diff --git a/.travis.yml b/.travis.yml
index fe615d8..f032890 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,5 @@
 language: shell
+sudo: required
 
 env:
   global:
@@ -20,7 +21,7 @@ script:
   - cd ..
   - curl -sSL https://bin.equinox.io/c/4VmDzA7iaHb/ngrok-stable-linux-amd64.zip -o ngrok-stable-linux-amd64.zip && unzip ngrok-stable-linux-amd64.zip && export NGROK_BIN="$(pwd)/ngrok"
   - git clone https://github.com/Neilpang/acmetest.git && cp -r acme.sh acmetest/ && cd acmetest
-  - ./letest.sh
+  - sudo ./letest.sh
 
 
 matrix: