diff --git a/pyproject.toml b/pyproject.toml
index 538f08db153ff..11647b234ae98 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -60,7 +60,6 @@ classifiers = [
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
     "Topic :: System :: Monitoring",
-    "Topic :: System :: Monitoring",
 ]
 
 # Version is defined in src/airflow/__init__.py and it is automatically synchronized by prek