diff --git a/misc/docker/Dockerfile b/misc/docker/Dockerfile
index 098633fc..20171d25 100644
--- a/misc/docker/Dockerfile
+++ b/misc/docker/Dockerfile
@@ -5,7 +5,9 @@ RUN wget -O- http://nixos.org/releases/nix/nix-1.11.2/nix-1.11.2-x86_64-linux.ta
     && for i in $(seq 1 30); do echo "nixbld$i:x:$((30000 + $i)):30000:::" >> /etc/passwd; done \
     && mkdir -m 0755 /nix && USER=root sh nix-*-x86_64-linux/install \
     && echo ". /root/.nix-profile/etc/profile.d/nix.sh" >> /etc/profile \
-    && rm -r /nix-*-x86_64-linux
+    && rm -r /nix-*-x86_64-linux \
+    && apk --update add bash tar \
+    && rm -rf /var/cache/apk/*
 
 ONBUILD ENV \
     ENV=/etc/profile \