diff --git a/.travis-ci.sh b/.travis-ci.sh
index f0d727f..71e748b 100755
--- a/.travis-ci.sh
+++ b/.travis-ci.sh
@@ -2,11 +2,6 @@
 
 set -ex
 
-
-# optional dependencies for running tests
-sudo apt-get install protobuf
-
-
 # build, run tests, build package, install package
 wget https://raw.githubusercontent.com/ocaml/ocaml-ci-scripts/master/.travis-opam.sh