diff --git a/.travis.yml b/.travis.yml
index 55571e0..38d8dd9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,6 +15,8 @@ install:
     - sudo apt-get update
     - sudo apt-get upgrade -y
     - sudo apt-get install -y opencpu-server
+    - curl https://cran.r-project.org/src/contrib/semver_0.2.0.tar.gz -o semver_0.2.0.tar.gz
+    - sudo R CMD INSTALL semver_0.2.0.tar.gz
 
 script:
     - go test -v -covermode=count -coverprofile=profile.cov
diff --git a/README.md b/README.md
index ba463c0..a63f8b7 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ arrgh (Pronunciation: /ɑː/ or /är/) is an interface to the [OpenCPU](https://
 
 ## Installation
 
-arrgh requires a [Go](http://golang.org) installation, and if using a local R instance [OpenCPU](https://www.opencpu.org/download.html) must be installed as an R package.
+arrgh requires a [Go](http://golang.org) installation, and if using a local R instance [OpenCPU](https://www.opencpu.org/download.html) and [smever](https://cran.r-project.org/web/packages/semver/index.html) must be installed as R packages.
 
 ## Documentation