diff --git a/fantemp/terminal.hpp b/fantemp/terminal.hpp
index e60bedd..0e9198d 100644
--- a/fantemp/terminal.hpp
+++ b/fantemp/terminal.hpp
@@ -19,8 +19,10 @@ GF(SHOW_CMD, "show");
 GF(CURVE_CMD, "curve");
 GF(MONITOR_CMD, "monitor");
 GF(BOOTLOADER_CMD, "bootloader");
+GF(UPTIME_CMD, "uptime");
+
 GF(VERSION_CMD, "version");
-GF(VERSION, "1.2");
+GF(VERSION, "1.3");
 
 static inline bool substringEquals(const char *str, const ::detail::FlashString *flashStr, const size_t &size)
 {
@@ -137,6 +139,8 @@ class Terminal {
 					m_state = State::MONITOR;
 				} else if (substringEquals(m_inputBuffer, detail::BOOTLOADER_CMD, m_inputSize)) {
 					handleBootloader();
+				} else if (substringEquals(m_inputBuffer, detail::UPTIME_CMD, m_inputSize)) {
+					printUptime();
 				} else if (substringEquals(m_inputBuffer, detail::VERSION_CMD, m_inputSize)) {
 					printVersion();
 				} else {
@@ -164,6 +168,7 @@ class Terminal {
 		m_serial << detail::CURVE_CMD << F(" ......: shows mapping from temperature to fan speed") << detail::ENDL;
 		m_serial << detail::MONITOR_CMD << F(" ....: loops the show command until Ctrl + C is pressed") << detail::ENDL;
 		m_serial << detail::BOOTLOADER_CMD << F(" .: enters the bootloader after 3 seconds") << detail::ENDL;
+		m_serial << detail::UPTIME_CMD << F(" .....: show system uptime") << detail::ENDL;
 		m_serial << detail::VERSION_CMD << F(" ....: displays firmware version") << detail::ENDL;
 	}
 
@@ -203,6 +208,25 @@ class Terminal {
 		Bootloader::enter();
 	}
 
+	static void printUptime()
+	{
+		constexpr auto delimiter = ':';
+
+		const auto uptime = clk::millis();
+
+		const auto hours = static_cast<uint16_t>(uptime / 1000 / 60 / 60);
+		const auto minutes = static_cast<uint8_t>((uptime / 1000 / 60) % 60);
+		const auto seconds = static_cast<uint8_t>((uptime / 1000) % 60);
+
+		m_serial << F("System uptime: ");
+		m_serial.template txNumber<uint16_t, 10, 2>(hours);
+		m_serial << delimiter;
+		m_serial.template txNumber<uint8_t, 10, 2>(minutes);
+		m_serial << delimiter;
+		m_serial.template txNumber<uint8_t, 10, 2>(seconds);
+		m_serial << detail::ENDL;
+	}
+
 	static void printVersion()
 	{
 		m_serial << F("FanTemp v") << detail::VERSION << detail::ENDL;
diff --git a/fantemp/uart b/fantemp/uart
index cb436b1..6f592dd 160000
--- a/fantemp/uart
+++ b/fantemp/uart
@@ -1 +1 @@
-Subproject commit cb436b11a8428c2c40a11b51fedb4d2c7d38ece7
+Subproject commit 6f592dd0987cae4f7f826056e5ff358ad26d3127