diff --git a/src/main/java/gg/agit/konect/domain/chat/dto/ChatMessageSendRequest.java b/src/main/java/gg/agit/konect/domain/chat/dto/ChatMessageSendRequest.java
index f0cd5418..c943c29e 100644
--- a/src/main/java/gg/agit/konect/domain/chat/dto/ChatMessageSendRequest.java
+++ b/src/main/java/gg/agit/konect/domain/chat/dto/ChatMessageSendRequest.java
@@ -4,9 +4,11 @@
 
 import io.swagger.v3.oas.annotations.media.Schema;
 import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Size;
 
 public record ChatMessageSendRequest(
     @NotBlank(message = "메시지 내용은 필수입니다.")
+    @Size(max = 1000, message = "1000자 이내로 입력해주세요.")
     @Schema(description = "메시지 내용", example = "투명 케이스가 끼워져 있었어요!", requiredMode = REQUIRED)
     String content
 ) {
diff --git a/src/main/java/gg/agit/konect/domain/chat/model/ChatMessage.java b/src/main/java/gg/agit/konect/domain/chat/model/ChatMessage.java
index b1c8a4b7..d747d6db 100644
--- a/src/main/java/gg/agit/konect/domain/chat/model/ChatMessage.java
+++ b/src/main/java/gg/agit/konect/domain/chat/model/ChatMessage.java
@@ -31,7 +31,7 @@ public class ChatMessage extends BaseEntity {
     private Integer id;
 
     @NotNull
-    @Column(name = "content", nullable = false, columnDefinition = "TEXT")
+    @Column(name = "content", nullable = false, length = 1000)
     private String content;
 
     @Column(name = "is_read", nullable = false)
diff --git a/src/main/java/gg/agit/konect/domain/chat/model/ChatRoom.java b/src/main/java/gg/agit/konect/domain/chat/model/ChatRoom.java
index ff61c5aa..152c87d6 100644
--- a/src/main/java/gg/agit/konect/domain/chat/model/ChatRoom.java
+++ b/src/main/java/gg/agit/konect/domain/chat/model/ChatRoom.java
@@ -33,7 +33,7 @@ public class ChatRoom extends BaseEntity {
     @Column(name = "id", nullable = false, updatable = false, unique = true)
     private Integer id;
 
-    @Column(name = "last_message_content", columnDefinition = "TEXT")
+    @Column(name = "last_message_content", length = 1000)
     private String lastMessageContent;
 
     @Column(name = "last_message_sent_at")
diff --git a/src/main/resources/db/migration/V17__alter_chat_message_content_length.sql b/src/main/resources/db/migration/V17__alter_chat_message_content_length.sql
new file mode 100644
index 00000000..10553d1a
--- /dev/null
+++ b/src/main/resources/db/migration/V17__alter_chat_message_content_length.sql
@@ -0,0 +1 @@
+ALTER TABLE chat_message MODIFY COLUMN content VARCHAR(1000) NOT NULL;