diff --git a/charts/tidb-cluster/values.yaml b/charts/tidb-cluster/values.yaml
index 5dcfab5f36d..5afca55961f 100644
--- a/charts/tidb-cluster/values.yaml
+++ b/charts/tidb-cluster/values.yaml
@@ -38,7 +38,7 @@ services:
     type: ClusterIP
 
 discovery:
-  image: pingcap/tidb-operator:v1.3.8
+  image: pingcap/tidb-operator:v1.4.0-alpha.1
   imagePullPolicy: IfNotPresent
   resources:
     limits:
diff --git a/charts/tidb-operator/values.yaml b/charts/tidb-operator/values.yaml
index 62cabf87233..ec509be5c75 100644
--- a/charts/tidb-operator/values.yaml
+++ b/charts/tidb-operator/values.yaml
@@ -12,12 +12,12 @@ rbac:
 timezone: UTC
 
 # operatorImage is TiDB Operator image
-operatorImage: pingcap/tidb-operator:v1.3.8
+operatorImage: pingcap/tidb-operator:v1.4.0-alpha.1
 imagePullPolicy: IfNotPresent
 # imagePullSecrets: []
 
 # tidbBackupManagerImage is tidb backup manager image
-tidbBackupManagerImage: pingcap/tidb-backup-manager:v1.3.8
+tidbBackupManagerImage: pingcap/tidb-backup-manager:v1.4.0-alpha.1
 
 #
 # Enable or disable tidb-operator features:
diff --git a/deploy/aliyun/variables.tf b/deploy/aliyun/variables.tf
index d0699223d29..e8bd22301ec 100644
--- a/deploy/aliyun/variables.tf
+++ b/deploy/aliyun/variables.tf
@@ -10,7 +10,7 @@ variable "bastion_cpu_core_count" {
 
 variable "operator_version" {
   type    = string
-  default = "v1.3.8"
+  default = "v1.4.0-alpha.1"
 }
 
 variable "operator_helm_values" {
diff --git a/deploy/aws/variables.tf b/deploy/aws/variables.tf
index c7a63d8b665..e02d975ce9c 100644
--- a/deploy/aws/variables.tf
+++ b/deploy/aws/variables.tf
@@ -19,7 +19,7 @@ variable "eks_version" {
 
 variable "operator_version" {
   description = "TiDB operator version"
-  default     = "v1.3.8"
+  default     = "v1.4.0-alpha.1"
 }
 
 variable "operator_values" {
diff --git a/deploy/gcp/variables.tf b/deploy/gcp/variables.tf
index 1f86247d05a..2c07fce8e1f 100644
--- a/deploy/gcp/variables.tf
+++ b/deploy/gcp/variables.tf
@@ -28,7 +28,7 @@ variable "tidb_version" {
 }
 
 variable "tidb_operator_version" {
-  default = "v1.3.8"
+  default = "v1.4.0-alpha.1"
 }
 
 variable "tidb_operator_chart_version" {
diff --git a/go.mod b/go.mod
index ead2cec3867..600462e23a8 100644
--- a/go.mod
+++ b/go.mod
@@ -54,8 +54,8 @@ require (
 	github.com/pingcap/errors v0.11.0
 	github.com/pingcap/kvproto v0.0.0-20200927054727-1290113160f0
 	github.com/pingcap/tidb v2.1.0-beta+incompatible
-	github.com/pingcap/tidb-operator/pkg/apis v1.3.8
-	github.com/pingcap/tidb-operator/pkg/client v1.3.8
+	github.com/pingcap/tidb-operator/pkg/apis v1.4.0-alpha.1
+	github.com/pingcap/tidb-operator/pkg/client v1.4.0-alpha.1
 	github.com/prometheus/client_golang v1.7.1
 	github.com/prometheus/client_model v0.2.0
 	github.com/prometheus/common v0.26.0
diff --git a/hack/bump-version.sh b/hack/bump-version.sh
index 8c8f196f4f5..d3484ae0bd1 100755
--- a/hack/bump-version.sh
+++ b/hack/bump-version.sh
@@ -22,8 +22,8 @@ if [[ "$OSTYPE" == "darwin"* ]]; then
 fi
 
 # parameters
-OPERATOR_OLD="v1\.3\.7"
-OPERATOR_NEW="v1\.3\.8"
+OPERATOR_OLD="v1\.3\.8"
+OPERATOR_NEW="v1\.4\.0-alpha\.1"
 TIDB_OLD="v5\.4\.1"
 TIDB_NEW="v6\.1\.0"
 DM_OLD="v5.4.1"
diff --git a/pkg/client/go.mod b/pkg/client/go.mod
index 36cfaed4cb1..a8b1c927f26 100644
--- a/pkg/client/go.mod
+++ b/pkg/client/go.mod
@@ -3,7 +3,7 @@ module github.com/pingcap/tidb-operator/pkg/client
 go 1.16
 
 require (
-	github.com/pingcap/tidb-operator/pkg/apis v1.3.8
+	github.com/pingcap/tidb-operator/pkg/apis v1.4.0-alpha.1
 	k8s.io/apimachinery v0.19.16
 	k8s.io/client-go v0.19.16
 )