diff --git a/.github/workflows/build-pygeohash.yml b/.github/workflows/build-pygeohash.yml
index 3c6129d448..3ec2858971 100644
--- a/.github/workflows/build-pygeohash.yml
+++ b/.github/workflows/build-pygeohash.yml
@@ -75,6 +75,9 @@ jobs:
           # `benchmark` extra's comparison libraries have no riscv64 wheel, but
           # test_benchmark_comparison.py drops each one that fails to import.
           CIBW_TEST_REQUIRES: pytest pytest-cov pytest-benchmark pandas
+          # gotcha 354: unpinned pandas resolves to a newer PyPI release with no
+          # riscv64 wheel, source-building for ~1h and hitting the job timeout.
+          CIBW_TEST_ENVIRONMENT: PIP_PREFER_BINARY=1
           # The repo-root pygeohash/ would otherwise shadow the installed wheel's
           # compiled extension; examples/ is needed too, since test_examples.py
           # imports it directly.
diff --git a/docs/packages/pygeohash.yaml b/docs/packages/pygeohash.yaml
index 8ff78b1e47..017d8a158f 100644
--- a/docs/packages/pygeohash.yaml
+++ b/docs/packages/pygeohash.yaml
@@ -17,3 +17,4 @@ versions:
   - filename: pygeohash-3.3.2-cp314-cp314t-manylinux_2_31_riscv64.manylinux_2_39_riscv64.whl
     sha256: e23b5e849b10a8bdacc4f980be202bff8a1acf09fba121f3bac0135f35542fe5
     requires-python: '>=3.8'
+- version: 3.5.1