diff --git a/testkit-backend/src/main/java/neo4j/org/testkit/backend/messages/requests/GetFeatures.java b/testkit-backend/src/main/java/neo4j/org/testkit/backend/messages/requests/GetFeatures.java
index 23701341d3..36f640e4e0 100644
--- a/testkit-backend/src/main/java/neo4j/org/testkit/backend/messages/requests/GetFeatures.java
+++ b/testkit-backend/src/main/java/neo4j/org/testkit/backend/messages/requests/GetFeatures.java
@@ -65,7 +65,8 @@ public class GetFeatures implements TestkitRequest
             "Optimization:EagerTransactionBegin",
             "Feature:API:Driver.IsEncrypted",
             "Feature:API:SSLConfig",
-            "Detail:DefaultSecurityConfigValueEquality"
+            "Detail:DefaultSecurityConfigValueEquality",
+            "Optimization:ImplicitDefaultArguments"
     ) );
 
     private static final Set<String> SYNC_FEATURES = new HashSet<>( Arrays.asList(
diff --git a/testkit-backend/src/main/java/neo4j/org/testkit/backend/messages/requests/StartTest.java b/testkit-backend/src/main/java/neo4j/org/testkit/backend/messages/requests/StartTest.java
index 384a30af41..e4823ec35d 100644
--- a/testkit-backend/src/main/java/neo4j/org/testkit/backend/messages/requests/StartTest.java
+++ b/testkit-backend/src/main/java/neo4j/org/testkit/backend/messages/requests/StartTest.java
@@ -55,6 +55,12 @@ public class StartTest implements TestkitRequest
         String skipMessage = "This test expects hostname verification to be turned off when all certificates are trusted";
         COMMON_SKIP_PATTERN_TO_REASON.put( "^.*\\.TestTrustAllCertsConfig\\.test_trusted_ca_wrong_hostname$", skipMessage );
         COMMON_SKIP_PATTERN_TO_REASON.put( "^.*\\.TestTrustAllCertsConfig\\.test_untrusted_ca_wrong_hostname$", skipMessage );
+        skipMessage = "This test needs updating to implement expected behaviour";
+        COMMON_SKIP_PATTERN_TO_REASON.put( "^.*\\.TestAuthenticationSchemes\\.test_custom_scheme_empty$", skipMessage );
+        skipMessage = "Driver does not implement optimization for qid in explicit transaction";
+        COMMON_SKIP_PATTERN_TO_REASON.put( "^.*\\.TestOptimizations\\.test_uses_implicit_default_arguments$", skipMessage );
+        COMMON_SKIP_PATTERN_TO_REASON.put( "^.*\\.TestOptimizations\\.test_uses_implicit_default_arguments_multi_query$", skipMessage );
+        COMMON_SKIP_PATTERN_TO_REASON.put( "^.*\\.TestOptimizations\\.test_uses_implicit_default_arguments_multi_query_nested$", skipMessage );
 
         ASYNC_SKIP_PATTERN_TO_REASON.putAll( COMMON_SKIP_PATTERN_TO_REASON );
         ASYNC_SKIP_PATTERN_TO_REASON.put( "^.*\\.test_should_reject_server_using_verify_connectivity_bolt_3x0$", "Does not error as expected" );