diff --git a/.github/actions/install-llvm/dist/index.js b/.github/actions/install-llvm/dist/index.js
index 6c13f27d7..2f9c03ba7 100644
--- a/.github/actions/install-llvm/dist/index.js
+++ b/.github/actions/install-llvm/dist/index.js
@@ -19,7 +19,13 @@ module.exports =
 /******/ 		};
 /******/
 /******/ 		// Execute the module function
-/******/ 		modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);
+/******/ 		var threw = true;
+/******/ 		try {
+/******/ 			modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);
+/******/ 			threw = false;
+/******/ 		} finally {
+/******/ 			if(threw) delete installedModules[moduleId];
+/******/ 		}
 /******/
 /******/ 		// Flag the module as loaded
 /******/ 		module.l = true;
@@ -1069,6 +1075,32 @@ exports._readLinuxVersionFile = _readLinuxVersionFile;
 
 /***/ }),
 
+/***/ 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) {
 
@@ -1076,6 +1108,42 @@ 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
+
+/***/ }),
+
 /***/ 104:
 /***/ (function(__unusedmodule, __webpack_exports__, __webpack_require__) {
 
@@ -1123,7 +1191,7 @@ async function execute(cmd) {
             let llvmCachedPath = tc.find("llvm", "8.0.1", "windows-x64");
             if(!llvmCachedPath) {
                 let _7zPath = path.join(__dirname, '..', 'externals', '7zr.exe');
-                llvmCachedPath = await tc.downloadTool("https://github.com/mun-lang/llvm-package-windows/releases/download/v8.0.1/llvm-8.0.1-windows-x64-msvc15.7z")
+                llvmCachedPath = await tc.downloadTool("https://github.com/mun-lang/llvm-package-windows/releases/download/v8.0.1/llvm-8.0.1-windows-x64-msvc16.7z")
                     .then(downloadPath => tc.extract7z(downloadPath, null, _7zPath))
                     .then(extractPath => tc.cacheDir(extractPath, "llvm", "8.0.1", "windows-x64"));
             }
@@ -3080,6 +3148,7 @@ 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
  *
@@ -3133,28 +3202,14 @@ 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')
@@ -3188,6 +3243,8 @@ 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));
 /**
@@ -3214,9 +3271,17 @@ 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;
 /**
@@ -3232,7 +3297,13 @@ 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;
@@ -3392,7 +3463,6 @@ function getState(name) {
 exports.getState = getState;
 //# sourceMappingURL=core.js.map
 
-
 /***/ }),
 
 /***/ 533:
@@ -3443,6 +3513,7 @@ class HTTPError extends Error {
 }
 exports.HTTPError = HTTPError;
 const IS_WINDOWS = process.platform === 'win32';
+const IS_MAC = process.platform === 'darwin';
 const userAgent = 'actions/tool-cache';
 /**
  * Download a tool from an url and stream it into a file
@@ -3658,6 +3729,36 @@ function extractTar(file, dest, flags = 'xz') {
     });
 }
 exports.extractTar = extractTar;
+/**
+ * Extract a xar compatible archive
+ *
+ * @param file     path to the archive
+ * @param dest     destination directory. Optional.
+ * @param flags    flags for the xar. Optional.
+ * @returns        path to the destination directory
+ */
+function extractXar(file, dest, flags = []) {
+    return __awaiter(this, void 0, void 0, function* () {
+        assert_1.ok(IS_MAC, 'extractXar() not supported on current OS');
+        assert_1.ok(file, 'parameter "file" is required');
+        dest = yield _createExtractFolder(dest);
+        let args;
+        if (flags instanceof Array) {
+            args = flags;
+        }
+        else {
+            args = [flags];
+        }
+        args.push('-x', '-C', dest, '-f', file);
+        if (core.isDebug()) {
+            args.push('-v');
+        }
+        const xarPath = yield io.which('xar', true);
+        yield exec_1.exec(`"${xarPath}"`, _unique(args));
+        return dest;
+    });
+}
+exports.extractXar = extractXar;
 /**
  * Extract a zip
  *
@@ -3966,6 +4067,13 @@ function _getGlobal(key, defaultValue) {
     /* eslint-enable @typescript-eslint/no-explicit-any */
     return value !== undefined ? value : defaultValue;
 }
+/**
+ * Returns an array of unique values.
+ * @param values Values to make unique.
+ */
+function _unique(values) {
+    return Array.from(new Set(values));
+}
 //# sourceMappingURL=tool-cache.js.map
 
 /***/ }),
diff --git a/.github/actions/install-llvm/externals/7zr.exe b/.github/actions/install-llvm/externals/7zr.exe
index 04e96e723..bb1b30b90 100644
Binary files a/.github/actions/install-llvm/externals/7zr.exe and b/.github/actions/install-llvm/externals/7zr.exe differ
diff --git a/.github/actions/install-llvm/index.js b/.github/actions/install-llvm/index.js
index 6009b64f0..e6d56aed8 100644
--- a/.github/actions/install-llvm/index.js
+++ b/.github/actions/install-llvm/index.js
@@ -39,7 +39,7 @@ export async function execute(cmd) {
             let llvmCachedPath = tc.find("llvm", "8.0.1", "windows-x64");
             if(!llvmCachedPath) {
                 let _7zPath = path.join(__dirname, '..', 'externals', '7zr.exe');
-                llvmCachedPath = await tc.downloadTool("https://github.com/mun-lang/llvm-package-windows/releases/download/v8.0.1/llvm-8.0.1-windows-x64-msvc15.7z")
+                llvmCachedPath = await tc.downloadTool("https://github.com/mun-lang/llvm-package-windows/releases/download/v8.0.1/llvm-8.0.1-windows-x64-msvc16.7z")
                     .then(downloadPath => tc.extract7z(downloadPath, null, _7zPath))
                     .then(extractPath => tc.cacheDir(extractPath, "llvm", "8.0.1", "windows-x64"));
             }
diff --git a/.github/actions/install-llvm/package-lock.json b/.github/actions/install-llvm/package-lock.json
index 9b21758f5..860c8efbd 100644
--- a/.github/actions/install-llvm/package-lock.json
+++ b/.github/actions/install-llvm/package-lock.json
@@ -31,9 +31,9 @@
       "integrity": "sha512-J8KuFqVPr3p6U8W93DOXlXW6zFvrQAJANdS+vw0YhusLIq+bszW8zmK2Fh1C2kDPX8FMvwIl1OUcFgvJoXLbAg=="
     },
     "@actions/tool-cache": {
-      "version": "1.5.5",
-      "resolved": "https://registry.npmjs.org/@actions/tool-cache/-/tool-cache-1.5.5.tgz",
-      "integrity": "sha512-y/YO37BOaXzOEHpvoGZDLCwvg6XZWQ7Ala4Np4xzrKD1r48mff+K/GAmzXMejnApU7kgqC6lL/aCKTZDCrhdmw==",
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/@actions/tool-cache/-/tool-cache-1.6.0.tgz",
+      "integrity": "sha512-+fyEBImPD3m5I0o6DflCO0NHY180LPoX8Lo6y4Iez+V17kO8kfkH0VHxb8mUdmD6hn9dWA9Ch1JA20fXoIYUeQ==",
       "requires": {
         "@actions/core": "^1.2.3",
         "@actions/exec": "^1.0.0",
@@ -44,9 +44,9 @@
       }
     },
     "@zeit/ncc": {
-      "version": "0.20.5",
-      "resolved": "https://registry.npmjs.org/@zeit/ncc/-/ncc-0.20.5.tgz",
-      "integrity": "sha512-XU6uzwvv95DqxciQx+aOLhbyBx/13ky+RK1y88Age9Du3BlA4mMPCy13BGjayOrrumOzlq1XV3SD/BWiZENXlw=="
+      "version": "0.22.3",
+      "resolved": "https://registry.npmjs.org/@zeit/ncc/-/ncc-0.22.3.tgz",
+      "integrity": "sha512-jnCLpLXWuw/PAiJiVbLjA8WBC0IJQbFeUwF4I9M+23MvIxTxk5pD4Q8byQBSPmHQjz5aBoA7AKAElQxMpjrCLQ=="
     },
     "semver": {
       "version": "6.3.0",
diff --git a/.github/actions/install-llvm/package.json b/.github/actions/install-llvm/package.json
index 73109996d..9164d8c2c 100644
--- a/.github/actions/install-llvm/package.json
+++ b/.github/actions/install-llvm/package.json
@@ -11,8 +11,8 @@
   "license": "ISC",
   "dependencies": {
     "@actions/core": "^1.2.6",
-    "@actions/exec": "^1.0.1",
-    "@actions/tool-cache": "^1.1.2",
-    "@zeit/ncc": "^0.20.5"
+    "@actions/exec": "^1.0.4",
+    "@actions/tool-cache": "^1.6.0",
+    "@zeit/ncc": "^0.22.3"
   }
 }
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 90aa06755..3e60084a4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -38,7 +38,7 @@ jobs:
       matrix:
         config:
         - { os: "ubuntu-latest"}
-        - { os: "windows-2016"}
+        - { os: "windows-latest"}
         - { os: "macOS-latest"}
     steps:
       - uses: actions/checkout@v2
@@ -135,4 +135,3 @@ jobs:
         with:
           file: ${{ steps.coverage.outputs.report }}
           name: ${{ matrix.os }}
-  
\ No newline at end of file