diff --git a/poly_matrix b/poly_matrix
index cf91381..919d94f 160000
--- a/poly_matrix
+++ b/poly_matrix
@@ -1 +1 @@
-Subproject commit cf913811979b22a43b8e117ec6e4cb18768b9cd5
+Subproject commit 919d94fc5f79dcd8ba636b2e7c412b06ac3b8f09
diff --git a/setup.cfg b/setup.cfg
index db6931d..914e30a 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -20,5 +20,5 @@ exclude=tests*
 
 [flake8]
 ignore = W292, W391, F541, F841, E203, E501, W503, E741
-exclude = _notebooks/*, *.ipynb_checkpoints*
+exclude = _notebooks/*, *.ipynb_checkpoints*, venv/
 max-line-length = 99