diff --git a/webapi/src/main/scala/org/knora/webapi/responders/admin/ProjectsResponderADM.scala b/webapi/src/main/scala/org/knora/webapi/responders/admin/ProjectsResponderADM.scala
index 42c3bc0a77..a872850c97 100644
--- a/webapi/src/main/scala/org/knora/webapi/responders/admin/ProjectsResponderADM.scala
+++ b/webapi/src/main/scala/org/knora/webapi/responders/admin/ProjectsResponderADM.scala
@@ -25,6 +25,7 @@ import org.knora.webapi.messages.admin.responder.usersmessages.{
 }
 import org.knora.webapi.messages.admin.responder.permissionsmessages._
 import org.knora.webapi.messages.store.cacheservicemessages.{
+  CacheServiceFlushDB,
   CacheServiceGetProjectADM,
   CacheServicePutProjectADM,
   CacheServiceRemoveValues
@@ -879,7 +880,8 @@ class ProjectsResponderADM(responderData: ResponderData) extends Responder(respo
         throw NotFoundException(s"Project '$projectIri' not found. Aborting update request.")
       }
       // we are changing the project, so lets get rid of the cached copy
-      _ = invalidateCachedProjectADM(maybeCurrentProject)
+      // invalidateCachedProjectADM isn't clearing cache as expected
+      _ = storeManager ? CacheServiceFlushDB(KnoraSystemInstances.Users.SystemUser)
 
       /* Update project */
       updateProjectSparqlString <- Future(
diff --git a/webapi/src/main/scala/org/knora/webapi/routing/admin/ProjectsRouteADM.scala b/webapi/src/main/scala/org/knora/webapi/routing/admin/ProjectsRouteADM.scala
index ced29ed2e8..497f27bdc5 100644
--- a/webapi/src/main/scala/org/knora/webapi/routing/admin/ProjectsRouteADM.scala
+++ b/webapi/src/main/scala/org/knora/webapi/routing/admin/ProjectsRouteADM.scala
@@ -30,6 +30,7 @@ import org.knora.webapi.messages.admin.responder.valueObjects.{
   Shortname,
   Status
 }
+import org.knora.webapi.messages.store.cacheservicemessages.CacheServiceFlushDB
 import org.knora.webapi.routing.{Authenticator, KnoraRoute, KnoraRouteData, RouteUtilADM}
 import zio.prelude.Validation