diff --git a/.github/workflows/pypi-tests.yml b/.github/workflows/pypi-tests.yml
index 49d09f4e..61b8979e 100644
--- a/.github/workflows/pypi-tests.yml
+++ b/.github/workflows/pypi-tests.yml
@@ -35,6 +35,7 @@ jobs:
         pip install pip wheel -U
         pip install dask[array,dataframe,distributed,diagnostics]
         pip install -q --no-cache-dir .[complete,test]
+        pip install git+https://github.com/martindurant/dask-histogram@sizeof
         pip list
     - name: test
       run: |