diff --git a/.travis.yml b/.travis.yml
index 765893d..e351558 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,8 +7,8 @@ php:
   - 7.1
 
 env:
-  - V8VER=5.2
-  - V8VER=5.1
+  - V8VER=6.5
+  - V8VER=6.3
 
 before_install: make -f Makefile.travis before_install
 install: make -f Makefile.travis install
diff --git a/Makefile.travis b/Makefile.travis
index 18a3c08..25e23d1 100644
--- a/Makefile.travis
+++ b/Makefile.travis
@@ -1,5 +1,5 @@
 # Configure and build scripts for travis CI system
-V8VER ?= 5.1
+V8VER ?= 6.3
 
 export NO_INTERACTION=1
 export REPORT_EXIT_STATUS=1