diff --git a/mlos_core/setup.py b/mlos_core/setup.py
index e4c792e270..65c586a8f6 100644
--- a/mlos_core/setup.py
+++ b/mlos_core/setup.py
@@ -97,7 +97,7 @@ def _get_long_desc_from_readme(base_url: str) -> dict:
         'pandas >= 2.2.0;python_version>="3.9"',
         'Bottleneck > 1.3.5;python_version>="3.9"',
         'pandas >= 1.0.3;python_version<"3.9"',
-        "ConfigSpace==0.7.1",  # Temporarily restrict ConfigSpace version.
+        "ConfigSpace==1.2.0",  # Temporarily restrict ConfigSpace version.
     ],
     extras_require=extra_requires,
     **_get_long_desc_from_readme("https://github.com/microsoft/MLOS/tree/main/mlos_core"),