--- a/runtime/syntax/arduino.vim
+++ b/runtime/syntax/arduino.vim
@@ -1,50 +1,79 @@
 " Vim syntax file
 " Language:    Arduino
 " Maintainer:  Johannes Hoff <johannes@johanneshoff.com>
-" Last Change: 2011 June 3
+" Last Change: 21 October 2021
 " License:     VIM license (:help license, replace vim by arduino.vim)
 
 " Syntax highlighting like in the Arduino IDE
-" Keywords extracted from <arduino>/build/shared/lib/keywords.txt (arduino
-" version 0021)
+" Automatically generated by the script available at
+"    https://bitbucket.org/johannes/arduino-vim-syntax
+" Using keywords from <arduino>/build/shared/lib/keywords.txt
+" From version: 1.8.16
 
-" Thanks to Rik, Erik Nomitch, Adam Obeng and Graeme Cross for helpful feedback!
+" Thanks to Rik, Erik Nomitch, Adam Obeng, Graeme Cross and Niall Parker
+" for helpful feedback!
 
-" quit when a syntax file was already loaded
-if exists("b:current_syntax")
+" For version 5.x: Clear all syntax items
+" For version 6.x: Quit when a syntax file was already loaded
+if version < 600
+  syntax clear
+elseif exists("b:current_syntax")
   finish
 endif
 
 " Read the C syntax to start with
-runtime! syntax/cpp.vim
+if version < 600
+  so <sfile>:p:h/cpp.vim
+else
+  runtime! syntax/cpp.vim
+endif
 
-syn keyword arduinoConstant HIGH LOW INPUT OUTPUT
-syn keyword arduinoConstant DEC BIN HEX OCT BYTE
-syn keyword arduinoConstant PI HALF_PI TWO_PI
-syn keyword arduinoConstant LSBFIRST MSBFIRST 
-syn keyword arduinoConstant CHANGE FALLING RISING 
-syn keyword arduinoConstant SERIAL DISPLAY
-syn keyword arduinoConstant DEFAULT EXTERNAL INTERNAL INTERNAL1V1 INTERNAL2V56
+syn keyword arduinoConstant  BIN CHANGE DEC DEFAULT EXTERNAL FALLING HALF_PI HEX
+syn keyword arduinoConstant  HIGH INPUT INPUT_PULLUP INTERNAL INTERNAL1V1
+syn keyword arduinoConstant  INTERNAL2V56 LED_BUILTIN LED_BUILTIN_RX
+syn keyword arduinoConstant  LED_BUILTIN_TX LOW LSBFIRST MSBFIRST OCT OUTPUT PI
+syn keyword arduinoConstant  RISING TWO_PI
+
+syn keyword arduinoFunc      analogRead analogReadResolution analogReference
+syn keyword arduinoFunc      analogWrite analogWriteResolution attachInterrupt
+syn keyword arduinoFunc      bit bitClear bitRead bitSet bitWrite delay
+syn keyword arduinoFunc      delayMicroseconds detachInterrupt
+syn keyword arduinoFunc      digitalPinToInterrupt digitalRead digitalWrite
+syn keyword arduinoFunc      highByte interrupts lowByte micros millis
+syn keyword arduinoFunc      noInterrupts noTone pinMode pulseIn pulseInLong
+syn keyword arduinoFunc      shiftIn shiftOut tone yield
 
-syn keyword arduinoStdFunc abs acos asin atan atan2 ceil constrain
-syn keyword arduinoStdFunc cos degrees exp floor log
-syn keyword arduinoStdFunc map max min pow radians 
-syn keyword arduinoStdFunc round sin sq sqrt tan
-syn keyword arduinoStdFunc randomSeed random
+syn keyword arduinoMethod    available availableForWrite begin charAt compareTo
+syn keyword arduinoMethod    concat end endsWith equals equalsIgnoreCase export
+syn keyword arduinoMethod    final find findUntil flush getBytes indexOf
+syn keyword arduinoMethod    lastIndexOf length loop override parseFloat
+syn keyword arduinoMethod    parseInt peek print println read readBytes
+syn keyword arduinoMethod    readBytesUntil readString readStringUntil replace
+syn keyword arduinoMethod    setCharAt setTimeout setup startsWith Stream
+syn keyword arduinoMethod    substring toCharArray toInt toLowerCase toUpperCase
+syn keyword arduinoMethod    trim
+
+syn keyword arduinoModule    Keyboard Mouse Serial Serial1 Serial2 Serial3
+syn keyword arduinoModule    SerialUSB
 
-syn keyword arduinoFunc analogReference analogRead analogWrite 
-syn keyword arduinoFunc attachInterrupt detachInterrupt interrupts noInterrupts 
-syn keyword arduinoFunc lowByte highByte bitRead bitWrite bitSet bitClear
-syn keyword arduinoFunc millis micros delay delayMicroseconds 
-syn keyword arduinoFunc pinMode digitalWrite digitalRead 
-syn keyword arduinoFunc tone noTone pulseIn shiftOut 
+syn keyword arduinoStdFunc   abs accept acos acosf asin asinf atan atan2 atan2f
+syn keyword arduinoStdFunc   atanf cbrt cbrtf ceil ceilf click constrain
+syn keyword arduinoStdFunc   copysign copysignf cos cosf cosh coshf degrees exp
+syn keyword arduinoStdFunc   expf fabs fabsf fdim fdimf floor floorf fma fmaf
+syn keyword arduinoStdFunc   fmax fmaxf fmin fminf fmod fmodf hypot hypotf
+syn keyword arduinoStdFunc   isfinite isinf isnan isPressed ldexp ldexpf log
+syn keyword arduinoStdFunc   log10 log10f logf lrint lrintf lround lroundf map
+syn keyword arduinoStdFunc   max min move pow powf press radians random
+syn keyword arduinoStdFunc   randomSeed release releaseAll round roundf signbit
+syn keyword arduinoStdFunc   sin sinf sinh sinhf sq sqrt sqrtf tan tanf tanh
+syn keyword arduinoStdFunc   tanhf trunc truncf
 
-syn keyword arduinoMethod setup loop
-syn keyword arduinoMethod begin end available read flush print println write peek
-
-syn keyword arduinoType boolean byte word String 
-
-syn keyword arduinoModule Serial Serial1 Serial2 Serial3
+syn keyword arduinoType      _Bool _Complex _Imaginary array atomic_bool
+syn keyword arduinoType      atomic_char atomic_int atomic_llong atomic_long
+syn keyword arduinoType      atomic_schar atomic_short atomic_uchar atomic_uint
+syn keyword arduinoType      atomic_ullong atomic_ulong atomic_ushort boolean
+syn keyword arduinoType      byte char16_t char32_t complex NULL null PROGMEM
+syn keyword arduinoType      String word
 
 hi def link arduinoType Type
 hi def link arduinoConstant Constant