diff --git a/noisemeter-device/Doxyfile b/noisemeter-device/Doxyfile
index f23ee81..c0f8f74 100644
--- a/noisemeter-device/Doxyfile
+++ b/noisemeter-device/Doxyfile
@@ -48,7 +48,7 @@ PROJECT_NAME           = "Noisemeter Device"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 0.0.3
+PROJECT_NUMBER         = 0.0.4
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a
diff --git a/platformio.ini b/platformio.ini
index 6d15e83..d41ecbc 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -26,7 +26,7 @@ build_flags =
 	-std=gnu++17
 	-DBUILD_PLATFORMIO
 	-DNO_GLOBAL_EEPROM
-        -DNOISEMETER_VERSION=\"0.0.3\"
+        -DNOISEMETER_VERSION=\"0.0.4\"
 	-Wall -Wextra
 
 [env:esp32-pcb]