diff --git a/src/app/Dockerfile b/src/app/Dockerfile
index dac6d81..22f78c5 100644
--- a/src/app/Dockerfile
+++ b/src/app/Dockerfile
@@ -6,7 +6,7 @@ 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-session php8-tokenizer php8-dom php8-fileinfo php8-ctype \
 	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 && \