diff --git a/Dockerfile b/Dockerfile
index 5cb00d7..e5fb955 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,34 +1,34 @@
-FROM alpine:3.14
+FROM alpine:3.17
 
 LABEL maintainer="selim013@gmail.com"
 
 RUN apk add --no-cache curl \
     imagemagick \
     apache2 \
-    php8 \
-    php8-apache2 \
-    php8-ctype \
-    php8-curl \
-    php8-dom \
-    php8-ftp \
-    php8-gd \
-    php8-iconv \
-    php8-json \
-    php8-mbstring \
-    php8-mysqli \
-    php8-opcache \
-    php8-openssl \
-    php8-pgsql \
-    php8-sqlite3 \
-    php8-tokenizer \
-    php8-xml \
-    php8-zlib \
-    php8-zip \
+    php81 \
+    php81-apache2 \
+    php81-ctype \
+    php81-curl \
+    php81-dom \
+    php81-ftp \
+    php81-gd \
+    php81-iconv \
+    php81-json \
+    php81-mbstring \
+    php81-mysqli \
+    php81-opcache \
+    php81-openssl \
+    php81-pgsql \
+    php81-sqlite3 \
+    php81-tokenizer \
+    php81-xml \
+    php81-zlib \
+    php81-zip \
     su-exec
 
 ### phpBB
-ENV PHPBB_VERSION 3.3.4
-ENV PHPBB_SHA256 'a2436e375acf9ec8846fda82ffeda51774627967308fb3b71d395b90a1acfe8b'
+ENV PHPBB_VERSION 3.3.9
+ENV PHPBB_SHA256 8eacc10caff2327d51019ed2677b55ff1afdc68a3a7aaeee9ac29747775fe04f
 
 WORKDIR /tmp
 
@@ -48,11 +48,8 @@ RUN mkdir -p /run/apache2 /phpbb/opcache \
 
 COPY apache2/httpd.conf /etc/apache2/
 COPY apache2/conf.d/* /etc/apache2/conf.d/
-
-COPY php/php.ini /etc/php7/
-COPY php/php-cli.ini /etc/php7/
-COPY php/conf.d/* /etc/php7/conf.d/
-
+COPY php/php.ini php/php-cli.ini /etc/php81/
+COPY php/conf.d/* /etc/php81/conf.d
 COPY start.sh /usr/local/bin/
 
 RUN chown -R apache:apache /phpbb
diff --git a/docker-compose.build.yml b/docker-compose.build.yml
index 839387a..1ef4013 100644
--- a/docker-compose.build.yml
+++ b/docker-compose.build.yml
@@ -1,4 +1,8 @@
-version: '2'
+volumes:
+  phpbb-sqlite: {}
+  phpbb-files: {}
+  phpbb-store: {}
+  phpbb-avatars: {}
 
 services:
   phpbb:
@@ -6,9 +10,9 @@ services:
     ports:
       - '127.0.0.1:8000:80'
     volumes:
-      - '/phpbb/sqlite'
-      - '/phpbb/www/files'
-      - '/phpbb/www/store'
-      - '/phpbb/www/images/avatars/upload'
+      - 'phpbb-sqlite:/phpbb/sqlite'
+      - 'phpbb-files:/phpbb/www/files'
+      - 'phpbb-store:/phpbb/www/store'
+      - 'phpbb-avatars:/phpbb/www/images/avatars/upload'
     environment:
       PHPBB_INSTALL: 'true'
\ No newline at end of file
diff --git a/docker-compose.yml b/docker-compose.yml
index cbe82d7..4d849f9 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,5 +1,3 @@
-version: '2'
-
 volumes:
   phpbb-sqlite: {}
   phpbb-files: {}
diff --git a/update.sh b/update.sh
new file mode 100755
index 0000000..8f4a41b
--- /dev/null
+++ b/update.sh
@@ -0,0 +1,31 @@
+#!/bin/bash
+
+set -e
+
+VERSION="$1"
+
+if [ ! -n "$VERSION" ]; then
+    echo "Usage: $0 phpbb_minor_version"
+    echo
+    echo "Example: $0 3.3"
+    exit 1
+fi
+
+VERSIONS_URL="http://version.phpbb.com/phpbb/versions.json"
+LATEST_VERSION=$(curl --silent --location $VERSIONS_URL | jq --raw-output ".stable[\"$VERSION\"].current")
+if [ "$LATEST_VERSION" == "null" ]; then
+    echo "PHPBB version not found"
+    exit 1
+fi
+
+SHA_URL="https://download.phpbb.com/pub/release/3.3/$LATEST_VERSION/phpBB-$LATEST_VERSION.tar.bz2.sha256"
+SHA=$(curl --silent --location $SHA_URL | cut -d ' ' -f 1)
+if [ "${#SHA}" != "64" ]; then
+    echo "Failed to fetch SHA256 of an archive"
+    exit 1
+fi
+
+sed -i "s/^ENV PHPBB_VERSION .*$/ENV PHPBB_VERSION $LATEST_VERSION/" Dockerfile
+sed -i "s/^ENV PHPBB_SHA256 .*$/ENV PHPBB_SHA256 $SHA/" Dockerfile
+
+echo "OK"
\ No newline at end of file