diff --git a/bot.py b/bot.py
index 1168de0..35792d5 100644
--- a/bot.py
+++ b/bot.py
@@ -99,10 +99,14 @@ async def main():
     except FileNotFoundError:
         state = {"notified": [], "notified_soon": []}
 
+    urls = os.getenv("PISS_URLS", "").split(",")
+    if not urls:
+        raise RuntimeError("No PISS_URLS specified!")
+
     while True:
         calendars = []
         async with aiohttp.ClientSession() as session:
-            for url in config.URLS:
+            for url in urls:
                 logging.debug(f"Requesting {url}...")
                 async with session.get(url) as resp:
                     calendars.append(Calendar(await resp.text()))
diff --git a/config.py b/config.py
index 1b320b5..e7e5fb3 100644
--- a/config.py
+++ b/config.py
@@ -3,11 +3,6 @@ class Config:
     TG_API_KEY = None
     TG_CHAT_ID = None
     AVATAR_URL = 'https://gitlab.com/sdbs_cz/piss-bot/-/raw/master/piss.jpg'
-    URLS = [
-        'https://sdbs.cz/wp-content/themes/sdbs/file-download.php?type=in',
-        'https://sdbs.cz/wp-content/themes/sdbs/file-download.php?type=out',
-        'http://cloud.sdbs.cz/remote.php/dav/public-calendars/R5kWLqcrDFaQYE2e?export'
-    ]
     EVENT_TEMPLATE = "<br>".join((
         "<b>{title}</b>",
         "{date} {location}",