diff --git a/packages/core/RELEASES.md b/packages/core/RELEASES.md
index 352efe84..4926ebdc 100644
--- a/packages/core/RELEASES.md
+++ b/packages/core/RELEASES.md
@@ -1,5 +1,8 @@
 # @actions/core Releases
 
+### 1.2.7
+- [Prepend newline for set-output](https://github.com/actions/toolkit/pull/772)
+
 ### 1.2.6
 - [Update `exportVariable` and `addPath` to use environment files](https://github.com/actions/toolkit/pull/571)
 
diff --git a/packages/core/__tests__/core.test.ts b/packages/core/__tests__/core.test.ts
index 0e52e9b2..a069e89c 100644
--- a/packages/core/__tests__/core.test.ts
+++ b/packages/core/__tests__/core.test.ts
@@ -159,17 +159,20 @@ describe('@actions/core', () => {
 
   it('setOutput produces the correct command', () => {
     core.setOutput('some output', 'some value')
-    assertWriteCalls([`::set-output name=some output::some value${os.EOL}`])
+    assertWriteCalls([
+      os.EOL,
+      `::set-output name=some output::some value${os.EOL}`
+    ])
   })
 
   it('setOutput handles bools', () => {
     core.setOutput('some output', false)
-    assertWriteCalls([`::set-output name=some output::false${os.EOL}`])
+    assertWriteCalls([os.EOL, `::set-output name=some output::false${os.EOL}`])
   })
 
   it('setOutput handles numbers', () => {
     core.setOutput('some output', 1.01)
-    assertWriteCalls([`::set-output name=some output::1.01${os.EOL}`])
+    assertWriteCalls([os.EOL, `::set-output name=some output::1.01${os.EOL}`])
   })
 
   it('setFailed sets the correct exit code and failure message', () => {
diff --git a/packages/core/package-lock.json b/packages/core/package-lock.json
index a1ede3d2..e2625929 100644
--- a/packages/core/package-lock.json
+++ b/packages/core/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "@actions/core",
-  "version": "1.2.6",
+  "version": "1.2.7",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/packages/core/package.json b/packages/core/package.json
index ffcced43..a0e72b31 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@actions/core",
-  "version": "1.2.6",
+  "version": "1.2.7",
   "description": "Actions core lib",
   "keywords": [
     "github",
diff --git a/packages/core/src/core.ts b/packages/core/src/core.ts
index e7e366c5..13f4dfa3 100644
--- a/packages/core/src/core.ts
+++ b/packages/core/src/core.ts
@@ -99,6 +99,7 @@ export function getInput(name: string, options?: InputOptions): string {
  */
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
 export function setOutput(name: string, value: any): void {
+  process.stdout.write(os.EOL)
   issueCommand('set-output', {name}, value)
 }