diff --git a/pyproject.toml b/pyproject.toml
index d108cb1..4349bba 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,7 +17,7 @@ dependencies = [
     "geopandas",
     "regionmask",
     "contourpy",
-    "sectionate >= 0.3.4"
+    "sectionate >= 0.3.4, < 0.4"
 ]
 
 [project.urls]