diff --git a/Dockerfile b/Dockerfile
index e516978..d22123a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -65,7 +65,8 @@ RUN apk add --no-cache \
     php8-curl \
     php8-simplexml \
     php8-xml \
-    php8-dom
+    php8-dom \
+    php8-intl
 
 COPY --from=builder --chown=nginx:nginx /var/lib/roundcube /var/lib/roundcube