diff --git a/.travis.yml b/.travis.yml
index 408c289..603555a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,14 @@ sudo: false
 cache:
   directories:
     - $HOME/.stack
+    - $HOME/.ghc
+    - $HOME/.cabal
+addons:
+  apt:
+    packages:
+      - libgmp3-dev
 before_install:
+  - unset CC
   - mkdir -p ~/.local/bin
   - export PATH=$HOME/.local/bin:$PATH
   - travis_retry curl -L https://www.stackage.org/stack/linux-x86_64 | tar xz --wildcards --strip-components=1 -C ~/.local/bin '*/stack'