diff --git a/.travis.yml b/.travis.yml
index 7578689..a156bc1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,6 +2,9 @@ language: php
 php:
   - 5.6
   - 7.0
+  - 7.1
+  - 7.2
+  - 7.3
 before_install:
   - composer self-update
   - bash test/bin/build_etcd.sh
diff --git a/composer.json b/composer.json
index 5dd03a8..77eb68e 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,8 @@
   ],
   "require" : {
     "php": ">=5.6.0",
-    "ext-curl" : "*"
+    "ext-curl" : "*",
+    "ext-json": "*"
   },
   "require-dev" : {
     "phpunit/phpunit": "~5.0"
diff --git a/test/bin/build_etcd.sh b/test/bin/build_etcd.sh
old mode 100644
new mode 100755
index f768ebe..b29b1c6
--- a/test/bin/build_etcd.sh
+++ b/test/bin/build_etcd.sh
@@ -1,13 +1,9 @@
 #!/bin/bash
 
-wget -c https://storage.googleapis.com/golang/go1.4.linux-amd64.tar.gz
-tar -zxf go1.4.linux-amd64.tar.gz
+wget -c https://dl.google.com/go/go1.13.3.linux-amd64.tar.gz
+tar -zxf go1.13.3.linux-amd64.tar.gz
 git clone https://github.com/coreos/etcd.git
 export GOROOT=$PWD/go
-#export GOPATH=$PWD/go
-export PATH=$GOPATH/bin:$PATH
-go get golang.org/x/tools/cmd/cove
-go get golang.org/x/tools/cmd/vet
 cd etcd && ./build
 
 # Start etcd