diff --git a/CMakeLists.txt b/CMakeLists.txt
index 28b1a08..ca1e89f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,7 +6,7 @@ cmake_minimum_required(VERSION 3.12)
 project(EDM4EIC
   LANGUAGES CXX)
 
-SET( ${PROJECT_NAME}_VERSION_MAJOR 5 )
+SET( ${PROJECT_NAME}_VERSION_MAJOR 6 )
 SET( ${PROJECT_NAME}_VERSION_MINOR 0 )
 SET( ${PROJECT_NAME}_VERSION_PATCH 0 )
 SET( ${PROJECT_NAME}_VERSION  "${${PROJECT_NAME}_VERSION_MAJOR}.${${PROJECT_NAME}_VERSION_MINOR}.${${PROJECT_NAME}_VERSION_PATCH}" )
diff --git a/edm4eic.yaml b/edm4eic.yaml
index a3e7bb1..dd2b474 100644
--- a/edm4eic.yaml
+++ b/edm4eic.yaml
@@ -546,5 +546,4 @@ datatypes:
       - float                 weight        // weight of this association
     OneToOneRelations:
      - edm4eic::RawTrackerHit rawHit        // reference to the digitized hit
-    OneToManyRelations:
-     - edm4hep::SimTrackerHit simHits       // reference to the simulated hits
+     - edm4hep::SimTrackerHit simHit       // reference to the simulated hit