diff --git a/go.mod b/go.mod
index f3d21656..900727f0 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/kubernetes-csi/external-resizer
 
-go 1.12
+go 1.15
 
 require (
 	github.com/container-storage-interface/spec v1.2.0
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 10a0ebf9..5eaf9c89 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -5,6 +5,7 @@ github.com/blang/semver
 # github.com/cespare/xxhash/v2 v2.1.1
 github.com/cespare/xxhash/v2
 # github.com/container-storage-interface/spec v1.2.0
+## explicit
 github.com/container-storage-interface/spec/lib/go/csi
 # github.com/davecgh/go-spew v1.1.1
 github.com/davecgh/go-spew/spew
@@ -42,10 +43,12 @@ github.com/googleapis/gnostic/openapiv2
 github.com/hashicorp/golang-lru
 github.com/hashicorp/golang-lru/simplelru
 # github.com/imdario/mergo v0.3.9
+## explicit
 github.com/imdario/mergo
 # github.com/json-iterator/go v1.1.10
 github.com/json-iterator/go
 # github.com/kubernetes-csi/csi-lib-utils v0.7.0
+## explicit
 github.com/kubernetes-csi/csi-lib-utils/connection
 github.com/kubernetes-csi/csi-lib-utils/leaderelection
 github.com/kubernetes-csi/csi-lib-utils/metrics
@@ -111,6 +114,7 @@ google.golang.org/appengine/urlfetch
 # google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013
 google.golang.org/genproto/googleapis/rpc/status
 # google.golang.org/grpc v1.28.0
+## explicit
 google.golang.org/grpc
 google.golang.org/grpc/attributes
 google.golang.org/grpc/backoff
@@ -188,6 +192,7 @@ gopkg.in/inf.v0
 # gopkg.in/yaml.v2 v2.2.8
 gopkg.in/yaml.v2
 # k8s.io/api v0.19.0-rc.2
+## explicit
 k8s.io/api/admissionregistration/v1
 k8s.io/api/admissionregistration/v1beta1
 k8s.io/api/apps/v1
@@ -230,6 +235,7 @@ k8s.io/api/storage/v1
 k8s.io/api/storage/v1alpha1
 k8s.io/api/storage/v1beta1
 # k8s.io/apimachinery v0.19.0-rc.2
+## explicit
 k8s.io/apimachinery/pkg/api/errors
 k8s.io/apimachinery/pkg/api/meta
 k8s.io/apimachinery/pkg/api/resource
@@ -273,6 +279,7 @@ k8s.io/apimachinery/pkg/watch
 k8s.io/apimachinery/third_party/forked/golang/json
 k8s.io/apimachinery/third_party/forked/golang/reflect
 # k8s.io/client-go v0.19.0-rc.2
+## explicit
 k8s.io/client-go/discovery
 k8s.io/client-go/discovery/fake
 k8s.io/client-go/informers
@@ -489,9 +496,11 @@ k8s.io/cloud-provider/volume
 k8s.io/component-base/metrics
 k8s.io/component-base/version
 # k8s.io/csi-translation-lib v0.19.0-rc.2
+## explicit
 k8s.io/csi-translation-lib
 k8s.io/csi-translation-lib/plugins
 # k8s.io/klog v1.0.0
+## explicit
 k8s.io/klog
 # k8s.io/klog/v2 v2.2.0
 k8s.io/klog/v2
@@ -505,3 +514,23 @@ k8s.io/utils/trace
 sigs.k8s.io/structured-merge-diff/v3/value
 # sigs.k8s.io/yaml v1.2.0
 sigs.k8s.io/yaml
+# k8s.io/apiextensions-apiserver => k8s.io/apiextensions-apiserver v0.19.0-rc.2
+# k8s.io/apiserver => k8s.io/apiserver v0.19.0-rc.2
+# k8s.io/cli-runtime => k8s.io/cli-runtime v0.19.0-rc.2
+# k8s.io/cloud-provider => k8s.io/cloud-provider v0.19.0-rc.2
+# k8s.io/cluster-bootstrap => k8s.io/cluster-bootstrap v0.19.0-rc.2
+# k8s.io/code-generator => k8s.io/code-generator v0.19.0-rc.2
+# k8s.io/component-base => k8s.io/component-base v0.19.0-rc.2
+# k8s.io/cri-api => k8s.io/cri-api v0.19.0-rc.2
+# k8s.io/kube-aggregator => k8s.io/kube-aggregator v0.19.0-rc.2
+# k8s.io/kube-controller-manager => k8s.io/kube-controller-manager v0.19.0-rc.2
+# k8s.io/kube-proxy => k8s.io/kube-proxy v0.19.0-rc.2
+# k8s.io/kube-scheduler => k8s.io/kube-scheduler v0.19.0-rc.2
+# k8s.io/kubectl => k8s.io/kubectl v0.19.0-rc.2
+# k8s.io/kubelet => k8s.io/kubelet v0.19.0-rc.2
+# k8s.io/legacy-cloud-providers => k8s.io/legacy-cloud-providers v0.19.0-rc.2
+# k8s.io/metrics => k8s.io/metrics v0.19.0-rc.2
+# k8s.io/node-api => k8s.io/node-api v0.19.0-rc.2
+# k8s.io/sample-apiserver => k8s.io/sample-apiserver v0.19.0-rc.2
+# k8s.io/sample-cli-plugin => k8s.io/sample-cli-plugin v0.19.0-rc.2
+# k8s.io/sample-controller => k8s.io/sample-controller v0.19.0-rc.2