diff --git a/cameleer-server-core/src/test/java/com/cameleer/server/core/runtime/DirtyStateCalculatorTest.java b/cameleer-server-core/src/test/java/com/cameleer/server/core/runtime/DirtyStateCalculatorTest.java
index df0e9042..986e38d6 100644
--- a/cameleer-server-core/src/test/java/com/cameleer/server/core/runtime/DirtyStateCalculatorTest.java
+++ b/cameleer-server-core/src/test/java/com/cameleer/server/core/runtime/DirtyStateCalculatorTest.java
@@ -2,6 +2,7 @@ package com.cameleer.server.core.runtime;
 
 import com.cameleer.common.model.ApplicationConfig;
 import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
 import org.junit.jupiter.api.Test;
 
 import java.util.Map;
@@ -11,7 +12,8 @@ import static org.assertj.core.api.Assertions.assertThat;
 
 class DirtyStateCalculatorTest {
 
-    private static final DirtyStateCalculator CALC = new DirtyStateCalculator(new ObjectMapper());
+    private static final DirtyStateCalculator CALC = new DirtyStateCalculator(
+            new ObjectMapper().registerModule(new JavaTimeModule()));
 
     @Test
     void noSnapshot_meansEverythingDirty() {