diff --git a/backend/src/main/java/org/raddatz/familienarchiv/service/DocumentVersionService.java b/backend/src/main/java/org/raddatz/familienarchiv/service/DocumentVersionService.java
index 8d595478..70720551 100644
--- a/backend/src/main/java/org/raddatz/familienarchiv/service/DocumentVersionService.java
+++ b/backend/src/main/java/org/raddatz/familienarchiv/service/DocumentVersionService.java
@@ -1,7 +1,7 @@
 package org.raddatz.familienarchiv.service;
 
-import com.fasterxml.jackson.core.type.TypeReference;
-import com.fasterxml.jackson.databind.ObjectMapper;
+import tools.jackson.core.type.TypeReference;
+import tools.jackson.databind.ObjectMapper;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.raddatz.familienarchiv.dto.DocumentVersionSummary;
diff --git a/backend/src/test/java/org/raddatz/familienarchiv/service/DocumentVersionServiceTest.java b/backend/src/test/java/org/raddatz/familienarchiv/service/DocumentVersionServiceTest.java
index 992cf6d4..cb75cfd0 100644
--- a/backend/src/test/java/org/raddatz/familienarchiv/service/DocumentVersionServiceTest.java
+++ b/backend/src/test/java/org/raddatz/familienarchiv/service/DocumentVersionServiceTest.java
@@ -1,7 +1,6 @@
 package org.raddatz.familienarchiv.service;
 
-import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
+import tools.jackson.databind.ObjectMapper;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
@@ -41,8 +40,7 @@ class DocumentVersionServiceTest {
 
     @BeforeEach
     void setUp() {
-        ObjectMapper mapper = new ObjectMapper().registerModule(new JavaTimeModule());
-        versionService = new DocumentVersionService(versionRepository, userService, mapper);
+        versionService = new DocumentVersionService(versionRepository, userService, new ObjectMapper());
     }
 
     @BeforeEach
@@ -128,7 +126,7 @@ class DocumentVersionServiceTest {
         authenticateAs("user1");
         when(userService.findByUsername("user1")).thenReturn(stubUser("user1"));
 
-        ObjectMapper mapper = new ObjectMapper().registerModule(new JavaTimeModule());
+        ObjectMapper mapper = new ObjectMapper();
         Document oldDoc = Document.builder().id(UUID.randomUUID()).title("Alt").build();
         String oldSnapshot = mapper.writeValueAsString(oldDoc);
 
@@ -158,7 +156,7 @@ class DocumentVersionServiceTest {
         authenticateAs("user1");
         when(userService.findByUsername("user1")).thenReturn(stubUser("user1"));
 
-        ObjectMapper mapper = new ObjectMapper().registerModule(new JavaTimeModule());
+        ObjectMapper mapper = new ObjectMapper();
         UUID docId = UUID.randomUUID();
         Document oldDoc = Document.builder().id(docId).title("Same").location("Berlin").build();
         String oldSnapshot = mapper.writeValueAsString(oldDoc);
@@ -185,7 +183,7 @@ class DocumentVersionServiceTest {
         authenticateAs("user1");
         when(userService.findByUsername("user1")).thenReturn(stubUser("user1"));
 
-        ObjectMapper mapper = new ObjectMapper().registerModule(new JavaTimeModule());
+        ObjectMapper mapper = new ObjectMapper();
         UUID docId = UUID.randomUUID();
         Person oldSender = Person.builder().id(UUID.randomUUID()).firstName("A").lastName("B").build();
         Document oldDoc = Document.builder().id(docId).title("T").sender(oldSender).build();
@@ -213,7 +211,7 @@ class DocumentVersionServiceTest {
         authenticateAs("user1");
         when(userService.findByUsername("user1")).thenReturn(stubUser("user1"));
 
-        ObjectMapper mapper = new ObjectMapper().registerModule(new JavaTimeModule());
+        ObjectMapper mapper = new ObjectMapper();
         UUID docId = UUID.randomUUID();
         Person receiver1 = Person.builder().id(UUID.randomUUID()).firstName("A").lastName("B").build();
         Document oldDoc = Document.builder().id(docId).title("T").receivers(Set.of(receiver1)).build();
@@ -240,7 +238,7 @@ class DocumentVersionServiceTest {
         authenticateAs("user1");
         when(userService.findByUsername("user1")).thenReturn(stubUser("user1"));
 
-        ObjectMapper mapper = new ObjectMapper().registerModule(new JavaTimeModule());
+        ObjectMapper mapper = new ObjectMapper();
         UUID docId = UUID.randomUUID();
         Tag tag = Tag.builder().id(UUID.randomUUID()).name("Familie").build();
         Document oldDoc = Document.builder().id(docId).title("T").tags(Set.of(tag)).build();