diff --git a/base/src/main/java/de/staropensource/sosengine/base/types/DependencyVector.java b/base/src/main/java/de/staropensource/sosengine/base/types/DependencyVector.java
index 42f41b3..dda385d 100644
--- a/base/src/main/java/de/staropensource/sosengine/base/types/DependencyVector.java
+++ b/base/src/main/java/de/staropensource/sosengine/base/types/DependencyVector.java
@@ -46,7 +46,7 @@ public class DependencyVector {
      * @since v1-alpha1
      */
     @NotNull
-    private final String identifier;
+    protected String identifier;
 
     /**
      * Determines which versioning system this vector uses.
@@ -60,7 +60,7 @@ public class DependencyVector {
      * @since v1-alpha1
      */
     @NotNull
-    private final Class<? extends VersioningSystem> versioningSystem;
+    protected Class<? extends VersioningSystem> versioningSystem;
 
     /**
      * Contains the version of this vector.
@@ -74,7 +74,7 @@ public class DependencyVector {
      * @since v1-alpha1
      */
     @NotNull
-    private final String version;
+    protected String version;
 
     /**
      * Contains all vectors this vector hard-depends on.
@@ -88,7 +88,7 @@ public class DependencyVector {
      * @since v1-alpha1
      */
     @NotNull
-    private final List<@NotNull String> dependencies;
+    protected List<@NotNull String> dependencies;
 
     /**
      * Creates a new dependency vector.