diff --git a/pyproject.toml b/pyproject.toml
index 5ff5fee14..381b9d7e9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -94,7 +94,7 @@ 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==1.15.0",  # 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==3.3.0",
     "dash-cytoscape==1.0.2",