diff --git a/run_af2/pyproject.toml b/run_af2/pyproject.toml
index 683a1eba0a19f401943e2dbfdaa25111addb89e5..a4190d1f35c094bfc47b22a98ea85e7e976e763d 100644
--- a/run_af2/pyproject.toml
+++ b/run_af2/pyproject.toml
@@ -17,8 +17,8 @@ write_to = "src/run_af2/version.py"
 
 [build-system]
 requires = [
-    "setuptools>=56",
+    "setuptools==56",
     "wheel",
-    "setuptools_scm[toml]>=6.0"
+    "setuptools_scm==6.0"
 ]
 build-backend = "setuptools.build_meta"