diff --git a/app/Dockerfile b/app/Dockerfile
index 411c289..efdc4aa 100644
--- a/app/Dockerfile
+++ b/app/Dockerfile
@@ -1,21 +1,21 @@
-FROM alpine:3.13
+FROM alpine:3.12
 EXPOSE 9000/tcp
 
 ENV SCRIPT_ROOT=/opt/tt-rss
 
-RUN apk add --no-cache dcron php8 php8-fpm \
-	php8-pdo php8-gd php8-pgsql php8-pdo_pgsql \
-	php8-mbstring php8-intl php8-xml php8-curl \
-	php8-session php8-tokenizer php8-dom php8-fileinfo \
-	php8-json php8-iconv php8-pcntl php8-posix php8-zip php8-exif \
-	php8-openssl git postgresql-client sudo php8-pecl-xdebug rsync && \
-	sed -i 's/\(memory_limit =\) 128M/\1 256M/' /etc/php8/php.ini && \
+RUN apk add --no-cache dcron php7 php7-fpm \
+	php7-pdo php7-gd php7-pgsql php7-pdo_pgsql \
+	php7-mbstring php7-intl php7-xml php7-curl \
+	php7-session php7-tokenizer php7-dom php7-fileinfo \
+	php7-json php7-iconv php7-pcntl php7-posix php7-zip php7-exif \
+	php7-openssl git postgresql-client sudo php7-pecl-xdebug rsync && \
+	sed -i 's/\(memory_limit =\) 128M/\1 256M/' /etc/php7/php.ini && \
 	sed -i -e 's/^listen = 127.0.0.1:9000/listen = 9000/' \
 		-e 's/;\(clear_env\) = .*/\1 = no/i' \
 		-e 's/^\(user\|group\) = .*/\1 = app/i' \
 		-e 's/;\(php_admin_value\[error_log\]\) = .*/\1 = \/tmp\/error.log/' \
 		-e 's/;\(php_admin_flag\[log_errors\]\) = .*/\1 = on/' \
-			/etc/php8/php-fpm.d/www.conf && \
+			/etc/php7/php-fpm.d/www.conf && \
 	mkdir -p /var/www ${SCRIPT_ROOT}/config.d
 
 ADD startup.sh ${SCRIPT_ROOT}
@@ -38,7 +38,7 @@ ENV TTRSS_DB_HOST="db"
 ENV TTRSS_DB_PORT="5432"
 
 ENV TTRSS_MYSQL_CHARSET="UTF8"
-ENV TTRSS_PHP_EXECUTABLE="/usr/bin/php8"
+ENV TTRSS_PHP_EXECUTABLE="/usr/bin/php7"
 ENV TTRSS_PLUGINS="auth_internal, note, nginx_xaccel"
 
 CMD ${SCRIPT_ROOT}/startup.sh
diff --git a/app/startup.sh b/app/startup.sh
index cef538a..b120aee 100755
--- a/app/startup.sh
+++ b/app/startup.sh
@@ -58,7 +58,7 @@ cp ${SCRIPT_ROOT}/config.docker.php $DST_DIR/config.php
 chmod 644 $DST_DIR/config.php
 
 chown -R $OWNER_UID:$OWNER_GID $DST_DIR \
-	/var/log/php8
+	/var/log/php7
 
 for d in cache lock feed-icons; do
 	chmod 777 $DST_DIR/$d
@@ -83,7 +83,7 @@ if [ ! -z "${TTRSS_XDEBUG_ENABLED}" ]; then
 	fi
 	echo enabling xdebug with the following parameters:
 	env | grep TTRSS_XDEBUG
-	cat > /etc/php8/conf.d/50_xdebug.ini <<EOF
+	cat > /etc/php7/conf.d/50_xdebug.ini <<EOF
 zend_extension=xdebug.so
 xdebug.mode=develop,trace,debug
 xdebug.start_with_request = yes
@@ -92,7 +92,7 @@ xdebug.client_host = ${TTRSS_XDEBUG_HOST}
 EOF
 fi
 
-cd $DST_DIR && sudo -E -u app php8 ./update.php --update-schema=force-yes
+cd $DST_DIR && sudo -E -u app php7 ./update.php --update-schema=force-yes
 
 rm -f /tmp/error.log && mkfifo /tmp/error.log && chown app:app /tmp/error.log
 
@@ -100,4 +100,4 @@ rm -f /tmp/error.log && mkfifo /tmp/error.log && chown app:app /tmp/error.log
 
 touch $DST_DIR/.app_is_ready
 
-exec /usr/sbin/php-fpm8 --nodaemonize --force-stderr
+exec /usr/sbin/php-fpm7 --nodaemonize --force-stderr
diff --git a/app/updater.sh b/app/updater.sh
index e3a5bb5..ea312c5 100755
--- a/app/updater.sh
+++ b/app/updater.sh
@@ -24,4 +24,4 @@ while [ ! -s $DST_DIR/config.php -a -e $DST_DIR/.app_is_ready ]; do
 	sleep 3
 done
 
-sudo -E -u app /usr/bin/php8 /var/www/html/tt-rss/update_daemon2.php
+sudo -E -u app /usr/bin/php7 /var/www/html/tt-rss/update_daemon2.php