diff --git a/pyproject.toml b/pyproject.toml
index 24ab312..f1f5539 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -38,7 +38,7 @@ classifiers = [
 dependencies = [
     "htmltools",
     "databackend",
-    "ipyreact",
+    "ipyreact<=0.4.1",
     "IPython",
     "importlib-metadata",
     "importlib-resources",
@@ -101,4 +101,4 @@ markers = [
 ]
 
 [tool.black]
-line-length = 100
\ No newline at end of file
+line-length = 100