diff --git a/Dockerfile.alpine-rust b/Dockerfile.alpine
similarity index 90%
rename from Dockerfile.alpine-rust
rename to Dockerfile.alpine
index 9965053a1..ca95e42c4 100644
--- a/Dockerfile.alpine-rust
+++ b/Dockerfile.alpine
@@ -1,12 +1,13 @@
-# this comes from standard alpine nightly file
-#  https://github.com/rust-lang/docker-rust-nightly/blob/master/alpine3.12/Dockerfile
-# with some changes to support our toolchain, etc
-FROM alpine:3.12
+# we build with go and rust
+FROM golang:1.14-alpine3.12
 
 ENV RUSTUP_HOME=/usr/local/rustup \
     CARGO_HOME=/usr/local/cargo \
     PATH=/usr/local/cargo/bin:$PATH
 
+# this comes from standard alpine nightly file
+#  https://github.com/rust-lang/docker-rust-nightly/blob/master/alpine3.12/Dockerfile
+# with some changes to support our toolchain, etc
 RUN set -eux; \
     apk add --no-cache \
     ca-certificates \
@@ -21,6 +22,11 @@ RUN chmod -R a+w $RUSTUP_HOME $CARGO_HOME
 # /usr/lib/gcc/x86_64-alpine-linux-musl/9.3.0/../../../../x86_64-alpine-linux-musl/bin/ld: cannot find crti.o: No such file or directory
 ENV LIBRARY_PATH=/usr/local/rustup/toolchains/nightly-2020-06-08-x86_64-unknown-linux-musl/lib/rustlib/x86_64-unknown-linux-musl/lib:$LIBRARY_PATH
 
+# prepare go cache dirs
+RUN mkdir -p /.cache/go-build
+RUN chmod -R 777 /.cache
+
+
 # PRE-FETCH MANY DEPS
 WORKDIR /scratch
 COPY Cargo.toml /scratch/
diff --git a/Dockerfile.alpine-go b/Dockerfile.alpine-go
deleted file mode 100644
index 7008c109e..000000000
--- a/Dockerfile.alpine-go
+++ /dev/null
@@ -1,7 +0,0 @@
-FROM golang:1.14-alpine3.12
-
-RUN set -eux; \
-    apk add --no-cache build-base;
-
-RUN mkdir -p /.cache/go-build
-RUN chmod -R 777 /.cache
diff --git a/Makefile b/Makefile
index 0837307c4..3f9b3b7e1 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 .PHONY: all build build-rust build-go test docker-image docker-image-centos7 docker-image-cross
 
-DOCKER_TAG := 0.8.1
+DOCKER_TAG := 0.8.2
 USER_ID := $(shell id -u)
 USER_GROUP = $(shell id -g)
 
@@ -59,8 +59,7 @@ docker-image-cross:
 	docker build . -t cosmwasm/go-ext-builder:$(DOCKER_TAG)-cross -f ./Dockerfile.cross
 
 docker-image-alpine:
-	docker build . -t cosmwasm/go-ext-builder:$(DOCKER_TAG)-alpine -f ./Dockerfile.alpine-rust
-	docker build . -t cosmwasm/go-ext-tester:$(DOCKER_TAG)-alpine -f ./Dockerfile.alpine-go
+	docker build . -t cosmwasm/go-ext-builder:$(DOCKER_TAG)-alpine -f ./Dockerfile.alpine
 
 docker-images: docker-image-centos7 docker-image-cross docker-image-alpine
 
@@ -68,7 +67,6 @@ docker-publish: docker-images
 	docker push cosmwasm/go-ext-builder:$(DOCKER_TAG)-cross
 	docker push cosmwasm/go-ext-builder:$(DOCKER_TAG)-centos7
 	docker push cosmwasm/go-ext-builder:$(DOCKER_TAG)-alpine
-	docker push cosmwasm/go-ext-tester:$(DOCKER_TAG)-alpine
 
 # and use them to compile release builds
 release:
@@ -82,11 +80,9 @@ test-alpine:
 	rm -rf target/release/examples
 	docker run --rm -u $(USER_ID):$(USER_GROUP) -v $(shell pwd):/code cosmwasm/go-ext-builder:$(DOCKER_TAG)-alpine
 	# try running go tests using this lib with muslc
-	docker run --rm -u $(USER_ID):$(USER_GROUP) -v $(shell pwd):/code -w /code cosmwasm/go-ext-tester:$(DOCKER_TAG)-alpine go build -tags muslc .
-	docker run --rm -u $(USER_ID):$(USER_GROUP) -v $(shell pwd):/code -w /code cosmwasm/go-ext-tester:$(DOCKER_TAG)-alpine go test -tags muslc ./api ./types
+	docker run --rm -u $(USER_ID):$(USER_GROUP) -v $(shell pwd):/code -w /code cosmwasm/go-ext-builder:$(DOCKER_TAG)-alpine go build -tags muslc .
+	docker run --rm -u $(USER_ID):$(USER_GROUP) -v $(shell pwd):/code -w /code cosmwasm/go-ext-builder:$(DOCKER_TAG)-alpine go test -tags muslc ./api ./types
 	# build a go binary
-	docker run --rm -u $(USER_ID):$(USER_GROUP) -v $(shell pwd):/code -w /code cosmwasm/go-ext-tester:$(DOCKER_TAG)-alpine go build -tags muslc -o muslc.exe ./cmd
-	# run this binary in a simple alpine image
-	docker run --rm -it -v $(shell pwd):/code -w /code alpine:3.12 ./muslc.exe ./api/testdata/hackatom.wasm
+	docker run --rm -u $(USER_ID):$(USER_GROUP) -v $(shell pwd):/code -w /code cosmwasm/go-ext-builder:$(DOCKER_TAG)-alpine go build -tags muslc -o muslc.exe ./cmd
 	# run static binary locally (not dlls)
 	./muslc.exe ./api/testdata/hackatom.wasm
diff --git a/lib.go b/lib.go
index 134abaca0..19e7a6554 100644
--- a/lib.go
+++ b/lib.go
@@ -181,12 +181,12 @@ func (w *Wasmer) Query(
 // the given data.
 //
 // MigrateMsg has some data on how to perform the migration.
-func (w *Wasmer) Migrate(code CodeID, env types.Env, migrateMsg []byte, store *KVStore, goapi GoAPI, querier *Querier, gasMeter *api.GasMeter, gasLimit uint64) (*types.Result, uint64, error) {
+func (w *Wasmer) Migrate(code CodeID, env types.Env, migrateMsg []byte, store KVStore, goapi GoAPI, querier Querier, gasMeter api.GasMeter, gasLimit uint64) (*types.Result, uint64, error) {
 	paramBin, err := json.Marshal(env)
 	if err != nil {
 		return nil, 0, err
 	}
-	data, gasUsed, err := api.Migrate(w.cache, code, paramBin, migrateMsg, gasMeter, store, &goapi, querier, gasLimit)
+	data, gasUsed, err := api.Migrate(w.cache, code, paramBin, migrateMsg, &gasMeter, &store, &goapi, &querier, gasLimit)
 	if err != nil {
 		return nil, gasUsed, err
 	}