diff --git a/directory.json b/directory.json
index 142ef09..97121e7 100644
--- a/directory.json
+++ b/directory.json
@@ -161,7 +161,7 @@
   "SoMakeIt": "https://members.somakeit.org.uk/api/spaceapi",
   "Stockholm Makerspace": "https://raw.githubusercontent.com/makerspace/spaceapi/main/spaceapi.json",
   "Spline": "https://iot.spline.de/api/status.json",
-  "Stratum 0": "http://status.stratum0.org/status.json",
+  "Stratum 0": "https://status.stratum0.org/status.json",
   "Subraum (C3PB, Paderborn)": "https://c3pb.de/uptime.json",
   "Sudo Room": "http://api.sudoroom.org/status.json",
   "Swansea Hackspace": "http://swansea.hackspace.org.uk/spaceapi.php",