diff --git a/README.md b/README.md
index 8fad396..bda70d8 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@ Set the JSON of secrets to `secrets`.
 
 ```yaml
 steps:
-  - uses: koyashiro/export-secrets-action@v0.3.0
+  - uses: koyashiro/export-secrets-action@v0.4.0
     with:
       secrets: ${{ toJSON(secrets) }}
 ```
@@ -20,7 +20,7 @@ For example, a secret like `TF_VAR_EXAMPLE` will be exported as `TF_VAR_example`
 
 ```yaml
 steps:
-  - uses: koyashiro/export-secrets-action@v0.3.0
+  - uses: koyashiro/export-secrets-action@v0.4.0
     with:
       secrets: ${{ toJSON(secrets) }}
       downcase-tf-var: true
@@ -33,7 +33,7 @@ For example, a secret like `TF_TOKEN_EXAMPLE_COM` will be exported as `TF_TOKEN_
 
 ```yaml
 steps:
-  - uses: koyashiro/export-secrets-action@v0.3.0
+  - uses: koyashiro/export-secrets-action@v0.4.0
     with:
       secrets: ${{ toJSON(secrets) }}
       downcase-tf-token: true
diff --git a/package-lock.json b/package-lock.json
index 52c7947..115ec1e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "export-secrets-action",
-  "version": "0.3.0",
+  "version": "0.4.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "export-secrets-action",
-      "version": "0.3.0",
+      "version": "0.4.0",
       "license": "MIT",
       "dependencies": {
         "@actions/core": "1.10.1",
diff --git a/package.json b/package.json
index e88707c..a1f2e81 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "export-secrets-action",
-  "version": "0.3.0",
+  "version": "0.4.0",
   "description": "Export GitHub Actions secrets as environment variables",
   "keywords": [
     "actions"