diff --git a/.travis.yml b/.travis.yml
index 4edcd67..e55c176 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,6 @@
 language: c
 env:
-  - OCAML_VERSION=4.01.0
   - OCAML_VERSION=4.02.3
-  - OCAML_VERSION=4.04.2
   - OCAML_VERSION=4.05.0
   - OCAML_VERSION=4.05.0+flambda
   - OCAML_VERSION=4.06.0
@@ -13,9 +11,9 @@ addons:
     packages:
       - opam
 # Caching may take a lot of space with so many ocaml versions
-#cache:
-#  directories:
-#    - $HOME/.opam
+cache:
+  directories:
+    - $HOME/.opam
 before_install:
   # Some opam boilerplate
   - export OPAMYES=1