diff --git a/dockerfile b/dockerfile
index 5a8e509..8f82837 100644
--- a/dockerfile
+++ b/dockerfile
@@ -5,6 +5,7 @@ ENV COMPOSER_ALLOW_SUPERUSER=1
 RUN set -ex; \
     apt-get update; \
     apt-get -y upgrade; \
+    apt-get install -y aspell-fr; \
     composer \
     --working-dir=/usr/src/roundcubemail/ \
     --prefer-dist \