diff --git a/test/simulation/105-ntpauth b/test/simulation/105-ntpauth
index 9ec4fba..46b2660 100755
--- a/test/simulation/105-ntpauth
+++ b/test/simulation/105-ntpauth
@@ -70,13 +70,18 @@ clients=2
 peers=2
 max_sync_time=500
 base_delay="$default_base_delay (* -1 (equal 0.1 from 3) (equal 0.1 to 1))"
+
+for versions in "3 3" "3 4" "4 3" "4 4"; do
+	for key in 1 $keys; do
+		client_lpeer_options="version ${versions% *} key $key"
+		client_rpeer_options="version ${versions#* } key $key"
+		run_test || test_fail
+		check_chronyd_exit || test_fail
+		check_sync || test_fail
+	done
+done
+
 client_lpeer_options="key 1"
-client_rpeer_options="key 1"
-
-run_test || test_fail
-check_chronyd_exit || test_fail
-check_sync || test_fail
-
 client_rpeer_options="key 2"
 
 run_test || test_fail