Teensyduino 1.53 has been released.

https://www.pjrc.com/teensy/td_download.html

1.53 brings support for Arduino 1.8.13, which greatly improves stability on MacOS Catalina. NativeEthernet library was added for Teensy 4.1 ethernet. Support for C++ STL is improved. A digitalToggle(pin) function can now be used alongside digitalWrite(pin, state). Old libraries were removed. The installer now checks udev rules are up to date on Linux systems. Many minor issues were fixed.


Changes since Teensyduino 1.53-beta3:

Fix audio library on Teensy LC
Fix ST7735_t3 spitftbitmap example (KurtE)


The full list of changes since Teensyduino 1.52:

Support for Arduino 1.8.13
Reduce EventResponder and yield() overhead (KurtE)
Audio design tool checks I/O compatibility (thanks to Frank's JavaScript work)
Update audio design tool documentation
Speed up ILI9341_t3 and add setClock (Larry Bank)
USBHost_t36 add Keyboard attachRawPress & attachRawRelease (David "plugz")
Fix DmxSimple on Teensy 4.0 (Adam Demuri)
add pgmspace.h (not avr folder) compatability for Teensy 4.0
minor updates to SD and Wire examples
Improve C++ STL support
Fix compiler warnings in several library examples
Update libraries: FastLED, MIDI, RA8875, Adafruit_NeoPixel, FlexCAN, FlexCAN_T4, ILI9488_t3
Entropy library support for Teensy 4.x random number hardware
ILI9341_t3 proportional font rendering speedup (Larry Bank)
Audio: add rectifier effect and vocoder example by Bradley Sanders
Fix serialEventUSB1 & serialEventUSB2 on Teensy 4.x (KurtE)
Add MIDIUSB.h compatibility on Teensy 4.x
Check hardware serial FIFO in avalable and peek (KurtE)
Remove libraries: Adafruit_GFX, Adafruit_CC3000, Adafruit_RA8875, openGLCD, ST7565
Add SPI.end() on Teensy 4.x (KurtE)
Fix PT8211 output on Teensy 4.x
Fix USB BDT clear at startup on Teensy 3.x (Memotech-Bill)
Add digitalToggle(pin)
Fix numerical overflow in Audio CPU usage on Teensy 4.x
Remane addStorage to addMemory
Add Teensy 3.5/3.6 hardware random to Entropy (Manitou)
Fix ILI9341_r4 readcommand() & add readScanLine() on Teensy 4.x
Installer will delete old/stale libraries
Linux installer checks udev rules
Libraries updated: ADC, ILI9488_t3, RA8875
Fix audio library on Teensy LC
Fix ST7735_t3 spitftbitmap example (KurtE)