diff --git a/README.md b/README.md
index 11d814a..d36c5cc 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ go-blockservice
 [![](https://img.shields.io/badge/project-IPFS-blue.svg?style=flat-square)](http://ipfs.io/)
 [![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23ipfs)
 [![Coverage Status](https://codecov.io/gh/ipfs/go-block-format/branch/master/graph/badge.svg)](https://codecov.io/gh/ipfs/go-block-format/branch/master)
-[![Travis CI](https://travis-ci.com/ipfs/go-blockservice.svg?branch=master)](https://travis-ci.com/ipfs/go-blockservice)
+[![Build Status](https://circleci.com/gh/ipfs/go-blockservice.svg?style=svg)](https://circleci.com/gh/ipfs/go-blockservice)
 
 > go-blockservice provides a seamless interface to both local and remote storage backends.
 
diff --git a/blockservice_test.go b/blockservice_test.go
index a94b672..dfd12fc 100644
--- a/blockservice_test.go
+++ b/blockservice_test.go
@@ -26,12 +26,18 @@ func TestWriteThroughWorks(t *testing.T) {
 	block := bgen.Next()
 
 	t.Logf("PutCounter: %d", bstore.PutCounter)
-	bserv.AddBlock(block)
+	err := bserv.AddBlock(block)
+	if err != nil {
+		t.Fatal(err)
+	}
 	if bstore.PutCounter != 1 {
 		t.Fatalf("expected just one Put call, have: %d", bstore.PutCounter)
 	}
 
-	bserv.AddBlock(block)
+	err = bserv.AddBlock(block)
+	if err != nil {
+		t.Fatal(err)
+	}
 	if bstore.PutCounter != 2 {
 		t.Fatalf("Put should have called again, should be 2 is: %d", bstore.PutCounter)
 	}
@@ -52,10 +58,15 @@ func TestLazySessionInitialization(t *testing.T) {
 	bgen := butil.NewBlockGenerator()
 
 	block := bgen.Next()
-	bstore.Put(block)
-
+	err := bstore.Put(block)
+	if err != nil {
+		t.Fatal(err)
+	}
 	block2 := bgen.Next()
-	session.HasBlock(block2)
+	err = session.HasBlock(block2)
+	if err != nil {
+		t.Fatal(err)
+	}
 
 	bsession := NewSession(ctx, bservSessEx)
 	if bsession.ses != nil {
diff --git a/go.sum b/go.sum
index 7824e56..0fc7ec2 100644
--- a/go.sum
+++ b/go.sum
@@ -48,8 +48,6 @@ github.com/gxed/hashland/murmur3 v0.0.1 h1:SheiaIt0sda5K+8FLz952/1iWS9zrnKsEJaOJ
 github.com/gxed/hashland/murmur3 v0.0.1/go.mod h1:KjXop02n4/ckmZSnY2+HKcLud/tcmvhST0bie/0lS48=
 github.com/hashicorp/golang-lru v0.5.1 h1:0hERBMJE1eitiLkihrMvRVBYAkpHzc/J3QdDN+dAcgU=
 github.com/hashicorp/golang-lru v0.5.1/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
-github.com/hashicorp/golang-lru v0.5.3 h1:YPkqC67at8FYaadspW/6uE0COsBxS2656RLEr8Bppgk=
-github.com/hashicorp/golang-lru v0.5.3/go.mod h1:iADmTwqILo4mZ8BN3D2Q6+9jd8WM5uGBxy+E8yxSoD4=
 github.com/hashicorp/golang-lru v0.5.4 h1:YDjusn29QI/Das2iO9M0BHnIbxPeyuCHsjMW+lJfyTc=
 github.com/hashicorp/golang-lru v0.5.4/go.mod h1:iADmTwqILo4mZ8BN3D2Q6+9jd8WM5uGBxy+E8yxSoD4=
 github.com/hpcloud/tail v1.0.0 h1:nfCOvKYfkgYP8hkirhJocXT2+zOD8yUNjXaWfTlyFKI=
@@ -70,8 +68,7 @@ github.com/ipfs/go-cid v0.0.1 h1:GBjWPktLnNyX0JiQCNFpUuUSoMw5KMyqrsejHYlILBE=
 github.com/ipfs/go-cid v0.0.1/go.mod h1:GHWU/WuQdMPmIosc4Yn1bcCT7dSeX4lBafM7iqUPQvM=
 github.com/ipfs/go-cid v0.0.2 h1:tuuKaZPU1M6HcejsO3AcYWW8sZ8MTvyxfc4uqB4eFE8=
 github.com/ipfs/go-cid v0.0.2/go.mod h1:GHWU/WuQdMPmIosc4Yn1bcCT7dSeX4lBafM7iqUPQvM=
-github.com/ipfs/go-cid v0.0.3 h1:UIAh32wymBpStoe83YCzwVQQ5Oy/H0FdxvUS6DJDzms=
-github.com/ipfs/go-cid v0.0.3/go.mod h1:GHWU/WuQdMPmIosc4Yn1bcCT7dSeX4lBafM7iqUPQvM=
+github.com/ipfs/go-cid v0.0.4/go.mod h1:4LLaPOQwmk5z9LBgQnpkivrx8BJjUyGwTXCd5Xfj6+M=
 github.com/ipfs/go-cid v0.0.5 h1:o0Ix8e/ql7Zb5UVUJEUfjsWCIY8t48++9lR8qi6oiJU=
 github.com/ipfs/go-cid v0.0.5/go.mod h1:plgt+Y5MnOey4vO4UlUazGqdbEXuFYitED67FexhXog=
 github.com/ipfs/go-datastore v0.0.1 h1:AW/KZCScnBWlSb5JbnEnLKFWXL224LBEh/9KXXOrUms=
@@ -88,8 +85,6 @@ github.com/ipfs/go-ds-badger v0.0.2/go.mod h1:Y3QpeSFWQf6MopLTiZD+VT6IC1yZqaGmjv
 github.com/ipfs/go-ds-leveldb v0.0.1/go.mod h1:feO8V3kubwsEF22n0YRQCffeb79OOYIykR4L04tMOYc=
 github.com/ipfs/go-ipfs-blockstore v0.0.1 h1:O9n3PbmTYZoNhkgkEyrXTznbmktIXif62xLX+8dPHzc=
 github.com/ipfs/go-ipfs-blockstore v0.0.1/go.mod h1:d3WClOmRQKFnJ0Jz/jj/zmksX0ma1gROTlovZKBmN08=
-github.com/ipfs/go-ipfs-blockstore v0.1.1 h1:+PAFREAlSxLs9IEtrRcnJ/DqWkGlDa+l547WFZnohNw=
-github.com/ipfs/go-ipfs-blockstore v0.1.1/go.mod h1:8gZOgIN5e+Xdg2YSGdwTTRbguSVjYyosIDRQCY8E9QM=
 github.com/ipfs/go-ipfs-blockstore v0.1.4 h1:2SGI6U1B44aODevza8Rde3+dY30Pb+lbcObe1LETxOQ=
 github.com/ipfs/go-ipfs-blockstore v0.1.4/go.mod h1:Jxm3XMVjh6R17WvxFEiyKBLUGr86HgIYJW/D/MwqeYQ=
 github.com/ipfs/go-ipfs-blocksutil v0.0.1 h1:Eh/H4pc1hsvhzsQoMEP3Bke/aW5P5rVM1IWFJMcGIPQ=
diff --git a/test/blocks_test.go b/test/blocks_test.go
index 95f552d..ee808e6 100644
--- a/test/blocks_test.go
+++ b/test/blocks_test.go
@@ -74,7 +74,10 @@ func TestGetBlocksSequential(t *testing.T) {
 	var cids []cid.Cid
 	for _, o := range objs {
 		cids = append(cids, o.Cid())
-		servs[0].AddBlock(o)
+		err := servs[0].AddBlock(o)
+		if err != nil {
+			t.Fatal(err)
+		}
 	}
 
 	t.Log("one instance at a time, get blocks concurrently")