diff --git a/Support/ceptr/pyproject.toml b/Support/ceptr/pyproject.toml
index 8c2a66cd8..66bbd3560 100644
--- a/Support/ceptr/pyproject.toml
+++ b/Support/ceptr/pyproject.toml
@@ -30,6 +30,7 @@ pep8-naming = "^0.12.1"
 flake8-docstrings = "^1.7.0"
 flake8-use-fstring = "^1.4"
 flynt = "^0.77"
+clang-format = "==17.0.6"
 
 [build-system]
 requires = ["poetry-core>=1.0.0"]