diff --git a/build.gradle b/build.gradle
index fea77f9..1ac7fc2 100644
--- a/build.gradle
+++ b/build.gradle
@@ -29,7 +29,7 @@ repositories {
 dependencies {
     implementation 'com.beust:jcommander:1.82'
     implementation 'commons-io:commons-io:2.21.0'
-    testImplementation 'org.mockito:mockito-core:5.20.0'
+    testImplementation 'org.mockito:mockito-core:5.21.0'
     testImplementation 'junit:junit:4.13.2'
 }
 
diff --git a/src/test/java/ca/craigthomas/chip8java/emulator/components/CentralProcessingUnitTest.java b/src/test/java/ca/craigthomas/chip8java/emulator/components/CentralProcessingUnitTest.java
index 1bd6caa..d286418 100644
--- a/src/test/java/ca/craigthomas/chip8java/emulator/components/CentralProcessingUnitTest.java
+++ b/src/test/java/ca/craigthomas/chip8java/emulator/components/CentralProcessingUnitTest.java
@@ -586,15 +586,13 @@ public void testMoveDelayTimerIntoRegister() {
 
     @Test
     public void testMoveRegisterIntoDelayRegister() {
-        for (int register = 0; register < 0xF; register++) {
-            for (int value = 0; value < 0xFF; value += 10) {
-                cpu.v[register] = (short) value;
-                cpu.operand = register << 8;
-                cpu.delay = 0;
-                cpu.moveRegisterIntoDelayRegister();
-                assertEquals(value, cpu.delay);
-            }
-        }
+        int register = 8;
+        short value = 10;
+        cpu.v[register] = value;
+        cpu.operand = register << 8;
+        cpu.delay = 0;
+        cpu.moveRegisterIntoDelayRegister();
+        assertEquals(value, cpu.delay);
     }
 
     @Test