diff --git a/.dockerignore b/.dockerignore
index 0080de0..290e90f 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -1,6 +1,2 @@
-*.tzst
-/buildimage
-/dockerdeps
-/tmp
-*.docker.tzst
 *.tmp
+*.dockerimage
diff --git a/.gitignore b/.gitignore
index 29bece0..105d015 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,7 +2,5 @@ mfer/*.pb.go
 /mfer.cmd
 /tmp
 *.tmp
-*.docker.tzst
-*.tzst
-/builddeps/modcache.tar
+*.dockerimage
 /vendor
diff --git a/Dockerfile b/Dockerfile
index d8ba0b3..5c56ce3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,23 +1,29 @@
 ################################################################################
 #2345678911234567892123456789312345678941234567895123456789612345678971234567898
 ################################################################################
-FROM sneak/builder:14e59af AS builder
+FROM sneak/builder:2022-12-08 AS builder
 ENV DEBIAN_FRONTEND noninteractive
 WORKDIR /build
-COPY ./Makefile ./.golangci.yml ./go.mod ./go.sum .
-COPY ./vendor.tar /build/vendor.tar
+COPY ./Makefile ./.golangci.yml ./go.mod ./go.sum /build/
+COPY ./vendor.tzst /build/vendor.tzst
+COPY ./modcache.tzst /build/modcache.tzst
 COPY ./internal ./internal
 COPY ./bin/gitrev.sh ./bin/gitrev.sh
 COPY ./mfer ./mfer
 COPY ./cmd ./cmd
-RUN find /build
 ARG GITREV unknown
+
+RUN mkdir -p "$(go env GOMODCACHE)" && cd "$(go env GOMODCACHE)" && \
+    zstdmt -d --stdout /build/modcache.tzst | tar xf - && \
+    rm /build/modcache.tzst && cd /build
 RUN \
     cd mfer && go generate . && cd .. && \
     GOPACKAGESDEBUG=true golangci-lint run ./... && \
-    tar xf vendor.tar && rm vendor.tar && \
+    mkdir vendor && cd vendor && \
+    zstdmt -d --stdout /build/vendor.tzst | tar xf - && rm /build/vendor.tzst && \
+    cd .. && \
     make mfer.cmd
-RUN go mod vendor && tar -c . | zstdmt -19 > /src.tzst
+RUN rm -rf /build/vendor && go mod vendor && tar -c . | zstdmt -19 > /src.tzst
 ################################################################################
 #2345678911234567892123456789312345678941234567895123456789612345678971234567898
 ################################################################################
diff --git a/Makefile b/Makefile
index ad0e696..4efde9d 100644
--- a/Makefile
+++ b/Makefile
@@ -56,9 +56,9 @@ lint:
 	golangci-lint run
 	sh -c 'test -z "$$(gofmt -l .)"'
 
-docker: sneak-mfer.$(ARCH).docker.tzst
+docker: sneak-mfer.$(ARCH).tzst.dockerimage
 
-sneak-mfer.$(ARCH).docker.tzst: $(SOURCEFILES) vendor.tar
+sneak-mfer.$(ARCH).tzst.dockerimage: $(SOURCEFILES) vendor.tzst modcache.tzst
 	docker build --progress plain --build-arg GITREV=$(GITREV_BUILD) -t sneak/mfer .
 	docker save sneak/mfer | pv | zstdmt -19 > $@
 	du -sh $@
@@ -67,7 +67,16 @@ godoc:
 	open http://127.0.0.1:6060
 	godoc -http=:6060
 
-vendor.tar: go.mod go.sum
+vendor.tzst: go.mod go.sum
+	go mod tidy
 	go mod vendor
-	tar -c vendor > $@
+	cd vendor && tar -c . | pv | zstdmt -19 > $(PWD)/$@.tmp
 	rm -rf vendor
+	mv $@.tmp $@
+
+modcache.tzst: go.mod go.sum
+	go mod tidy
+	cd $(HOME)/go/pkg && chmod -R u+rw . && rm -rf mod sumdb
+	go mod download -x
+	cd $(shell go env GOMODCACHE) && tar -c . | pv | zstdmt -19 > $(PWD)/$@.tmp
+	mv $@.tmp $@
diff --git a/modcache.tzst b/modcache.tzst
new file mode 100644
index 0000000..0be2836
Binary files /dev/null and b/modcache.tzst differ
diff --git a/vendor.tar b/vendor.tar
deleted file mode 100644
index c509693..0000000
Binary files a/vendor.tar and /dev/null differ
diff --git a/vendor.tzst b/vendor.tzst
new file mode 100644
index 0000000..9f63bca
Binary files /dev/null and b/vendor.tzst differ