diff --git a/Dockerfile b/Dockerfile
index d22123a..3d17b88 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.14 AS builder
+FROM alpine:3.15 AS builder
 
 RUN apk add --no-cache \
     php8 \
@@ -22,8 +22,8 @@ RUN echo "$COMPOSER_SHA256_SUM  composer.phar" | sha256sum -c - || exit 1
 RUN mv composer.phar /usr/bin/composer
 RUN chmod +x /usr/bin/composer
 
-ENV VERSION=1.5-rc
-ENV SHA256_SUM=5287fbe5cf41ff2ae71648b863b0e4726d7f932c84f3b4fb30de096dc208f40c
+ENV VERSION=1.5.1
+ENV SHA256_SUM=611b0d80227d0b70289c715787b2d85fd15ed915eb56d585c104c24376036e83
 RUN wget https://github.com/roundcube/roundcubemail/releases/download/$VERSION/roundcubemail-$VERSION-complete.tar.gz
 RUN echo "$SHA256_SUM  roundcubemail-$VERSION-complete.tar.gz" | sha256sum -c - || exit 1
 RUN mkdir -p /var/lib/roundcube