diff --git a/pyproject.toml b/pyproject.toml
index 579538438beea2e75d64651da8499fe248c2d93b..4adef759cea3f7d76fcd90ed917212c242e4406f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,5 +34,10 @@ dependencies = [
     "PIMS >= 0.5.0"
 ]
 
+[project.optional-dependencies]
+test = [
+    "pytest"
+]
+
 [tool.setuptools_scm]
 write_to = "src/zolfa/nd2reader/version.py"