diff --git a/Dockerfile b/Dockerfile
index 24a93a2..0875849 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,8 +1,8 @@
-FROM php:7.4-cli
-
-ENV TZ=Europe/Berlin
-
+FROM php:8.3-cli
 RUN apt-get update && \
-    apt-get install -y zip unzip locales &&\
+    apt-get install -y zip unzip locales libicu-dev libonig-dev &&\
+    docker-php-ext-configure intl &&\
+    docker-php-ext-install intl &&\
     sed -i -e 's/# de_DE.UTF-8 UTF-8/de_DE.UTF-8 UTF-8/' /etc/locale.gen &&\
     locale-gen
+RUN docker-php-ext-enable intl