diff --git a/botalka/src/main/kotlin/ru/vityaman/lms/botalka/core/model/Homework.kt b/botalka/src/main/kotlin/ru/vityaman/lms/botalka/core/model/Homework.kt
index 979d267..0799c5b 100644
--- a/botalka/src/main/kotlin/ru/vityaman/lms/botalka/core/model/Homework.kt
+++ b/botalka/src/main/kotlin/ru/vityaman/lms/botalka/core/model/Homework.kt
@@ -70,6 +70,10 @@ data class Homework(
         val deadlineMoment: OffsetDateTime,
     ) {
         init {
+            val maxDeadline = OffsetDateTime.parse("4096-08-08T08:08:08+03:00")
+            expect(deadlineMoment.isBefore(maxDeadline)) {
+                append("Homework deadline must be before $maxDeadline")
+            }
             expect(publicationMoment.plusMinutes(1).isBefore(deadlineMoment)) {
                 append("Homework must be published 1 minute before deadline")
             }