diff --git a/Dockerfile b/Dockerfile
--- a/Dockerfile
+++ b/Dockerfile
@@ -9,8 +9,8 @@
 # Prepare the container
 #
 
-ENV PHP_VERSION 7.4.23
-ENV ONIGURAMA_VERSION 6.9.7.1
+ENV PHP_VERSION 8.1.5
+ENV ONIGURAMA_VERSION 6.9.8
 ENV PHP_INI_DIR /usr/local/etc/php
 ENV PHP_BUILD_DEPS bzip2 \
 		file \
@@ -36,8 +36,9 @@
     && dpkg-reconfigure locales
 
 RUN gpg --keyserver keyserver.ubuntu.com --recv-keys \
-	5A52880781F755608BF815FC910DEB46F53EA312 \
-	42670A7FE4D0441C8E4632349E4FDC074A4EF02D \
+	39B641343D8C104B2B146DC3F9C39DC0B9698544 \
+	F1F692238FBC1666E5A5CCD4199F9DFEF6FFBAFD \
+	528995BFEDFBA7191D46839EF9BA0ADA31CBD89E \
 	&& mkdir -p $PHP_INI_DIR/conf.d \
 	&& set -x \
 	&& curl -SL "http://php.net/get/php-$PHP_VERSION.tar.bz2/from/this/mirror" -o php.tar.bz2 \