diff --git a/build/Dockerfile.alpine b/build/Dockerfile.alpine
index a744118..a6e1a7c 100644
--- a/build/Dockerfile.alpine
+++ b/build/Dockerfile.alpine
@@ -37,7 +37,7 @@ RUN printf '%s\n' 'https://dl-cdn.alpinelinux.org/alpine/v3.21/main/' \
         opendmarc \
         php php-fpm php-imap php-mbstring php-mysqli php-curl php-zip php-xml php-bz2 php-intl php-gmp php-ldap php-common php-gd php-sqlite3 \
         php-session php-pdo_mysql php-dom php-ctype php-pecl-imagick php-fileinfo \
-        phpunit php-phar php-tokenizer php-xmlwriter \
+        phpunit php-phar php-tokenizer php-xmlwriter php-iconv \
     # Nginx
     && sed '/^http {/a\ \
         types_hash_max_size 4096;\n\ \