diff --git a/.travis.yml b/.travis.yml
index 12ebdc2..0052e7a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,5 +4,6 @@ before_install:
  - cd R
 
 language: R
+r: devel
 sudo: false
 cache: packages
diff --git a/appveyor.yml b/appveyor.yml
index ad1f580..b9cbe28 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -24,6 +24,7 @@ cache:
 # Adapt as necessary starting from here
 
 environment:
+  R_VERSION: devel
   PKGTYPE: binary
 
 build_script: