diff --git a/pyproject.toml b/pyproject.toml
index c40d452..bfabdd7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,8 +19,8 @@ requires-python = ">=3.8"
 dependencies = [
     "numpy",
     "cvxpy",
-    "scikit-survival",
-    "scikit-learn",
+    "scikit-survival==0.18.0",
+    "scikit-learn==1.1.2",
     "pandas",
     "tqdm",
     "seaborn",