diff --git a/.circleci/config.yml b/.circleci/config.yml
index 0e0f750..fa08dde 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -7,10 +7,11 @@ experimental:
         - master
         - v2
         - v3
+        - v4
 
 jobs:
   go-test:
-    working_directory: /go/src/gopkg.in/launchdarkly/go-client.v3
+    working_directory: /go/src/gopkg.in/launchdarkly/go-client.v4
 
     docker:
       - image: circleci/golang:1.9
diff --git a/README.md b/README.md
index 15b2740..54ca99a 100644
--- a/README.md
+++ b/README.md
@@ -9,13 +9,13 @@ Quick setup
 1. Install the SDK with the `go` tool:
 
 ```bash
-go get gopkg.in/launchdarkly/go-client.v3
+go get gopkg.in/launchdarkly/go-client.v4
 ```
 
 2. Import the LaunchDarkly client:
 
 ```go
-import ld "gopkg.in/launchdarkly/go-client.v3"
+import ld "gopkg.in/launchdarkly/go-client.v4"
 ```
 
 3. Create a new LDClient with your SDK key:
diff --git a/feature_store_test.go b/feature_store_test.go
index 919a452..d8e7088 100644
--- a/feature_store_test.go
+++ b/feature_store_test.go
@@ -3,8 +3,8 @@ package ldclient_test
 import (
 	"testing"
 
-	ld "gopkg.in/launchdarkly/go-client.v3"
-	ldtest "gopkg.in/launchdarkly/go-client.v3/shared_test"
+	ld "gopkg.in/launchdarkly/go-client.v4"
+	ldtest "gopkg.in/launchdarkly/go-client.v4/shared_test"
 )
 
 func makeInMemoryStore() ld.FeatureStore {
diff --git a/redis/redis.go b/redis/redis.go
index b1cd580..2cbb55a 100644
--- a/redis/redis.go
+++ b/redis/redis.go
@@ -12,7 +12,7 @@ import (
 	r "github.com/garyburd/redigo/redis"
 	"github.com/patrickmn/go-cache"
 
-	ld "gopkg.in/launchdarkly/go-client.v3"
+	ld "gopkg.in/launchdarkly/go-client.v4"
 )
 
 // A Redis-backed feature store.
diff --git a/redis/redis_test.go b/redis/redis_test.go
index e2f7608..19dce9a 100644
--- a/redis/redis_test.go
+++ b/redis/redis_test.go
@@ -7,8 +7,8 @@ import (
 
 	r "github.com/garyburd/redigo/redis"
 	"github.com/stretchr/testify/assert"
-	ld "gopkg.in/launchdarkly/go-client.v3"
-	ldtest "gopkg.in/launchdarkly/go-client.v3/shared_test"
+	ld "gopkg.in/launchdarkly/go-client.v4"
+	ldtest "gopkg.in/launchdarkly/go-client.v4/shared_test"
 )
 
 func makeRedisStore() ld.FeatureStore {
diff --git a/shared_test/feature_store.go b/shared_test/feature_store.go
index 6f3e5f2..6b7ebe6 100644
--- a/shared_test/feature_store.go
+++ b/shared_test/feature_store.go
@@ -5,7 +5,7 @@ import (
 
 	"github.com/stretchr/testify/assert"
 
-	ld "gopkg.in/launchdarkly/go-client.v3"
+	ld "gopkg.in/launchdarkly/go-client.v4"
 )
 
 func RunFeatureStoreTests(t *testing.T, makeStore func() ld.FeatureStore) {