diff --git a/Dockerfile b/Dockerfile
index 7a74d48..43f996c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,8 +1,8 @@
-FROM alpine:latest as certs
+FROM alpine:3.14 as certs
 RUN apk add ca-certificates
 
 FROM scratch AS kubeconform
 MAINTAINER Yann HAMON <yann@mandragor.org>
 COPY --from=certs /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
 COPY bin/kubeconform /
-ENTRYPOINT ["/kubeconform"]
\ No newline at end of file
+ENTRYPOINT ["/kubeconform"]
diff --git a/Makefile b/Makefile
index 5e7aace..979d499 100644
--- a/Makefile
+++ b/Makefile
@@ -26,10 +26,10 @@ build-static:
 	CGO_ENABLED=0 GOFLAGS=-mod=vendor GOOS=linux GOARCH=amd64 GO111MODULE=on go build -trimpath -tags=netgo -ldflags "-extldflags=\"-static\""  -a -o bin/ ./...
 
 docker-test:
-	docker run -t -v $$PWD:/go/src/github.com/yannh/kubeconform -w /go/src/github.com/yannh/kubeconform golang:1.16 make test
+	docker run -t -v $$PWD:/go/src/github.com/yannh/kubeconform -w /go/src/github.com/yannh/kubeconform golang:1.17 make test
 
 docker-build-static:
-	docker run -t -v $$PWD:/go/src/github.com/yannh/kubeconform -w /go/src/github.com/yannh/kubeconform golang:1.16 make build-static
+	docker run -t -v $$PWD:/go/src/github.com/yannh/kubeconform -w /go/src/github.com/yannh/kubeconform golang:1.17 make build-static
 
 build-bats:
 	docker build -t bats -f Dockerfile.bats .
@@ -43,4 +43,4 @@ release:
 
 update-deps:
 	go get -u ./...
-	go mod tidy
\ No newline at end of file
+	go mod tidy
diff --git a/go.mod b/go.mod
index a39c3a0..84635b4 100644
--- a/go.mod
+++ b/go.mod
@@ -1,10 +1,11 @@
 module github.com/yannh/kubeconform
 
-go 1.16
+go 1.17
 
 require (
 	github.com/beevik/etree v1.1.0
 	github.com/xeipuuv/gojsonpointer v0.0.0-20190905194746-02993c407bfb // indirect
+	github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 // indirect
 	github.com/xeipuuv/gojsonschema v1.2.0
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	sigs.k8s.io/yaml v1.2.0