diff --git a/prj.conf b/prj.conf
index 13460d9413d33575bb2e954e812a72f9ca1c12d7..ec392ac942f1ceb986820d7063e0203e7f97c868 100644
--- a/prj.conf
+++ b/prj.conf
@@ -85,5 +85,7 @@ CONFIG_OPENTHREAD_JOINER_AUTOSTART=y
 CONFIG_OPENTHREAD_JOINER_PSKD="J01NU5"
 CONFIG_OPENTHREAD_SLAAC=y
 
+CONFIG_OPENTHREAD_THREAD_VERSION_1_2=y
+
 # Enable diagnostic module, uncomment if needed
 #CONFIG_OPENTHREAD_DIAG=y