diff --git a/examples/openthread/ot_sleepy_device/sdkconfig.defaults b/examples/openthread/ot_sleepy_device/sdkconfig.defaults
index 5f64593d30..e9d3993e19 100644
--- a/examples/openthread/ot_sleepy_device/sdkconfig.defaults
+++ b/examples/openthread/ot_sleepy_device/sdkconfig.defaults
@@ -1,5 +1,3 @@
-CONFIG_FREERTOS_IDLE_TASK_STACKSIZE=2048
-
 #
 # Partition Table
 #
@@ -11,10 +9,6 @@ CONFIG_PARTITION_TABLE_FILENAME="partitions.csv"
 #
 # mbedTLS
 #
-# ESP32H2-TODO: JIRA TZ-127, enable HW acceleration.
-CONFIG_MBEDTLS_HARDWARE_AES=n
-CONFIG_MBEDTLS_HARDWARE_MPI=n
-CONFIG_MBEDTLS_HARDWARE_SHA=n
 CONFIG_MBEDTLS_CMAC_C=y
 CONFIG_MBEDTLS_SSL_PROTO_DTLS=y
 CONFIG_MBEDTLS_KEY_EXCHANGE_ECJPAKE=y