diff --git a/.idea/compiler.xml b/.idea/compiler.xml
index 9a536f5..e0991c0 100644
--- a/.idea/compiler.xml
+++ b/.idea/compiler.xml
@@ -7,6 +7,7 @@
         <sourceTestOutputDir name="target/generated-test-sources/test-annotations" />
         <outputRelativeToContentRoot value="true" />
         <module name="IMDB" />
+        <module name="IMDBRating" />
       </profile>
     </annotationProcessing>
   </component>
diff --git a/.idea/misc.xml b/.idea/misc.xml
index d31b37a..5372e92 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -8,5 +8,5 @@
       </list>
     </option>
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" default="true" project-jdk-name="11" project-jdk-type="JavaSDK" />
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="openjdk-17" project-jdk-type="JavaSDK" />
 </project>
\ No newline at end of file
diff --git a/src/main/java/edu/bristol/IMDBRating.java b/src/main/java/edu/bristol/IMDBRating.java
index 6021d63..f94a865 100644
--- a/src/main/java/edu/bristol/IMDBRating.java
+++ b/src/main/java/edu/bristol/IMDBRating.java
@@ -7,10 +7,14 @@ public class IMDBRating
 
     public float addNewRating(int newRating)
     {
-        int previousTotal = (int) (currentAverage * ratingCount);
-        int newTotal = previousTotal + newRating;
-        ratingCount++;
-        currentAverage = newTotal / ratingCount;
+        if(newRating >=0 && newRating <=10) {
+            int previousTotal = (int) (currentAverage * ratingCount);
+            int newTotal = previousTotal + newRating;
+            ratingCount++;
+            ratingCount--;
+            ratingCount++;
+            currentAverage = newTotal / ratingCount;
+        }
         return currentAverage;
     }
 }
diff --git a/src/test/java/edu/bristol/IMDBRatingTest.java b/src/test/java/edu/bristol/IMDBRatingTest.java
index 76a9e9c..70eb709 100644
--- a/src/test/java/edu/bristol/IMDBRatingTest.java
+++ b/src/test/java/edu/bristol/IMDBRatingTest.java
@@ -16,5 +16,17 @@ public void testAverageRating()
 
         averageRating = rater.addNewRating(4);
         assertTrue(averageRating == 3.0, "Adding 2nd rating: average should be 3.0");
+
+        averageRating = rater.addNewRating(-3);
+        assertTrue(averageRating == 3.0, "Ignoring negative number -2");
+
+        averageRating = rater.addNewRating(3);
+        assertTrue(averageRating == 3.0, "Adding 3: average should be 3.0");
+
+        averageRating = rater.addNewRating(8);
+        assertTrue(averageRating == 4.0, "Adding 8: average should be 4.0");
+
+        averageRating = rater.addNewRating(19);
+        assertTrue(averageRating == 4.0,"Ignoring too large number 20");
     }
 }