diff --git a/dist/index.js b/dist/index.js
index d3d1002..191f274 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -650,6 +650,32 @@ class ExecState extends events.EventEmitter {
 
 /***/ }),
 
+/***/ 82:
+/***/ (function(__unusedmodule, exports) {
+
+"use strict";
+
+// We use any as a valid input type
+/* eslint-disable @typescript-eslint/no-explicit-any */
+Object.defineProperty(exports, "__esModule", { value: true });
+/**
+ * Sanitizes an input into a string so it can be passed into issueCommand safely
+ * @param input input to sanitize into a string
+ */
+function toCommandValue(input) {
+    if (input === null || input === undefined) {
+        return '';
+    }
+    else if (typeof input === 'string' || input instanceof String) {
+        return input;
+    }
+    return JSON.stringify(input);
+}
+exports.toCommandValue = toCommandValue;
+//# sourceMappingURL=utils.js.map
+
+/***/ }),
+
 /***/ 87:
 /***/ (function(module) {
 
@@ -657,6 +683,42 @@ module.exports = require("os");
 
 /***/ }),
 
+/***/ 102:
+/***/ (function(__unusedmodule, exports, __webpack_require__) {
+
+"use strict";
+
+// For internal use, subject to change.
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];
+    result["default"] = mod;
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+// We use any as a valid input type
+/* eslint-disable @typescript-eslint/no-explicit-any */
+const fs = __importStar(__webpack_require__(747));
+const os = __importStar(__webpack_require__(87));
+const utils_1 = __webpack_require__(82);
+function issueCommand(command, message) {
+    const filePath = process.env[`GITHUB_${command}`];
+    if (!filePath) {
+        throw new Error(`Unable to find environment variable for file command ${command}`);
+    }
+    if (!fs.existsSync(filePath)) {
+        throw new Error(`Missing file at path: ${filePath}`);
+    }
+    fs.appendFileSync(filePath, `${utils_1.toCommandValue(message)}${os.EOL}`, {
+        encoding: 'utf8'
+    });
+}
+exports.issueCommand = issueCommand;
+//# sourceMappingURL=file-command.js.map
+
+/***/ }),
+
 /***/ 129:
 /***/ (function(module) {
 
@@ -2794,6 +2856,7 @@ var __importStar = (this && this.__importStar) || function (mod) {
 };
 Object.defineProperty(exports, "__esModule", { value: true });
 const os = __importStar(__webpack_require__(87));
+const utils_1 = __webpack_require__(82);
 /**
  * Commands
  *
@@ -2847,28 +2910,14 @@ class Command {
         return cmdStr;
     }
 }
-/**
- * Sanitizes an input into a string so it can be passed into issueCommand safely
- * @param input input to sanitize into a string
- */
-function toCommandValue(input) {
-    if (input === null || input === undefined) {
-        return '';
-    }
-    else if (typeof input === 'string' || input instanceof String) {
-        return input;
-    }
-    return JSON.stringify(input);
-}
-exports.toCommandValue = toCommandValue;
 function escapeData(s) {
-    return toCommandValue(s)
+    return utils_1.toCommandValue(s)
         .replace(/%/g, '%25')
         .replace(/\r/g, '%0D')
         .replace(/\n/g, '%0A');
 }
 function escapeProperty(s) {
-    return toCommandValue(s)
+    return utils_1.toCommandValue(s)
         .replace(/%/g, '%25')
         .replace(/\r/g, '%0D')
         .replace(/\n/g, '%0A')
@@ -2943,6 +2992,8 @@ var __importStar = (this && this.__importStar) || function (mod) {
 };
 Object.defineProperty(exports, "__esModule", { value: true });
 const command_1 = __webpack_require__(431);
+const file_command_1 = __webpack_require__(102);
+const utils_1 = __webpack_require__(82);
 const os = __importStar(__webpack_require__(87));
 const path = __importStar(__webpack_require__(622));
 /**
@@ -2969,9 +3020,17 @@ var ExitCode;
  */
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
 function exportVariable(name, val) {
-    const convertedVal = command_1.toCommandValue(val);
+    const convertedVal = utils_1.toCommandValue(val);
     process.env[name] = convertedVal;
-    command_1.issueCommand('set-env', { name }, convertedVal);
+    const filePath = process.env['GITHUB_ENV'] || '';
+    if (filePath) {
+        const delimiter = '_GitHubActionsFileCommandDelimeter_';
+        const commandValue = `${name}<<${delimiter}${os.EOL}${convertedVal}${os.EOL}${delimiter}`;
+        file_command_1.issueCommand('ENV', commandValue);
+    }
+    else {
+        command_1.issueCommand('set-env', { name }, convertedVal);
+    }
 }
 exports.exportVariable = exportVariable;
 /**
@@ -2987,7 +3046,13 @@ exports.setSecret = setSecret;
  * @param inputPath
  */
 function addPath(inputPath) {
-    command_1.issueCommand('add-path', {}, inputPath);
+    const filePath = process.env['GITHUB_PATH'] || '';
+    if (filePath) {
+        file_command_1.issueCommand('PATH', inputPath);
+    }
+    else {
+        command_1.issueCommand('add-path', {}, inputPath);
+    }
     process.env['PATH'] = `${inputPath}${path.delimiter}${process.env['PATH']}`;
 }
 exports.addPath = addPath;
diff --git a/dist/install-elixir b/dist/install-elixir
index d31c8ce..3d471cc 100755
--- a/dist/install-elixir
+++ b/dist/install-elixir
@@ -7,4 +7,4 @@ cd $RUNNER_TEMP
 wget -q https://repo.hex.pm/builds/elixir/${1}${2}.zip
 unzip -d .setup-elixir/elixir ${1}${2}.zip
 rm ${1}${2}.zip
-echo "::add-path::$(pwd)/.setup-elixir/elixir/bin"
+echo "$(pwd)/.setup-elixir/elixir/bin" >> $GITHUB_PATH
diff --git a/dist/install-otp b/dist/install-otp
index b31347a..659803e 100755
--- a/dist/install-otp
+++ b/dist/install-otp
@@ -9,4 +9,4 @@ mkdir -p .setup-elixir/otp
 tar zxf otp.tar.gz -C .setup-elixir/otp --strip-components=1
 rm otp.tar.gz
 .setup-elixir/otp/Install -minimal $(pwd)/.setup-elixir/otp
-echo "::add-path::$(pwd)/.setup-elixir/otp/bin"
+echo "$(pwd)/.setup-elixir/otp/bin" >> $GITHUB_PATH
diff --git a/package-lock.json b/package-lock.json
index 6856ea9..2b54818 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,9 +5,9 @@
   "requires": true,
   "dependencies": {
     "@actions/core": {
-      "version": "1.2.4",
-      "resolved": "https://registry.npmjs.org/@actions/core/-/core-1.2.4.tgz",
-      "integrity": "sha512-YJCEq8BE3CdN8+7HPZ/4DxJjk/OkZV2FFIf+DlZTC/4iBlzYCD5yjRR6eiOS5llO11zbRltIRuKAjMKaWTE6cg=="
+      "version": "1.2.6",
+      "resolved": "https://registry.npmjs.org/@actions/core/-/core-1.2.6.tgz",
+      "integrity": "sha512-ZQYitnqiyBc3D+k7LsgSBmMDVkOVidaagDG7j3fOym77jNunWRuYx7VSHa9GNfFZh+zh61xsCjRj4JxMZlDqTA=="
     },
     "@actions/exec": {
       "version": "1.0.4",
diff --git a/src/install-elixir b/src/install-elixir
index d31c8ce..3d471cc 100755
--- a/src/install-elixir
+++ b/src/install-elixir
@@ -7,4 +7,4 @@ cd $RUNNER_TEMP
 wget -q https://repo.hex.pm/builds/elixir/${1}${2}.zip
 unzip -d .setup-elixir/elixir ${1}${2}.zip
 rm ${1}${2}.zip
-echo "::add-path::$(pwd)/.setup-elixir/elixir/bin"
+echo "$(pwd)/.setup-elixir/elixir/bin" >> $GITHUB_PATH
diff --git a/src/install-otp b/src/install-otp
index b31347a..659803e 100755
--- a/src/install-otp
+++ b/src/install-otp
@@ -9,4 +9,4 @@ mkdir -p .setup-elixir/otp
 tar zxf otp.tar.gz -C .setup-elixir/otp --strip-components=1
 rm otp.tar.gz
 .setup-elixir/otp/Install -minimal $(pwd)/.setup-elixir/otp
-echo "::add-path::$(pwd)/.setup-elixir/otp/bin"
+echo "$(pwd)/.setup-elixir/otp/bin" >> $GITHUB_PATH