diff --git a/pyproject.toml b/pyproject.toml
index 3a7da781..45accd7e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,7 +8,7 @@ dependencies = [
     "ruff>=0.11.9",
     "gymnasium>=0.26.3,<2",
     "scipy>=1.15.2,<2",
-    "crisp_python>=3.0.0,<4",
+    "crisp_python>=4.0.0,<5",
     "rich>=14.0.0, <15",
 ]
 authors = [