diff --git a/.github/workflows/build-neo4j-rust-ext.yml b/.github/workflows/build-neo4j-rust-ext.yml
index abf78c05abeb..d0ff4c413f1f 100644
--- a/.github/workflows/build-neo4j-rust-ext.yml
+++ b/.github/workflows/build-neo4j-rust-ext.yml
@@ -66,6 +66,10 @@ jobs:
           repository: neo4j/neo4j-python-driver-rust-ext
           ref: ${{ env.NEO4J_RUST_EXT_VERSION }}
           persist-credentials: false
+          # Since 6.4.0.0, tests/benchmarks/test_vector_benchmarks.py loads
+          # driver/tests/unit/common/vector/test_vector.py through the
+          # `driver` git submodule instead of a vendored copy.
+          submodules: true
 
       # Wheel version is `<neo4j version>.<release counter>`, e.g. 6.2.0.0 -> neo4j==6.2.0.
       - name: Derive the matching neo4j driver version
@@ -91,10 +95,12 @@ jobs:
           CIBW_TEST_ENVIRONMENT: >-
             PIP_EXTRA_INDEX_URL=https://pypi.riseproject.dev/simple/
             PIP_ONLY_BINARY=numpy,pandas,pyarrow
+          # The driver submodule's tests/_optional_deps.py imports the standalone
+          # `mock` package (not stdlib unittest.mock) unconditionally.
           CIBW_TEST_REQUIRES: >-
-            pytest pytest-mock pytest-benchmark numpy pandas pyarrow
+            pytest pytest-mock pytest-benchmark mock numpy pandas pyarrow
             neo4j==${{ env.NEO4J_VERSION }}
-          CIBW_TEST_SOURCES: tests
+          CIBW_TEST_SOURCES: tests driver
           # CONTRIBUTING.md's documented `pytest tests`, with tox.ini's own
           # `--benchmark-skip` flag to keep CI fast. The two deselected cases
           # assert an exact byte-for-byte f32 NaN payload/sign after an
diff --git a/docs/packages/neo4j-rust-ext.yaml b/docs/packages/neo4j-rust-ext.yaml
index 80fcbdce681f..8a2935d8cf67 100644
--- a/docs/packages/neo4j-rust-ext.yaml
+++ b/docs/packages/neo4j-rust-ext.yaml
@@ -38,3 +38,4 @@ versions:
   - filename: neo4j_rust_ext-6.3.1.0-cp314-cp314-manylinux_2_34_riscv64.manylinux_2_39_riscv64.whl
     sha256: 3a27d7f1b5b992e71b60146abee74ec7ae3048fea490bb95e89138e9625a51b1
     requires-python: '>=3.10'
+- version: 6.4.0.0