diff --git a/pymata4/private_constants.py b/pymata4/private_constants.py
index 54ae382..9adc70f 100644
--- a/pymata4/private_constants.py
+++ b/pymata4/private_constants.py
@@ -70,7 +70,7 @@ class PrivateConstants:
     SYSEX_REALTIME = 0x7F  # MIDI Reserved for realtime messages
 
     # reserved for PyMata
-    PYMATA_EXPRESS_THREADED_VERSION = "1.04"
+    PYMATA_EXPRESS_THREADED_VERSION = "1.4"
 
     # each byte represents a digital port
     #  and its value contains the current port settings
diff --git a/setup.py b/setup.py
index fef09d3..82083c8 100644
--- a/setup.py
+++ b/setup.py
@@ -11,7 +11,7 @@
     packages=['pymata4'],
     install_requires=['pyserial'],
 
-    version='1.04',
+    version='1.4',
     description="A Python Protocol Abstraction Library For Arduino Firmata",
     long_description=long_description,
     long_description_content_type='text/markdown',