diff --git a/LaunchServer/source/auth/provider/AuthProvider.java b/LaunchServer/source/auth/provider/AuthProvider.java
index 7e5e4f9..c4914ce 100644
--- a/LaunchServer/source/auth/provider/AuthProvider.java
+++ b/LaunchServer/source/auth/provider/AuthProvider.java
@@ -21,9 +21,9 @@
         registerProvider("reject", RejectAuthProvider::new);
         registerProvider("delegate", DelegateAuthProvider::new);
 
-        // Auth providers that doesn't do nothing :D
         registerProvider("file", FileAuthProvider::new);
         registerProvider("mojang", MojangAuthProvider::new);
+        registerProvider("authlib", AuthlibAuthProvider::new);
         registerProvider("mysql", MySQLAuthProvider::new);
         registerProvider("mysql-bcrypt", MySQLBcryptAuthProvider::new);
         registerProvider("mysql-8", MySQL8AuthProvider::new);
diff --git a/LaunchServer/source/auth/provider/AuthlibAuthProvider.java b/LaunchServer/source/auth/provider/AuthlibAuthProvider.java
new file mode 100644
index 0000000..251ad43
--- /dev/null
+++ b/LaunchServer/source/auth/provider/AuthlibAuthProvider.java
@@ -0,0 +1,118 @@
+package launchserver.auth.provider;
+
+import com.eclipsesource.json.Json;
+import com.eclipsesource.json.JsonObject;
+import com.eclipsesource.json.JsonValue;
+import com.eclipsesource.json.WriterConfig;
+import launcher.helper.IOHelper;
+import launcher.helper.LogHelper;
+import launcher.serialize.config.entry.BlockConfigEntry;
+import launcher.serialize.config.entry.StringConfigEntry;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.HttpURLConnection;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
+import java.util.UUID;
+import java.util.regex.Pattern;
+
+public class AuthlibAuthProvider extends AuthProvider
+{
+    private static final Pattern UUID_REGEX = Pattern.compile("(\\w{8})(\\w{4})(\\w{4})(\\w{4})(\\w{12})");
+    private static final java.net.URL URL;
+    private static String authUrl;
+
+    // TODO:
+    //  https://wiki.vg/Authentication#Refresh
+    //  https://wiki.vg/Authentication#Signout
+    static
+    {
+        try
+        {
+            // Docs: https://wiki.vg/Authentication#Authenticate
+            URL = new URL(authUrl); // "https://authserver.mojang.com/authenticate"
+        }
+        catch (MalformedURLException e)
+        {
+            throw new InternalError(e);
+        }
+    }
+
+    AuthlibAuthProvider(BlockConfigEntry block)
+    {
+        super(block);
+        authUrl = block.getEntryValue("authUrl", StringConfigEntry.class);
+    }
+
+    public static JsonObject makeAuthlibRequest(URL url, JsonObject request) throws IOException
+    {
+        HttpURLConnection connection = request == null ?
+                (HttpURLConnection) IOHelper.newConnection(url) :
+                IOHelper.newConnectionPost(url);
+
+        // Make request
+        if (request != null)
+        {
+            connection.setRequestProperty("Content-Type", "application/json");
+            try (OutputStream output = connection.getOutputStream())
+            {
+                output.write(request.toString(WriterConfig.MINIMAL).getBytes(StandardCharsets.UTF_8));
+            }
+        }
+        connection.getResponseCode(); // Actually make request
+
+        // Read response
+        InputStream errorInput = connection.getErrorStream();
+        try (InputStream input = errorInput == null ? connection.getInputStream() : errorInput)
+        {
+            String charset = connection.getContentEncoding();
+            Charset charsetObject = charset == null ?
+                    IOHelper.UNICODE_CHARSET : Charset.forName(charset);
+
+            // Parse response
+            String json = new String(IOHelper.read(input), charsetObject);
+            LogHelper.subDebug("Raw Mojang response: '" + json + '\'');
+            return json.isEmpty() ? null : Json.parse(json).asObject();
+        }
+    }
+
+    @Override
+    public AuthProviderResult auth(String login, String password, String ip) throws Throwable
+    {
+        JsonObject request = Json.object().
+                add("agent", Json.object().add("name", "Minecraft").add("version", 1)).
+                add("username", login).add("password", password);
+
+        // Verify there's no error
+        JsonObject response = makeAuthlibRequest(URL, request);
+        if (response == null)
+        {
+            authError("Empty authlib response");
+        }
+        JsonValue errorMessage = response.get("errorMessage");
+        if (errorMessage != null)
+        {
+            authError(errorMessage.asString());
+        }
+
+        // Parse JSON data
+        JsonObject selectedProfile = response.get("selectedProfile").asObject();
+        String username = selectedProfile.get("name").asString();
+        String accessToken = response.get("clientToken").asString();
+        UUID uuid = UUID.fromString(UUID_REGEX.matcher(selectedProfile.get("id").asString()).replaceFirst("$1-$2-$3-$4-$5"));
+        String launcherToken = response.get("accessToken").asString();
+
+        // We're done
+        return new AuthlibAuthProviderResult(username, accessToken, uuid, launcherToken);
+    }
+
+    @Override
+    public void close()
+    {
+        // Do nothing
+    }
+}
diff --git a/LaunchServer/source/auth/provider/AuthlibAuthProviderResult.java b/LaunchServer/source/auth/provider/AuthlibAuthProviderResult.java
new file mode 100644
index 0000000..2636fb7
--- /dev/null
+++ b/LaunchServer/source/auth/provider/AuthlibAuthProviderResult.java
@@ -0,0 +1,16 @@
+package launchserver.auth.provider;
+
+import java.util.UUID;
+
+public class AuthlibAuthProviderResult extends AuthProviderResult
+{
+    public final UUID uuid;
+    public final String launcherToken;
+
+    AuthlibAuthProviderResult(String username, String accessToken, UUID uuid, String launcherToken)
+    {
+        super(username, accessToken);
+        this.uuid = uuid;
+        this.launcherToken = launcherToken;
+    }
+}
diff --git a/LaunchServer/source/texture/AuthlibTextureProvider.java b/LaunchServer/source/texture/AuthlibTextureProvider.java
new file mode 100644
index 0000000..ff17e62
--- /dev/null
+++ b/LaunchServer/source/texture/AuthlibTextureProvider.java
@@ -0,0 +1,180 @@
+package launchserver.texture;
+
+import com.eclipsesource.json.Json;
+import com.eclipsesource.json.JsonArray;
+import com.eclipsesource.json.JsonObject;
+import com.eclipsesource.json.JsonValue;
+import launcher.LauncherAPI;
+import launcher.client.PlayerProfile.Texture;
+import launcher.helper.IOHelper;
+import launcher.helper.JVMHelper;
+import launcher.helper.LogHelper;
+import launcher.helper.VerifyHelper;
+import launcher.serialize.config.entry.BlockConfigEntry;
+import launcher.serialize.config.entry.StringConfigEntry;
+import launchserver.auth.provider.MojangAuthProvider;
+
+import java.net.URL;
+import java.nio.charset.StandardCharsets;
+import java.util.Base64;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.UUID;
+
+public class AuthlibTextureProvider extends TextureProvider
+{
+    // Instance
+    private final String setUuidURL;
+    private final String setProfileURL;
+
+    @LauncherAPI
+    public static final long CACHE_DURATION_MS = VerifyHelper.verifyLong(
+            Long.parseLong(System.getProperty("launcher.mysql.cacheDurationHours", Integer.toString(24))),
+            VerifyHelper.L_NOT_NEGATIVE, "launcher.mysql.cacheDurationHours can't be < 0") * 60L * 60L * 1000L;
+
+    // Instance
+    private final Map<String, CacheData> cache = new HashMap<>(1024);
+
+    public AuthlibTextureProvider(BlockConfigEntry block)
+    {
+        super(block);
+
+        // "https://api.mojang.com/users/profiles/minecraft/"
+        setUuidURL = block.getEntryValue("usersURL", StringConfigEntry.class);
+        // "https://sessionserver.mojang.com/session/minecraft/profile/"
+        setProfileURL = block.getEntryValue("profileURL", StringConfigEntry.class);
+
+        // TODO: Verify
+        //IOHelper.verifyURL(setUuidURL);
+        //IOHelper.verifyURL(setProfileURL);
+    }
+
+    @Override
+    public void close()
+    {
+        // Do nothing
+    }
+
+    @Override
+    public synchronized Texture getCloakTexture(UUID uuid, String username)
+    {
+        return getCached(uuid, username).skin;
+    }
+
+    @Override
+    public synchronized Texture getSkinTexture(UUID uuid, String username)
+    {
+        return getCached(uuid, username).cloak;
+    }
+
+    private CacheData getCached(UUID uuid, String username)
+    {
+        CacheData result = cache.get(username);
+
+        // Have cached result?
+        if (result != null && System.currentTimeMillis() < result.until)
+        {
+            if (result.exc != null)
+            {
+                JVMHelper.UNSAFE.throwException(result.exc);
+            }
+            return result;
+        }
+
+        try
+        {
+            // TODO Don't query UUID by username if using mojang auth handler (not implemented yet)
+            URL uuidURL = new URL(setUuidURL + IOHelper.urlEncode(username));
+            JsonObject uuidResponse = MojangAuthProvider.makeMojangRequest(uuidURL, null);
+            if (uuidResponse == null)
+            {
+                throw new IllegalArgumentException("Empty UUID response");
+            }
+            String uuidResolved = uuidResponse.get("id").asString();
+
+            // Obtain player profile
+            URL profileURL = new URL(setProfileURL + uuidResolved);
+            JsonObject profileResponse = MojangAuthProvider.makeMojangRequest(profileURL, null);
+            if (profileResponse == null)
+            {
+                throw new IllegalArgumentException("Empty Authlib response");
+            }
+            JsonArray properties = (JsonArray) profileResponse.get("properties");
+            if (properties == null)
+            {
+                LogHelper.subDebug("No properties");
+                return cache(username, null, null, null);
+            }
+
+            // Find textures property
+            JsonObject texturesProperty = null;
+            for (JsonValue property : properties)
+            {
+                JsonObject property0 = property.asObject();
+                if (property0.get("name").asString().equals("textures"))
+                {
+                    byte[] asBytes = Base64.getDecoder().decode(property0.get("value").asString());
+                    String asString = new String(asBytes, StandardCharsets.UTF_8);
+                    texturesProperty = Json.parse(asString).asObject();
+                    break;
+                }
+            }
+            if (texturesProperty == null)
+            {
+                LogHelper.subDebug("No textures property");
+                return cache(username, null, null, null);
+            }
+
+            // Extract skin&cloak texture
+            texturesProperty = (JsonObject) texturesProperty.get("textures");
+            JsonObject skinProperty = (JsonObject) texturesProperty.get("SKIN");
+            Texture skinTexture = skinProperty == null ? null : new Texture(skinProperty.get("url").asString(), false);
+            JsonObject cloakProperty = (JsonObject) texturesProperty.get("CAPE");
+            Texture cloakTexture = cloakProperty == null ? null : new Texture(cloakProperty.get("url").asString(), true);
+
+            // We're done
+            return cache(username, skinTexture, cloakTexture, null);
+        }
+        catch (Throwable exc)
+        {
+            cache(username, null, null, exc);
+            JVMHelper.UNSAFE.throwException(exc);
+        }
+
+        // We're dones
+        return result;
+    }
+
+    private CacheData cache(String username, Texture skin, Texture cloak, Throwable exc)
+    {
+        long until = CACHE_DURATION_MS == 0L ? Long.MIN_VALUE : System.currentTimeMillis() + CACHE_DURATION_MS;
+        CacheData data = exc == null ? new CacheData(skin, cloak, until) : new CacheData(exc, until);
+        if (CACHE_DURATION_MS != 0L)
+        {
+            cache.put(username, data);
+        }
+        return data;
+    }
+
+    private static final class CacheData
+    {
+        private final Texture skin, cloak;
+        private final Throwable exc;
+        private final long until;
+
+        private CacheData(Texture skin, Texture cloak, long until)
+        {
+            this.skin = skin;
+            this.cloak = cloak;
+            this.until = until;
+            exc = null;
+        }
+
+        private CacheData(Throwable exc, long until)
+        {
+            this.exc = exc;
+            this.until = until;
+            skin = cloak = null;
+        }
+    }
+}
diff --git a/LaunchServer/source/texture/TextureProvider.java b/LaunchServer/source/texture/TextureProvider.java
index e6a3c0b..97c344b 100644
--- a/LaunchServer/source/texture/TextureProvider.java
+++ b/LaunchServer/source/texture/TextureProvider.java
@@ -20,6 +20,7 @@
     {
         registerProvider("void", VoidTextureProvider::new);
         registerProvider("delegate", DelegateTextureProvider::new);
+        registerProvider("authlib", AuthlibTextureProvider::new);
 
         // Auth providers that doesn't do nothing :D
         registerProvider("mojang", MojangTextureProvider::new);
diff --git a/buildnumber b/buildnumber
index da922d9..fd010a6 100644
--- a/buildnumber
+++ b/buildnumber
@@ -1 +1 @@
-539, 30.04.2021
\ No newline at end of file
+540, 30.04.2021
\ No newline at end of file