diff --git a/by-dataframe/dask/requirements-dev.txt b/by-dataframe/dask/requirements-dev.txt
index e03009bf..a48255d0 100644
--- a/by-dataframe/dask/requirements-dev.txt
+++ b/by-dataframe/dask/requirements-dev.txt
@@ -1,2 +1,2 @@
 pytest<9
-pytest-cov<5
+pytest-cov<6