diff --git a/espree.js b/espree.js
index dcc60c3a..d8069528 100644
--- a/espree.js
+++ b/espree.js
@@ -172,6 +172,6 @@ exports.VisitorKeys = (function() {
     return require("eslint-visitor-keys").KEYS;
 }());
 
-exports.getLatestEcmaVersion = getLatestEcmaVersion;
+exports.latestEcmaVersion = getLatestEcmaVersion();
 
-exports.getSupportedEcmaVersions = getSupportedEcmaVersions;
+exports.supportedEcmaVersions = getSupportedEcmaVersions();
diff --git a/tests/lib/supported-ecmaversions.js b/tests/lib/supported-ecmaversions.js
index bdcd6c06..650a93f0 100644
--- a/tests/lib/supported-ecmaversions.js
+++ b/tests/lib/supported-ecmaversions.js
@@ -18,23 +18,15 @@ const assert = require("assert"),
 
 describe("getLatestEcmaVersion()", () => {
     it("should return the latest supported ecmaVersion", () => {
-        assert.strictEqual(espree.getLatestEcmaVersion(), 11);
+        assert.strictEqual(espree.latestEcmaVersion, 11);
     });
 });
 
 describe("getSupportedEcmaVersions()", () => {
     it("should return an array of all supported versions", () => {
         assert.deepStrictEqual(
-            espree.getSupportedEcmaVersions(),
+            espree.supportedEcmaVersions,
             [3, 5, 6, 7, 8, 9, 10, 11]
         );
     });
-
-    it("the array of supported versions should not be mutable by reference", () => {
-        const supportedVersions = espree.getSupportedEcmaVersions();
-        const originalValue = [...supportedVersions];
-
-        supportedVersions.push("a", "b", "c");
-        assert.deepStrictEqual(espree.getSupportedEcmaVersions(), originalValue);
-    });
 });