diff --git a/src/main/java/com/example/nto/controller/EmployeeController.java b/src/main/java/com/example/nto/controller/EmployeeController.java
index 086c52b..ff67c53 100644
--- a/src/main/java/com/example/nto/controller/EmployeeController.java
+++ b/src/main/java/com/example/nto/controller/EmployeeController.java
@@ -47,7 +47,7 @@ public class EmployeeController {
 
     @PatchMapping("/{login}/open")
     public ResponseEntity<Boolean> openEmployee(@PathVariable String login, @RequestBody CodeDto value) {
-        Long code = value.getValue();
+        String code = value.getValue();
         return ResponseEntity.ok(employeeService.enterEmployee(login, code));
     }
 
diff --git a/src/main/java/com/example/nto/dto/CodeDto.java b/src/main/java/com/example/nto/dto/CodeDto.java
index ae2cf8f..0618084 100644
--- a/src/main/java/com/example/nto/dto/CodeDto.java
+++ b/src/main/java/com/example/nto/dto/CodeDto.java
@@ -5,5 +5,5 @@ import lombok.Data;
 
 @Data
 public class CodeDto {
-    private Long value;
+    private String value;
 }
diff --git a/src/main/java/com/example/nto/entity/Code.java b/src/main/java/com/example/nto/entity/Code.java
index eb74e42..113c4c3 100644
--- a/src/main/java/com/example/nto/entity/Code.java
+++ b/src/main/java/com/example/nto/entity/Code.java
@@ -13,7 +13,7 @@ public class Code {
     private Long id;
 
     @Column(name="value")
-    private Long value;
+    private String value;
 
     @Column(name ="name")
     private String name;
diff --git a/src/main/java/com/example/nto/repository/CodeRepository.java b/src/main/java/com/example/nto/repository/CodeRepository.java
index 22d1219..083e084 100644
--- a/src/main/java/com/example/nto/repository/CodeRepository.java
+++ b/src/main/java/com/example/nto/repository/CodeRepository.java
@@ -7,5 +7,5 @@ import org.springframework.data.jpa.repository.Query;
 import java.util.Optional;
 
 public interface CodeRepository extends JpaRepository<Code, Long> {
-    Optional<Code> findByValue(long value);
+    Optional<Code> findByValue(String value);
 }
diff --git a/src/main/java/com/example/nto/service/EmployeeService.java b/src/main/java/com/example/nto/service/EmployeeService.java
index 2bcbd35..93bdbfc 100644
--- a/src/main/java/com/example/nto/service/EmployeeService.java
+++ b/src/main/java/com/example/nto/service/EmployeeService.java
@@ -9,5 +9,5 @@ public interface EmployeeService {
     EmployeeDto getByLogin(String login);
     String blockEmployee(String login);
     String unblockEmployee(String login);
-    Boolean enterEmployee(String login, Long value);
+    Boolean enterEmployee(String login, String value);
 }
\ No newline at end of file
diff --git a/src/main/java/com/example/nto/service/impl/EmployeeServiceImpl.java b/src/main/java/com/example/nto/service/impl/EmployeeServiceImpl.java
index 3cb4662..39852ab 100644
--- a/src/main/java/com/example/nto/service/impl/EmployeeServiceImpl.java
+++ b/src/main/java/com/example/nto/service/impl/EmployeeServiceImpl.java
@@ -61,7 +61,7 @@ public class EmployeeServiceImpl implements EmployeeService {
     }
 
     @Override
-    public Boolean enterEmployee(String login, Long value) {
+    public Boolean enterEmployee(String login, String value) {
         Employee employee = EmployeeMapper.convertFromDto(getByLogin(login));
         if (employee != null) {
             Optional<Code> codeOp = codeRepository.findByValue(value);
diff --git a/src/main/resources/db.changelog/1.0/2025-01-30--0001-code.xml b/src/main/resources/db.changelog/1.0/2025-01-30--0001-code.xml
index b58a5dd..1148be3 100644
--- a/src/main/resources/db.changelog/1.0/2025-01-30--0001-code.xml
+++ b/src/main/resources/db.changelog/1.0/2025-01-30--0001-code.xml
@@ -18,7 +18,7 @@
             <column name="name" type="VARCHAR">
                 <constraints nullable="false" unique="true"/>
             </column>
-            <column name="value" type="Long">
+            <column name="value" type="VARCHAR">
                 <constraints nullable="false"/>
             </column>
         </createTable>