diff --git a/pyproject.toml b/pyproject.toml
index 0065a39..5c5db3d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -20,6 +20,7 @@ classifiers = [
 ]
 dependencies = [
   "fmriprep",
+  "matplotlib <= 3.8",
   "nipype >= 1.8.5",
   "nireports",
   "niworkflows",