diff --git a/Dockerfile b/Dockerfile
index 29d97c7..eaa6997 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,36 +1,37 @@
-FROM ubuntu:bionic AS build
+FROM ubuntu:focal AS build
 COPY uml.config /uml.config
-ENV LINUX_VERSION linux-4.19.57
-ENV LINUX_DOWNLOAD_URL https://cdn.kernel.org/pub/linux/kernel/v4.x/${LINUX_VERSION}.tar.xz
+
+ENV LINUX_VERSION linux-5.10.47
+ENV LINUX_DOWNLOAD_URL https://cdn.kernel.org/pub/linux/kernel/v5.x/${LINUX_VERSION}.tar.xz
+
 RUN apt-get update \
- && apt-get -y install build-essential flex bison xz-utils wget ca-certificates bc linux-headers-4.15.0-47-generic \
+ && apt-get -y install build-essential flex bison xz-utils wget ca-certificates bc \
  && wget ${LINUX_DOWNLOAD_URL} \
  && tar xJf ${LINUX_VERSION}.tar.xz \
  && rm ${LINUX_VERSION}.tar.xz \
  && cd ${LINUX_VERSION} \
  && cp /uml.config .config \
- && make ARCH=um -j10 \
+ && make ARCH=um olddefconfig \
+ && make ARCH=um -j17 \
  && mv ./linux / \
  && cd .. \
  && rm -rf ${LINUX_VERSION}
 
 FROM xena/alpine
 
-COPY --from=build /linux /linux
 ADD https://xena.greedo.xeserv.us/files/slirp /slirp
 
 # Add Tini
-ENV TINI_VERSION v0.18.0
+ENV TINI_VERSION v0.19.0
 ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini-static /chroot/tini
-RUN chmod +x /chroot/tini
 
 # Set up chroot
-RUN cd /chroot \
- && wget -O - http://dl-cdn.alpinelinux.org/alpine/v3.10/releases/x86_64/alpine-minirootfs-3.10.0-x86_64.tar.gz | tar xz \
- && chmod +x /linux \
- && chmod +x /slirp
+RUN wget -O - http://dl-cdn.alpinelinux.org/alpine/v3.12/releases/x86_64/alpine-minirootfs-3.12.7-x86_64.tar.gz | tar xz -C /chroot
+
+COPY --from=build /linux /linux
 COPY init.sh /chroot/init.sh
 COPY resolv.conf /chroot/etc/resolv.conf
+RUN chmod +x /linux /slirp /chroot/tini
 
 COPY runlinux.sh /runlinux.sh
 CMD /runlinux.sh