diff --git a/static/_headers b/static/_headers
index 53f95e1..e400e22 100644
--- a/static/_headers
+++ b/static/_headers
@@ -8,6 +8,7 @@
   X-XSS-Protection : 0
   Permissions-Policy : accelerometer=(), ambient-light-sensor=(), autoplay=(), battery=(), camera=(), clipboard-read=(), display-capture=(), document-domain=(), encrypted-media=(), fullscreen=(), geolocation=(), gyroscope=(), hid=(), idle-detection=(), interest-cohort=(), magnetometer=(), microphone=(), midi=(), payment=(), picture-in-picture=(), publickey-credentials-get=(), screen-wake-lock=(), serial=(), usb=(), sync-xhr=(), xr-spatial-tracking=()
   Cross-Origin-Resource-Policy : same-origin
+  Expect-CT: enforce, max-age=63072000
 
 /*.xml
   Content-Security-Policy : default-src 'none'; img-src 'self' data: https://www.w3.org/; style-src 'self' 'unsafe-inline'; block-all-mixed-content; base-uri 'none'