diff --git a/pyproject.toml b/pyproject.toml
index f0f4822d6..b3e923975 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -83,7 +83,7 @@ dev = [
     "ruff==0.13.0",
     "pre-commit==4.3.0",
     "pyvis==0.3.2",
-    "tsam==2.3.1",
+    "tsam==2.3.9",
     "scipy==1.15.1",
     "gurobipy==12.0.3",
     "dash==3.0.0",