diff --git a/Dockerfile b/Dockerfile
index 92a6215..6bd63ce 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 FROM luzifer/alpine-nginx-php
 
-ENV WP_VERSION=5.8.3 \
-    WP_CHECKSUM=0994f7377b2989f542e6ba0b84e1e8222613c85519eec7e3d9862e690def22b3
+ENV WP_VERSION=5.9 \
+    WP_CHECKSUM=972d48f95274859b513607ad686a0ac4278fd4ac1522c19a8efed65a549acc0b
 
 COPY rootfs /
 RUN set -ex && /usr/local/bin/container-setup