diff --git a/buisnesslogic/src/main/java/com/plannaplan/configutils/FileToDatabaseMigrator.java b/buisnesslogic/src/main/java/com/plannaplan/configutils/FileToDatabaseMigrator.java
index 0f9f033..44af1f6 100755
--- a/buisnesslogic/src/main/java/com/plannaplan/configutils/FileToDatabaseMigrator.java
+++ b/buisnesslogic/src/main/java/com/plannaplan/configutils/FileToDatabaseMigrator.java
@@ -92,8 +92,12 @@ public class FileToDatabaseMigrator {
                     .orElseGet(() -> this.lecturerService
                             .save(new Lecturer(lecturerTitle, lecturerName, lecturerSurname)));
 
-            this.groupService.find(zajCykId, grNr).orElseGet(
-                    () -> this.groupService.save(new Groups(capacity, room, course, time, groupDay, lecturer, zajCykId, grNr)));
+            Groups group = this.groupService.find(zajCykId, grNr).orElseGet(
+                    () -> new Groups(capacity, room, course, time, groupDay, lecturer, zajCykId, grNr));
+
+                group.update(capacity, room, course, time, null, groupDay, lecturer);
+                
+                this.groupService.save(group);
 
         }
 
diff --git a/buisnesslogic/src/main/java/com/plannaplan/entities/Groups.java b/buisnesslogic/src/main/java/com/plannaplan/entities/Groups.java
index c6bbf4e..e26ce6a 100755
--- a/buisnesslogic/src/main/java/com/plannaplan/entities/Groups.java
+++ b/buisnesslogic/src/main/java/com/plannaplan/entities/Groups.java
@@ -130,6 +130,47 @@ public class Groups {
         this(capacity, room, course, time, time + DEFAULT_CLASS_TIME, day, lecturer);
     }
 
+    /**
+     * Updates given values other that are not null
+     * 
+     * @param capacity capacity given to the groups
+     * @param room     room given to the groups
+     * @param course   course given to the groups
+     * @param time     time given to the groups
+     * @param endTime  end time of class in minutes
+     * @param day      day given to the groups
+     * @param lecturer lecturer given to the groups
+     */
+    public void update(Integer capacity, String room, Course course, Integer time, Integer endTime, WeekDay day, Lecturer lecturer){
+        if (capacity != null){
+            this.capacity = capacity;
+        } 
+
+        if (room != null){
+            this.room = room;
+        } 
+    
+        if (course != null){
+            this.course = course;
+        } 
+
+        if (time != null){
+            this.time = time;
+        } 
+
+        if (endTime != null){
+            this.endTime = endTime;
+        } 
+
+        if (day != null){
+            this.day = day;
+        } 
+
+        if (lecturer != null){
+            this.lecturer = lecturer;
+        } 
+    }
+
     /**
      * get time of class end
      * 
diff --git a/buisnesslogic/src/test/java/com/plannaplan/services/ConfiguratorServiceTest.java b/buisnesslogic/src/test/java/com/plannaplan/services/ConfiguratorServiceTest.java
index 0190b2c..d69754d 100755
--- a/buisnesslogic/src/test/java/com/plannaplan/services/ConfiguratorServiceTest.java
+++ b/buisnesslogic/src/test/java/com/plannaplan/services/ConfiguratorServiceTest.java
@@ -2,6 +2,8 @@ package com.plannaplan.services;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.annotation.DirtiesContext;
+import org.springframework.test.annotation.DirtiesContext.MethodMode;
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.junit4.SpringRunner;
 
@@ -9,9 +11,11 @@ import static org.junit.Assert.assertTrue;
 
 import java.io.InputStream;
 import java.sql.Date;
+import java.util.Optional;
 
 import com.plannaplan.TestApplication;
 import com.plannaplan.entities.AppConfig;
+import com.plannaplan.entities.Groups;
 import com.plannaplan.models.ConfigData;
 import com.plannaplan.models.TourData;
 import com.plannaplan.repositories.AppConfigRepository;
@@ -24,6 +28,9 @@ import org.junit.runner.RunWith;
 @ContextConfiguration
 public class ConfiguratorServiceTest {
 
+    private final static String BEFORE_UPDATE_FILE = "ZajeciaBeforeUpdate.xlsx";
+    private final static String AFTER_UPDATE_FILE = "ZajeciaAfterUpdate.xlsx";
+
     @Autowired
     private ConfiguratorService configuratorService;
 
@@ -57,6 +64,31 @@ public class ConfiguratorServiceTest {
         assertTrue(courses_ammount > 0 && groups_ammount > 0 && lecturers_ammount > 0);
     }
 
+    @Test
+    @DirtiesContext(methodMode = MethodMode.BEFORE_METHOD)
+    public void shouldUpdatePreviousImport(){
+        final InputStream inputStream = getClass().getClassLoader()
+        .getResourceAsStream(ConfiguratorServiceTest.BEFORE_UPDATE_FILE);
+        this.configuratorService.importCoursesStream(inputStream);
+        int groups_ammount = this.groupService.getGroupsAmmount();
+        
+        assertTrue(groups_ammount == 2);
+
+        final InputStream inputStream2 = getClass().getClassLoader()
+        .getResourceAsStream(ConfiguratorServiceTest.AFTER_UPDATE_FILE);
+        this.configuratorService.importCoursesStream(inputStream2);
+        int groups_ammount2 = this.groupService.getGroupsAmmount();
+
+        Optional<Groups> newGroup = this.groupService.find(456458, 3); 
+        Optional<Groups> updateGroup = this.groupService.find(456457, 2);
+
+        assertTrue(groups_ammount2 == 3);
+        assertTrue(newGroup.isPresent());
+        assertTrue(updateGroup.get().getLecturer().getSurname().equals("Murawski"));
+        assertTrue(updateGroup.get().getLecturer().getName().equals("Roman"));
+        assertTrue(updateGroup.get().getLecturer().getTitle().equals("prof. dr hab."));
+    }
+
     @Test
     public void shouldRetrunNewestConfig() throws InterruptedException {
         final Date dateToCheck = new Date(System.currentTimeMillis());
diff --git a/buisnesslogic/src/test/resources/ZajeciaAfterUpdate.xlsx b/buisnesslogic/src/test/resources/ZajeciaAfterUpdate.xlsx
new file mode 100644
index 0000000..bb3d360
Binary files /dev/null and b/buisnesslogic/src/test/resources/ZajeciaAfterUpdate.xlsx differ
diff --git a/buisnesslogic/src/test/resources/ZajeciaBeforeUpdate.xlsx b/buisnesslogic/src/test/resources/ZajeciaBeforeUpdate.xlsx
new file mode 100644
index 0000000..15b7367
Binary files /dev/null and b/buisnesslogic/src/test/resources/ZajeciaBeforeUpdate.xlsx differ