geometry import Roi
 
@@ -180,6 +181,44 @@ def test_graph_read_and_update_specific_attrs(provider_factory):
             assert data["c"] == 5
 
 
+def test_graph_update_vector_node_attr(provider_factory):
+    # Regression: update_nodes must handle a Vec (multi-column) node attribute,
+    # not just scalars. Previously the SQLite backend emitted
+    # `UPDATE nodes SET embedding = [1.0, 2.0, 3.0]` (invalid SQL) because it
+    # wrote the whole sequence into one column instead of expanding to the
+    # per-dimension columns (embedding_0, embedding_1, ...).
+    roi = Roi((0, 0, 0), (10, 10, 10))
+    graph = nx.Graph()
+    graph.add_node(7, position=(5, 5, 5), embedding=[0.0, 0.0, 0.0], score=0.0)
+
+    with provider_factory(
+        "w",
+        node_attrs={
+            "position": Vec(float, 3),
+            "embedding": Vec(float, 3),
+            "score": float,
+        },
+    ) as gp:
+        gp.write_graph(graph)
+
+    with provider_factory("r+") as gp:
+        g = gp.read_graph(roi)
+        # numpy values (the typical case, e.g. embeddings computed with numpy)
+        # must be normalized to native python on their way into the SQL
+        # statement, for arrays and scalars alike
+        g.nodes[7]["embedding"] = np.array([1.0, 2.0, 3.0])
+        g.nodes[7]["score"] = np.float64(0.5)
+        try:
+            gp.update_nodes(g.nodes, roi=roi, attributes=["embedding", "score"])
+        except NotImplementedError:
+            pytest.xfail()
+
+    with provider_factory("r") as gp:
+        updated = gp.read_graph(roi)
+        assert list(updated.nodes[7]["embedding"]) == [1.0, 2.0, 3.0]
+        assert updated.nodes[7]["score"] == 0.5
+
+
 def test_graph_read_unbounded_roi(provider_factory, write_method):
     unbounded_roi = Roi((None, None, None), (None, None, None))
     graph = nx.Graph()