diff --git a/requirements-dev.txt b/requirements-dev.txt
index acb76e4..602d7cf 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -3,6 +3,7 @@ black >=22.12.0
 bump-my-version
 compas_invocations2
 compas_notebook
+compas_viewer
 invoke >=0.14
 ruff
 sphinx_compas2_theme