diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index b4a6f40..0333395 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -98,16 +98,13 @@ jobs:
       - name: Copy boot_app0.bin
         run: cp ~/.platformio/packages/framework-arduinoespressif32/tools/partitions/boot_app0.bin .pio/build/${{ matrix.environment }}/boot_app0.bin
 
-      - name: Copy bootloader_dio_40m.bin
-        run: cp ~/.platformio/packages/framework-arduinoespressif32/tools/sdk/esp32/bin/bootloader_dio_40m.bin .pio/build/${{ matrix.environment }}/bootloader_dio_40m.bin
-
       - uses: actions/upload-artifact@v3
         with:
           name: opendtu-${{ matrix.environment }}
           path: |
             .pio/build/${{ matrix.environment }}/opendtu-${{ matrix.environment }}.bin
             .pio/build/${{ matrix.environment }}/partitions.bin
-            .pio/build/${{ matrix.environment }}/bootloader_dio_40m.bin
+            .pio/build/${{ matrix.environment }}/bootloader.bin
             .pio/build/${{ matrix.environment }}/boot_app0.bin
 
       - uses: actions/upload-artifact@v3
diff --git a/README.md b/README.md
index fb1edd5..226930f 100644
--- a/README.md
+++ b/README.md
@@ -147,7 +147,7 @@ Use a ESP32 flash tool of your choice (see next chapter) and flash the `.bin` fi
 
 | Address  | File                   |
 | ---------| ---------------------- |
-| 0x1000   | bootloader_dio_40m.bin |
+| 0x1000   | bootloader.bin         |
 | 0x8000   | partitions.bin         |
 | 0xe000   | boot_app0.bin          |
 | 0x10000  | opendtu-*.bin          |
@@ -158,7 +158,7 @@ For further updates you can just use the web interface and upload the `opendtu-*
 ```
 esptool.py --port /dev/ttyUSB0 --chip esp32 --before default_reset --after hard_reset \
   write_flash --flash_mode dout --flash_freq 40m --flash_size detect \
-  0x1000 bootloader_dio_40m.bin \
+  0x1000 bootloader.bin \
   0x8000 partitions.bin \
   0xe000 boot_app0.bin \
   0x10000 opendtu-generic.bin
diff --git a/platformio.ini b/platformio.ini
index 1f73180..0cab601 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -15,7 +15,7 @@ extra_configs =
 
 [env]
 framework = arduino
-platform = espressif32@>=5.2.0
+platform = espressif32@>=5.3.0
 
 build_flags =
     -D=${PIOENV}