diff --git a/pyproject.toml b/pyproject.toml
index 71edaba..fe7f64f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -31,7 +31,7 @@ dependencies = [
 'graphviz',
 'xradio',
 'python_casacore>=3.5.2; sys_platform != "darwin" ',
-ipympl
+'ipympl'
 ]