diff --git a/.travis.yml b/.travis.yml
index b527381..4821e4b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,14 +1,6 @@
-sudo: false
-language: bash
-os:
-  - linux
-
-addons:
-  apt:
-    packages:
-      - gperf
-      - python
-      - python-serial
+dist: bionic
+language: python
+python: "3.8"
 
 before_install:
   # Save path to the git respository
@@ -29,11 +21,11 @@ install:
   # Make xtensa-esp32-elf available for all terminal sessions
   - export PATH=$PATH:$HOME/esp/xtensa-esp32-elf/bin
   # Get ESP-IDF from github
-  - git clone --recursive --branch release/v3.3 https://github.com/espressif/esp-idf.git
+  - git clone --recursive --branch v3.3 --single-branch --shallow-submodules https://github.com/espressif/esp-idf.git
   # Set the path to ESP-IDF directory
   - export IDF_PATH=~/esp/esp-idf
   # Install python dependencies
-  - pip install --user -r $IDF_PATH/requirements.txt
+  - pip install --requirement $IDF_PATH/requirements.txt
 
 script:
   # Build project within the original repository
diff --git a/README.md b/README.md
index a9ade1c..bbba8cf 100644
--- a/README.md
+++ b/README.md
@@ -9,9 +9,7 @@ This is an example application for the Maxim Integrated DS18B20 Programmable Res
 
 It supports a single or multiple devices on the same 1-Wire bus.
 
-It is written and tested for v3.0 of the [ESP-IDF](https://github.com/espressif/esp-idf) environment, using the xtensa-esp32-elf toolchain (gcc version 5.2.0, crosstool-ng-1.22.0-80-g6c4433a).
-
-Support for ESP-IDF v2.1 is available on the [ESP-IDF_v2.1](https://github.com/DavidAntliff/esp32-ds18b20-example/tree/ESP-IDF_v2.1) branch.
+It is written and tested for v3.3 of the [ESP-IDF](https://github.com/espressif/esp-idf) environment, using the xtensa-esp32-elf toolchain (gcc version 5.2.0, crosstool-ng-1.22.0-80-g6c4433a).
 
 Ensure that submodules are cloned:
 
@@ -20,14 +18,9 @@ Ensure that submodules are cloned:
 Build the application with:
 
     $ cd esp32-ds18b20-example
-    $ make menuconfig    # set your serial configuration and the 1-Wire GPIO - see below
-    $ make flash monitor
-
-For version 3.2 or newer of ESP-IDF, you can build with the CMake build system:
-
-    $ $IDF_PATH/tools/idf.py menuconfig  # set your serial configuration and the 1-Wire GPIO - see below
-    $ $IDF_PATH/tools/idf.py build
-    $ $IDF_PATH/tools/idf.py flash monitor
+    $ idf.py menuconfig    # set your serial configuration and the 1-Wire GPIO - see below
+    $ idf.py build
+    $ idf.py -p (PORT) flash monitor
 
 The program should detect your connected devices and periodically obtain temperature readings from them, displaying them on the console.
 
@@ -42,7 +35,7 @@ This application makes use of the following components (included as submodules):
 
 To run this example, connect one or more DS18B20 devices to a single GPIO on the ESP32. Use the recommended pull-up resistor of 4.7 KOhms, connected to the 3.3V supply.
 
-`make menuconfig` can be used to set the 1-Wire GPIO.
+`idf.py menuconfig` can be used to set the 1-Wire GPIO.
 
 If you have several devices and see occasional CRC errors, consider using a 2.2 kOhm pull-up resistor instead. Also consider adding decoupling capacitors between the sensor supply voltage and ground, as close to each sensor as possible.