diff --git a/src/main/kotlin/org/gitanimals/guild/domain/AbstractTime.kt b/src/main/kotlin/org/gitanimals/guild/domain/AbstractTime.kt
index ff15c58..c7f41a4 100644
--- a/src/main/kotlin/org/gitanimals/guild/domain/AbstractTime.kt
+++ b/src/main/kotlin/org/gitanimals/guild/domain/AbstractTime.kt
@@ -14,7 +14,7 @@ import java.time.Instant
 abstract class AbstractTime(
     @CreatedDate
     @Column(name = "created_at")
-    val createdAt: Instant = Instant.now(),
+    var createdAt: Instant = Instant.now(),
 
     @LastModifiedDate
     @Column(name = "modified_at")
diff --git a/src/main/kotlin/org/gitanimals/render/domain/AbstractTime.kt b/src/main/kotlin/org/gitanimals/render/domain/AbstractTime.kt
index 40c3be4..99a1fc9 100644
--- a/src/main/kotlin/org/gitanimals/render/domain/AbstractTime.kt
+++ b/src/main/kotlin/org/gitanimals/render/domain/AbstractTime.kt
@@ -14,7 +14,7 @@ import java.time.Instant
 abstract class AbstractTime(
     @CreatedDate
     @Column(name = "created_at")
-    val createdAt: Instant = Instant.now(),
+    var createdAt: Instant = Instant.now(),
 
     @LastModifiedDate
     @Column(name = "modified_at")