diff --git a/pyproject.toml b/pyproject.toml
index 511b56e..b31d18f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -44,7 +44,7 @@ dev = [
     "ruff>=0.13.0,<0.15.0",
 ]
 
-langfuse = ["langfuse>=2.0.0,<3"]
+langfuse = ["langfuse>=2.0.0,<4"]
 otel = ["opentelemetry-exporter-otlp-proto-http>=1.30.0,<2.0.0"]
 
 [tool.ruff]