diff --git a/drivers/firmware/scmi/sandbox-scmi_agent.c b/drivers/firmware/scmi/sandbox-scmi_agent.c
index ab8afb01de40..a99fcb0ad4a9 100644
--- a/drivers/firmware/scmi/sandbox-scmi_agent.c
+++ b/drivers/firmware/scmi/sandbox-scmi_agent.c
@@ -43,6 +43,10 @@
 #define SANDBOX_SCMI_AGENT_NAME "OSPM"
 #define SANDBOX_SCMI_PLATFORM_NAME "platform"
 
+#define SANDBOX_SCMI_CLOCK_PROTOCOL_VERSION SCMI_CLOCK_PROTOCOL_VERSION
+#define SANDBOX_SCMI_RD_PROTOCOL_VERSION SCMI_RESETDOM_PROTOCOL_VERSION
+#define SANDBOX_SCMI_VOLTD_PROTOCOL_VERSION SCMI_VOLTDOM_PROTOCOL_VERSION
+
 static u8 protocols[] = {
 	SCMI_PROTOCOL_ID_CLOCK,
 	SCMI_PROTOCOL_ID_RESET_DOMAIN,
@@ -440,6 +444,28 @@ static int sandbox_scmi_base_reset_agent_configuration(struct udevice *dev,
 
 /* Clock Protocol */
 
+/**
+ * sandbox_scmi_clock_protocol_version - implement SCMI_PROTOCOL_VERSION
+ * @udevice:	SCMI device
+ * @msg:	SCMI message
+ *
+ * Implement SCMI_PROTOCOL_VERSION command.
+ */
+static int sandbox_scmi_clock_protocol_version(struct udevice *dev,
+					       struct scmi_msg *msg)
+{
+	struct scmi_protocol_version_out *out = NULL;
+
+	if (!msg->out_msg || msg->out_msg_sz < sizeof(*out))
+		return -EINVAL;
+
+	out = (struct scmi_protocol_version_out *)msg->out_msg;
+	out->version = SANDBOX_SCMI_CLOCK_PROTOCOL_VERSION;
+	out->status = SCMI_SUCCESS;
+
+	return 0;
+}
+
 static int sandbox_scmi_clock_protocol_attribs(struct udevice *dev,
 					       struct scmi_msg *msg)
 {
@@ -577,6 +603,30 @@ static int sandbox_scmi_clock_gate(struct udevice *dev, struct scmi_msg *msg)
 	return 0;
 }
 
+/* Reset Domain Protocol */
+
+/**
+ * sandbox_scmi_rd_protocol_version - implement SCMI_PROTOCOL_VERSION
+ * @udevice:	SCMI device
+ * @msg:	SCMI message
+ *
+ * Implement SCMI_PROTOCOL_VERSION command.
+ */
+static int sandbox_scmi_rd_protocol_version(struct udevice *dev,
+					    struct scmi_msg *msg)
+{
+	struct scmi_protocol_version_out *out = NULL;
+
+	if (!msg->out_msg || msg->out_msg_sz < sizeof(*out))
+		return -EINVAL;
+
+	out = (struct scmi_protocol_version_out *)msg->out_msg;
+	out->version = SANDBOX_SCMI_RD_PROTOCOL_VERSION;
+	out->status = SCMI_SUCCESS;
+
+	return 0;
+}
+
 static int sandbox_scmi_rd_attribs(struct udevice *dev, struct scmi_msg *msg)
 {
 	struct scmi_rd_attr_in *in = NULL;
@@ -647,6 +697,30 @@ static int sandbox_scmi_rd_reset(struct udevice *dev, struct scmi_msg *msg)
 	return 0;
 }
 
+/* Voltage Domain Protocol */
+
+/**
+ * sandbox_scmi_voltd_protocol_version - implement SCMI_PROTOCOL_VERSION
+ * @udevice:	SCMI device
+ * @msg:	SCMI message
+ *
+ * Implement SCMI_PROTOCOL_VERSION command.
+ */
+static int sandbox_scmi_voltd_protocol_version(struct udevice *dev,
+					       struct scmi_msg *msg)
+{
+	struct scmi_protocol_version_out *out = NULL;
+
+	if (!msg->out_msg || msg->out_msg_sz < sizeof(*out))
+		return -EINVAL;
+
+	out = (struct scmi_protocol_version_out *)msg->out_msg;
+	out->version = SANDBOX_SCMI_VOLTD_PROTOCOL_VERSION;
+	out->status = SCMI_SUCCESS;
+
+	return 0;
+}
+
 static int sandbox_scmi_voltd_attribs(struct udevice *dev, struct scmi_msg *msg)
 {
 	struct scmi_voltd_attr_in *in = NULL;
@@ -833,6 +907,8 @@ static int sandbox_scmi_test_process_msg(struct udevice *dev,
 		break;
 	case SCMI_PROTOCOL_ID_CLOCK:
 		switch (msg->message_id) {
+		case SCMI_PROTOCOL_VERSION:
+			return sandbox_scmi_clock_protocol_version(dev, msg);
 		case SCMI_PROTOCOL_ATTRIBUTES:
 			return sandbox_scmi_clock_protocol_attribs(dev, msg);
 		case SCMI_CLOCK_ATTRIBUTES:
@@ -849,6 +925,8 @@ static int sandbox_scmi_test_process_msg(struct udevice *dev,
 		break;
 	case SCMI_PROTOCOL_ID_RESET_DOMAIN:
 		switch (msg->message_id) {
+		case SCMI_PROTOCOL_VERSION:
+			return sandbox_scmi_rd_protocol_version(dev, msg);
 		case SCMI_RESET_DOMAIN_ATTRIBUTES:
 			return sandbox_scmi_rd_attribs(dev, msg);
 		case SCMI_RESET_DOMAIN_RESET:
@@ -859,6 +937,8 @@ static int sandbox_scmi_test_process_msg(struct udevice *dev,
 		break;
 	case SCMI_PROTOCOL_ID_VOLTAGE_DOMAIN:
 		switch (msg->message_id) {
+		case SCMI_PROTOCOL_VERSION:
+			return sandbox_scmi_voltd_protocol_version(dev, msg);
 		case SCMI_VOLTAGE_DOMAIN_ATTRIBUTES:
 			return sandbox_scmi_voltd_attribs(dev, msg);
 		case SCMI_VOLTAGE_DOMAIN_CONFIG_SET:
