diff --git a/lib/installer.js b/lib/installer.js
index 4829000..6c44c91 100644
--- a/lib/installer.js
+++ b/lib/installer.js
@@ -22,6 +22,8 @@ const tc = __importStar(require("@actions/tool-cache"));
 const os = __importStar(require("os"));
 const path = __importStar(require("path"));
 const util = __importStar(require("util"));
+const semver = __importStar(require("semver"));
+const httpm = __importStar(require("typed-rest-client/HttpClient"));
 let osPlat = os.platform();
 let osArch = os.arch();
 if (!tempDirectory) {
@@ -42,6 +44,7 @@ if (!tempDirectory) {
 }
 function getGo(version) {
     return __awaiter(this, void 0, void 0, function* () {
+        version = yield determineVersion(version);
         // check cache
         let toolPath;
         toolPath = tc.find('go', normalizeVersion(version));
@@ -127,8 +130,59 @@ function normalizeVersion(version) {
         return version.concat('.0.0');
     }
     else if (versionPart[2] == null) {
+        // handle beta and rc: 1.10beta1 => 1.10.0-beta1, 1.10rc1 => 1.10.0-rc1
+        if (versionPart[1].includes('beta') || versionPart[1].includes('rc')) {
+            versionPart[1] = versionPart[1]
+                .replace('beta', '.0-beta')
+                .replace('rc', '.0-rc');
+            return versionPart.join('.');
+        }
         //append patch version if not available
         return version.concat('.0');
     }
     return version;
 }
+function determineVersion(version) {
+    return __awaiter(this, void 0, void 0, function* () {
+        if (!version.endsWith('.x')) {
+            return version;
+        }
+        return yield getLatestVersion(version);
+    });
+}
+function getLatestVersion(version) {
+    return __awaiter(this, void 0, void 0, function* () {
+        // clean .x syntax: 1.10.x -> 1.10
+        const trimmedVersion = version.slice(0, version.length - 2);
+        const versions = yield getPossibleVersions(trimmedVersion);
+        if (version.length === 0) {
+            return trimmedVersion;
+        }
+        return versions[0];
+    });
+}
+function unique(value, index, self) {
+    return self.indexOf(value) === index;
+}
+function getAvailableVersions() {
+    return __awaiter(this, void 0, void 0, function* () {
+        let http = new httpm.HttpClient('setup-java');
+        let contents = yield (yield http.get('https://api.github.com/repos/golang/go/git/refs/tags')).readBody();
+        const matches = contents.match(/go\d+\.[\w\.]+/g) || [];
+        const versions = matches
+            .map(version => version.replace('go', ''))
+            .filter(unique);
+        return versions;
+    });
+}
+function getPossibleVersions(version) {
+    return __awaiter(this, void 0, void 0, function* () {
+        const versions = yield getAvailableVersions();
+        const possibleVersions = versions.filter(v => v.startsWith(version));
+        const versionMap = new Map();
+        possibleVersions.forEach(v => versionMap.set(normalizeVersion(v), v));
+        return Array.from(versionMap.keys())
+            .sort(semver.rcompare)
+            .map(v => versionMap.get(v));
+    });
+}
diff --git a/src/installer.ts b/src/installer.ts
index cb33548..857e93f 100644
--- a/src/installer.ts
+++ b/src/installer.ts
@@ -5,6 +5,8 @@ import * as tc from '@actions/tool-cache';
 import * as os from 'os';
 import * as path from 'path';
 import * as util from 'util';
+import * as semver from 'semver';
+import * as httpm from 'typed-rest-client/HttpClient';
 
 let osPlat: string = os.platform();
 let osArch: string = os.arch();
@@ -25,6 +27,8 @@ if (!tempDirectory) {
 }
 
 export async function getGo(version: string) {
+  version = await determineVersion(version);
+
   // check cache
   let toolPath: string;
   toolPath = tc.find('go', normalizeVersion(version));
@@ -123,8 +127,67 @@ function normalizeVersion(version: string): string {
     //append minor and patch version if not available
     return version.concat('.0.0');
   } else if (versionPart[2] == null) {
+    // handle beta and rc: 1.10beta1 => 1.10.0-beta1, 1.10rc1 => 1.10.0-rc1
+    if (versionPart[1].includes('beta') || versionPart[1].includes('rc')) {
+      versionPart[1] = versionPart[1]
+        .replace('beta', '.0-beta')
+        .replace('rc', '.0-rc');
+      return versionPart.join('.');
+    }
+
     //append patch version if not available
     return version.concat('.0');
   }
   return version;
 }
+
+async function determineVersion(version: string): Promise<string> {
+  if (!version.endsWith('.x')) {
+    return version;
+  }
+
+  return await getLatestVersion(version);
+}
+
+async function getLatestVersion(version: string): Promise<string> {
+  // clean .x syntax: 1.10.x -> 1.10
+  const trimmedVersion = version.slice(0, version.length - 2);
+
+  const versions = await getPossibleVersions(trimmedVersion);
+
+  if (version.length === 0) {
+    return trimmedVersion;
+  }
+
+  return versions[0];
+}
+
+function unique(value: string, index: number, self: string[]) {
+  return self.indexOf(value) === index;
+}
+
+async function getAvailableVersions(): Promise<string[]> {
+  let http: httpm.HttpClient = new httpm.HttpClient('setup-java');
+  let contents = await (await http.get(
+    'https://api.github.com/repos/golang/go/git/refs/tags'
+  )).readBody();
+
+  const matches = contents.match(/go\d+\.[\w\.]+/g) || [];
+  const versions = matches
+    .map(version => version.replace('go', ''))
+    .filter(unique);
+
+  return versions;
+}
+
+async function getPossibleVersions(version: string): Promise<string[]> {
+  const versions = await getAvailableVersions();
+  const possibleVersions = versions.filter(v => v.startsWith(version));
+
+  const versionMap = new Map();
+  possibleVersions.forEach(v => versionMap.set(normalizeVersion(v), v));
+
+  return Array.from(versionMap.keys())
+    .sort(semver.rcompare)
+    .map(v => versionMap.get(v));
+}