diff --git a/.travis.yml b/.travis.yml
index ccf8592..af6a8d9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,7 @@
 language: c
 sudo: required
 before_install:
+- sudo apt update
 - sudo apt install -y gcc git wget make libncurses-dev flex bison python python-serial ninja-build
 - wget https://dl.espressif.com/dl/xtensa-lx106-elf-linux64-1.22.0-100-ge567ec7-5.2.0.tar.gz