diff --git a/src/main/java/inf112/fiasko/roborally/utility/IOUtil.java b/src/main/java/inf112/fiasko/roborally/utility/IOUtil.java
index 54a7641..75d8bba 100644
--- a/src/main/java/inf112/fiasko/roborally/utility/IOUtil.java
+++ b/src/main/java/inf112/fiasko/roborally/utility/IOUtil.java
@@ -13,7 +13,7 @@ import inf112.fiasko.roborally.objects.Wall;
 import java.util.ArrayList;
 import java.util.List;
 
-public class IOUtil {
+public final class IOUtil {
     private IOUtil() {}
 
     /**
diff --git a/src/main/java/inf112/fiasko/roborally/utility/ResourceUtil.java b/src/main/java/inf112/fiasko/roborally/utility/ResourceUtil.java
index 4ae246a..b4b6148 100644
--- a/src/main/java/inf112/fiasko/roborally/utility/ResourceUtil.java
+++ b/src/main/java/inf112/fiasko/roborally/utility/ResourceUtil.java
@@ -2,7 +2,7 @@ package inf112.fiasko.roborally.utility;
 
 import java.io.InputStream;
 
-public class ResourceUtil {
+public final class ResourceUtil {
     private ResourceUtil() {}
 
     /**