diff --git a/Dockerfile b/Dockerfile
index 7c5adb8..933cc1e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -23,6 +23,7 @@ ARG APCU_VERSION=5.1.21
 RUN set -eux; \
 	apk add --no-cache --virtual .build-deps \
 		$PHPIZE_DEPS \
+		icu-data-full \
 		icu-dev \
 		libzip-dev \
 		zlib-dev \