use pypy4 on mac
diff --git a/.travis/install.sh b/.travis/install.sh
index bab2a17..63d55ed 100755
--- a/.travis/install.sh
+++ b/.travis/install.sh
@@ -38,8 +38,8 @@
             pyenv global 3.5.0
             ;;
         pypy)
-            pyenv install pypy-c-jit-latest
-            pyenv global pypy-c-jit-latest
+            pyenv install pypy-4.0.0
+            pyenv global pypy-4.0.0
             ;;
         pypy3)
             pyenv install pypy3-2.4.0