diff --git a/Dockerfile b/Dockerfile
index a333c62..b90ac9f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -49,6 +49,7 @@ RUN apk add --no-progress --no-cache \
     php7-zip \
     php7-intl \
     php7-exif \
+    php7-iconv \
   && cd /tmp \
   && curl -s http://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer \
   && chmod +x /usr/local/bin/composer \