diff --git a/Dockerfile b/Dockerfile
index edfead3..8eaebed 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -10,7 +10,7 @@ RUN mkdir /uboot_build/ && \
 
 WORKDIR /uboot_build/
 
-ENV UBOOT_VERSION=2020.01
+ENV UBOOT_VERSION=2021.07
 
 RUN wget http://ftp.denx.de/pub/u-boot/u-boot-${UBOOT_VERSION}.tar.bz2 && \
     tar -xjf u-boot-${UBOOT_VERSION}.tar.bz2
@@ -54,7 +54,7 @@ ADD ./resources/uboot.c /uboot.c
 RUN arm-linux-gnueabi-gcc -Wall -static -static-libgcc -o /uboot_tool /uboot.c
 
 
-FROM alpine:3.11
+FROM alpine:3.14
 
 RUN apk update && \
     apk add automake build-base git autoconf confuse-dev linux-headers \