diff --git a/docs/book/book/generator/coptic_mega_translator.py b/docs/book/book/generator/coptic_mega_translator.py
index 41a15f7e3f..1b1f8d3cb4 100644
--- a/docs/book/book/generator/coptic_mega_translator.py
+++ b/docs/book/book/generator/coptic_mega_translator.py
@@ -10,7 +10,9 @@
 import urllib.request
 from concurrent.futures import ThreadPoolExecutor, as_completed
 
-DEEPSEEK_API_KEY = "sk-045135746e63422daac74a1a9f74e31f"
+DEEPSEEK_API_KEY = os.environ.get("DEEPSEEK_API_KEY", "").strip()
+if not DEEPSEEK_API_KEY:
+    raise RuntimeError("Set DEEPSEEK_API_KEY before running the translator")
 DEEPSEEK_URL = "https://api.deepseek.com/v1/chat/completions"
 OUTPUT_DIR = "/workspaces/vibee-lang/book/output/translations"