diff --git a/.travis.yml b/.travis.yml
index a9a3e37a..69476460 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,5 @@
 language: php
-dist: xenial
+dist: bionic
 php:
   - '7.2'
   - '7.3'
diff --git a/tests/scripts/cacert.sh b/tests/scripts/cacert.sh
index d1b41520..262a3253 100755
--- a/tests/scripts/cacert.sh
+++ b/tests/scripts/cacert.sh
@@ -4,7 +4,7 @@ CURRENT_COMMAND="$(curl -s "https://curl.haxx.se/ca/cacert.pem.sha256")"
 CURRENT_PARTS=($CURRENT_COMMAND)
 CURRENT_SHA="${CURRENT_PARTS[0]}"
 
-FILE_COMMAND="$(openssl sha -sha256 src/cacert.pem)"
+FILE_COMMAND="$(openssl dgst -sha256 src/cacert.pem)"
 FILE_PARTS=($FILE_COMMAND)
 FILE_SHA="${FILE_PARTS[1]}"