diff --git a/LaunchServer/src/main/java/ru/gravit/launchserver/response/update/LauncherResponse.java b/LaunchServer/src/main/java/ru/gravit/launchserver/response/update/LauncherResponse.java
index 4edaadd5..e48c91ed 100644
--- a/LaunchServer/src/main/java/ru/gravit/launchserver/response/update/LauncherResponse.java
+++ b/LaunchServer/src/main/java/ru/gravit/launchserver/response/update/LauncherResponse.java
@@ -5,6 +5,7 @@
 
 import ru.gravit.launcher.serialize.HInput;
 import ru.gravit.launcher.serialize.HOutput;
+import ru.gravit.launcher.serialize.SerializeLimits;
 import ru.gravit.launcher.serialize.signed.DigestBytesHolder;
 import ru.gravit.launchserver.LaunchServer;
 import ru.gravit.launchserver.response.Response;
@@ -25,7 +26,7 @@ public void reply() throws IOException {
             return;
         }
         Client client = server.sessionManager.getOrNewClient(session);
-        byte[] digest = input.readByteArray(0);
+        byte[] digest = input.readByteArray(SerializeLimits.MAX_DIGEST);
         if (!Arrays.equals(bytes.getDigest(), digest)) {
             writeNoError(output);
             output.writeBoolean(true);
diff --git a/libLauncher/src/main/java/ru/gravit/launcher/serialize/SerializeLimits.java b/libLauncher/src/main/java/ru/gravit/launcher/serialize/SerializeLimits.java
index 6732670d..77c05fa1 100644
--- a/libLauncher/src/main/java/ru/gravit/launcher/serialize/SerializeLimits.java
+++ b/libLauncher/src/main/java/ru/gravit/launcher/serialize/SerializeLimits.java
@@ -15,4 +15,6 @@ public class SerializeLimits {
     public static final int MAX_BATCH_SIZE = 128;
     @LauncherAPI
     public static final byte EXPECTED_BYTE = 0b01010101;
+    @LauncherAPI
+    public static final int MAX_DIGEST = 512;
 }