diff --git a/pyproject.toml b/pyproject.toml
index d9f6bc18b..1e4af094e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -96,7 +96,7 @@ dev = [
     "pre-commit==4.6.0",
     "pyvis==0.3.2",
     "scipy==1.16.3",  # 1.16.1+ required for Python 3.14 wheels
-    "highspy==1.13.1",  # Latest known-good. Bump once HiGHS#2975 fix ships in 1.14.1+
+    "highspy==1.15.1",  # Latest known-good. Bump once HiGHS#2975 fix ships in 1.14.1+
     "gurobipy==12.0.3; python_version < '3.14'",  # No Python 3.14 wheels yet
     "dash==4.4.0",
     "dash-cytoscape==1.0.2",