diff --git a/README.md b/README.md
index 668c32f0..1b15c5fc 100644
--- a/README.md
+++ b/README.md
@@ -41,8 +41,8 @@ Subsequent actions will have access to the following outputs:
   - The `directory` configuration that was used by dependabot for this updated Dependency.
 - `steps.dependabot-metadata.outputs.package-ecosystem`
   - The `package-ecosystem` configuration that was used by dependabot for this updated Dependency.
-- `steps.dependabot-metadata.outputs.target_branch`
-  - The `target_branch` configuration that was used by dependabot for this updated Dependency.
+- `steps.dependabot-metadata.outputs.target-branch`
+  - The `target-branch` configuration that was used by dependabot for this updated Dependency.
 
 **Note:** These outputs will only be populated if the target Pull Request was opened by Dependabot and contains
 **only** Dependabot-created commits.
diff --git a/action.yml b/action.yml
index 574a887a..fe5bdd61 100644
--- a/action.yml
+++ b/action.yml
@@ -20,8 +20,8 @@ outputs:
     description: 'The `directory` configuration that was used by dependabot for this updated Dependency.'
   package-ecosystem:
     description: 'The `package-ecosystem` configuration that was used by dependabot for this updated Dependency.'
-  target_branch:
-    description: 'The `target_branch` configuration that was used by dependabot for this updated Dependency.'
+  target-branch:
+    description: 'The `target-branch` configuration that was used by dependabot for this updated Dependency.'
 runs:
   using: 'node12'
   main: 'dist/index.js'
diff --git a/dist/index.js b/dist/index.js
index fbdabbd5..70c6fc6d 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -13462,7 +13462,7 @@ function set(updatedDependencies) {
     core.info(`outputs.update-type: ${updateType}`);
     core.info(`outputs.directory: ${directory}`);
     core.info(`outputs.package-ecosystem: ${ecosystem}`);
-    core.info(`outputs.target_branch: ${target}`);
+    core.info(`outputs.target-branch: ${target}`);
     core.endGroup();
     core.setOutput('updated-dependencies-json', updatedDependencies);
     core.setOutput('dependency-names', dependencyNames);
@@ -13470,7 +13470,7 @@ function set(updatedDependencies) {
     core.setOutput('update-type', updateType);
     core.setOutput('directory', directory);
     core.setOutput('package-ecosystem', ecosystem);
-    core.setOutput('target_branch', target);
+    core.setOutput('target-branch', target);
 }
 function maxDependencyTypes(updatedDependencies) {
     const dependencyTypes = updatedDependencies.reduce(function (dependencyTypes, dependency) {
diff --git a/src/dependabot/output.test.ts b/src/dependabot/output.test.ts
index 5c8cd330..83e5ba2b 100644
--- a/src/dependabot/output.test.ts
+++ b/src/dependabot/output.test.ts
@@ -34,7 +34,7 @@ test('when given a single dependency it sets its values', async () => {
   expect(core.setOutput).toBeCalledWith('update-type', 'version-update:semver-minor')
   expect(core.setOutput).toBeCalledWith('directory', 'wwwroot')
   expect(core.setOutput).toBeCalledWith('package-ecosystem', 'nuget')
-  expect(core.setOutput).toBeCalledWith('target_branch', 'main')
+  expect(core.setOutput).toBeCalledWith('target-branch', 'main')
 })
 
 test('when given a multiple dependencies, it uses the highest values for types', async () => {
@@ -82,7 +82,7 @@ test('when given a multiple dependencies, it uses the highest values for types',
   expect(core.setOutput).toBeCalledWith('update-type', 'version-update:semver-major')
   expect(core.setOutput).toBeCalledWith('directory', '')
   expect(core.setOutput).toBeCalledWith('package-ecosystem', '')
-  expect(core.setOutput).toBeCalledWith('target_branch', '')
+  expect(core.setOutput).toBeCalledWith('target-branch', '')
 })
 
 test('when the dependency has no update type', async () => {
@@ -110,7 +110,7 @@ test('when the dependency has no update type', async () => {
   expect(core.setOutput).toBeCalledWith('update-type', null)
   expect(core.setOutput).toBeCalledWith('directory', '')
   expect(core.setOutput).toBeCalledWith('package-ecosystem', '')
-  expect(core.setOutput).toBeCalledWith('target_branch', '')
+  expect(core.setOutput).toBeCalledWith('target-branch', '')
 })
 
 test('when given a multiple dependencies, and some do not have update types', async () => {
@@ -158,5 +158,5 @@ test('when given a multiple dependencies, and some do not have update types', as
   expect(core.setOutput).toBeCalledWith('update-type', 'version-update:semver-minor')
   expect(core.setOutput).toBeCalledWith('directory', '')
   expect(core.setOutput).toBeCalledWith('package-ecosystem', '')
-  expect(core.setOutput).toBeCalledWith('target_branch', '')
+  expect(core.setOutput).toBeCalledWith('target-branch', '')
 })
diff --git a/src/dependabot/output.ts b/src/dependabot/output.ts
index 3a5671cd..6f851d09 100644
--- a/src/dependabot/output.ts
+++ b/src/dependabot/output.ts
@@ -31,7 +31,7 @@ export function set (updatedDependencies: Array<updatedDependency>): void {
   core.info(`outputs.update-type: ${updateType}`)
   core.info(`outputs.directory: ${directory}`)
   core.info(`outputs.package-ecosystem: ${ecosystem}`)
-  core.info(`outputs.target_branch: ${target}`)
+  core.info(`outputs.target-branch: ${target}`)
   core.endGroup()
 
   core.setOutput('updated-dependencies-json', updatedDependencies)
@@ -40,7 +40,7 @@ export function set (updatedDependencies: Array<updatedDependency>): void {
   core.setOutput('update-type', updateType)
   core.setOutput('directory', directory)
   core.setOutput('package-ecosystem', ecosystem)
-  core.setOutput('target_branch', target)
+  core.setOutput('target-branch', target)
 }
 
 function maxDependencyTypes (updatedDependencies: Array<updatedDependency>): string {
diff --git a/src/main.test.ts b/src/main.test.ts
index d6f40e94..eb9c4c49 100644
--- a/src/main.test.ts
+++ b/src/main.test.ts
@@ -102,7 +102,7 @@ test('it sets the updated dependency as an output for subsequent actions', async
   expect(core.setOutput).toBeCalledWith('update-type', 'version-update:semver-minor')
   expect(core.setOutput).toBeCalledWith('directory', '/')
   expect(core.setOutput).toBeCalledWith('package-ecosystem', 'nuget')
-  expect(core.setOutput).toBeCalledWith('target_branch', 'main')
+  expect(core.setOutput).toBeCalledWith('target-branch', 'main')
 })
 
 test('if there are multiple dependencies, it summarizes them', async () => {
@@ -164,7 +164,7 @@ test('if there are multiple dependencies, it summarizes them', async () => {
   expect(core.setOutput).toBeCalledWith('update-type', 'version-update:semver-major')
   expect(core.setOutput).toBeCalledWith('directory', 'api/main')
   expect(core.setOutput).toBeCalledWith('package-ecosystem', 'npm_and_yarn')
-  expect(core.setOutput).toBeCalledWith('target_branch', 'trunk')
+  expect(core.setOutput).toBeCalledWith('target-branch', 'trunk')
 })
 
 test('it sets the action to failed if there is an unexpected exception', async () => {