diff --git a/runtime-metamodel/src/main/java/org/eclipse/edc/runtime/metamodel/annotation/BaseExtension.java b/runtime-metamodel/src/main/java/org/eclipse/edc/runtime/metamodel/annotation/BaseExtension.java
index 92e8086..f45fdbf 100644
--- a/runtime-metamodel/src/main/java/org/eclipse/edc/runtime/metamodel/annotation/BaseExtension.java
+++ b/runtime-metamodel/src/main/java/org/eclipse/edc/runtime/metamodel/annotation/BaseExtension.java
@@ -22,9 +22,12 @@
 
 /**
  * Indicates that an extension belongs to the runtime core and should always be loaded first.
+ *
+ * @deprecated this annotation is not used anymore and can be removed
  */
 @Retention(RetentionPolicy.RUNTIME)
 @Target(ElementType.TYPE)
 @Documented
+@Deprecated(since = "0.11.0")
 public @interface BaseExtension {
 }
diff --git a/runtime-metamodel/src/main/java/org/eclipse/edc/runtime/metamodel/annotation/CoreExtension.java b/runtime-metamodel/src/main/java/org/eclipse/edc/runtime/metamodel/annotation/CoreExtension.java
index 7e29fe4..3eb9e37 100644
--- a/runtime-metamodel/src/main/java/org/eclipse/edc/runtime/metamodel/annotation/CoreExtension.java
+++ b/runtime-metamodel/src/main/java/org/eclipse/edc/runtime/metamodel/annotation/CoreExtension.java
@@ -23,10 +23,13 @@
 /**
  * Indicates that an extension pertains to the core:transfer module, which will cause it to receive special treatment
  * upon extension loading.
+ *
+ * @deprecated this annotation is not used anymore and can be removed
  */
 @Retention(RetentionPolicy.RUNTIME)
 @Target(ElementType.TYPE)
 @Documented
+@Deprecated(since = "0.11.0")
 public @interface CoreExtension {
 
 }