diff --git a/action/main.py b/action/main.py
index 14a3e5f..f7b23fb 100644
--- a/action/main.py
+++ b/action/main.py
@@ -24,8 +24,9 @@ req = f"ruff{version_specifier}"
 
 # If CHANGED_FILES is not empty, split it into a list; otherwise, use SRC
 files_to_check = shlex.split(CHANGED_FILES or SRC)
+# Exclude non-Python files
+files_to_check = [f for f in files_to_check if f.endswith(".py")]
 
 proc = run(["pipx", "run", req, *shlex.split(ARGS), *files_to_check])
-# proc = run(["pipx", "run", req, *shlex.split(ARGS), *shlex.split(SRC)])
 
 sys.exit(proc.returncode)