diff --git a/lib/TasmotaSerial-2.3.0/README.md b/lib/TasmotaSerial-2.3.1/README.md
similarity index 100%
rename from lib/TasmotaSerial-2.3.0/README.md
rename to lib/TasmotaSerial-2.3.1/README.md
diff --git a/lib/TasmotaSerial-2.3.0/examples/swsertest/swsertest.ino b/lib/TasmotaSerial-2.3.1/examples/swsertest/swsertest.ino
similarity index 100%
rename from lib/TasmotaSerial-2.3.0/examples/swsertest/swsertest.ino
rename to lib/TasmotaSerial-2.3.1/examples/swsertest/swsertest.ino
diff --git a/lib/TasmotaSerial-2.3.0/keywords.txt b/lib/TasmotaSerial-2.3.1/keywords.txt
similarity index 100%
rename from lib/TasmotaSerial-2.3.0/keywords.txt
rename to lib/TasmotaSerial-2.3.1/keywords.txt
diff --git a/lib/TasmotaSerial-2.3.0/library.json b/lib/TasmotaSerial-2.3.1/library.json
similarity index 100%
rename from lib/TasmotaSerial-2.3.0/library.json
rename to lib/TasmotaSerial-2.3.1/library.json
diff --git a/lib/TasmotaSerial-2.3.0/library.properties b/lib/TasmotaSerial-2.3.1/library.properties
similarity index 100%
rename from lib/TasmotaSerial-2.3.0/library.properties
rename to lib/TasmotaSerial-2.3.1/library.properties
diff --git a/lib/TasmotaSerial-2.3.0/src/TasmotaSerial.cpp b/lib/TasmotaSerial-2.3.1/src/TasmotaSerial.cpp
similarity index 97%
rename from lib/TasmotaSerial-2.3.0/src/TasmotaSerial.cpp
rename to lib/TasmotaSerial-2.3.1/src/TasmotaSerial.cpp
index eecdeb124..d99137edc 100644
--- a/lib/TasmotaSerial-2.3.0/src/TasmotaSerial.cpp
+++ b/lib/TasmotaSerial-2.3.1/src/TasmotaSerial.cpp
@@ -100,7 +100,7 @@ TasmotaSerial::TasmotaSerial(int receive_pin, int transmit_pin, int hardware_fal
       m_buffer = (uint8_t*)malloc(TM_SERIAL_BUFFER_SIZE);
       if (m_buffer == NULL) return;
       // Use getCycleCount() loop to get as exact timing as possible
-      m_bit_time = F_CPU / TM_SERIAL_BAUDRATE;
+      m_bit_time = ESP.getCpuFreqMHz() * 1000000 / TM_SERIAL_BAUDRATE;
       pinMode(m_rx_pin, INPUT);
       tms_obj_list[m_rx_pin] = this;
       attachInterrupt(m_rx_pin, ISRList[m_rx_pin], FALLING);
@@ -145,8 +145,8 @@ bool TasmotaSerial::begin(long speed, int stop_bits) {
     }
   } else {
     // Use getCycleCount() loop to get as exact timing as possible
-    m_bit_time = F_CPU / speed;
-    m_high_speed = (speed > 9600);
+    m_bit_time = ESP.getCpuFreqMHz() * 1000000 / speed;
+    m_high_speed = (speed >= 9600);
   }
   return m_valid;
 }
diff --git a/lib/TasmotaSerial-2.3.0/src/TasmotaSerial.h b/lib/TasmotaSerial-2.3.1/src/TasmotaSerial.h
similarity index 100%
rename from lib/TasmotaSerial-2.3.0/src/TasmotaSerial.h
rename to lib/TasmotaSerial-2.3.1/src/TasmotaSerial.h