diff --git a/client/commands/query/get.go b/client/commands/query/get.go
index 3047952b9..ecf230f1a 100644
--- a/client/commands/query/get.go
+++ b/client/commands/query/get.go
@@ -11,6 +11,7 @@ import (
 	wire "github.com/tendermint/go-wire"
 	"github.com/tendermint/go-wire/data"
 	lc "github.com/tendermint/light-client"
+	"github.com/tendermint/light-client/certifiers"
 	"github.com/tendermint/light-client/proofs"
 	"github.com/tendermint/merkleeyes/iavl"
 	"github.com/tendermint/tendermint/rpc/client"
@@ -18,10 +19,6 @@ import (
 	"github.com/tendermint/basecoin/client/commands"
 )
 
-type Certifier interface {
-	Certify(check lc.Checkpoint) error
-}
-
 // GetParsed does most of the work of the query commands, but is quite
 // opinionated, so if you want more control about parsing, call Get
 // directly.
@@ -73,7 +70,7 @@ func GetWithProof(key []byte) (data.Bytes, uint64,
 	return getWithProof(key, node, cert)
 }
 
-func getWithProof(key []byte, node client.Client, cert Certifier) (data.Bytes, uint64,
+func getWithProof(key []byte, node client.Client, cert certifiers.Certifier) (data.Bytes, uint64,
 	*iavl.KeyExistsProof, *iavl.KeyNotExistsProof, error) {
 
 	resp, err := node.ABCIQuery("/key", key, true)
@@ -133,7 +130,7 @@ func getWithProof(key []byte, node client.Client, cert Certifier) (data.Bytes, u
 // GetCertifiedCheckpoint gets the signed header for a given height
 // and certifies it.  Returns error if unable to get a proven header.
 func GetCertifiedCheckpoint(h int, node client.Client,
-	cert Certifier) (empty lc.Checkpoint, err error) {
+	cert certifiers.Certifier) (empty lc.Checkpoint, err error) {
 	// get the checkpoint for this height
 
 	// FIXME: cannot use cert.GetByHeight for now, as it also requires
diff --git a/glide.lock b/glide.lock
index 5d0c74a71..bb4b3cb4c 100644
--- a/glide.lock
+++ b/glide.lock
@@ -1,5 +1,5 @@
 hash: 2848c30b31fb205f846dd7dfca14ebed8a3249cbc5aaa759066b2bab3e4bbf42
-updated: 2017-08-04T15:38:45.048261895+02:00
+updated: 2017-08-08T18:32:19.025782383+02:00
 imports:
 - name: github.com/bgentry/speakeasy
   version: 4aabc24848ce5fd31929f7d1e4ea74d3709c14cd
@@ -135,7 +135,7 @@ imports:
   - data
   - data/base58
 - name: github.com/tendermint/light-client
-  version: fcf4e411583135a1900157b8b0274c41e20ea3a1
+  version: b2afece9635d11e77dd404019b9cf3885d34f4e5
   subpackages:
   - certifiers
   - certifiers/client
@@ -166,6 +166,7 @@ imports:
   - rpc/lib/client
   - rpc/lib/server
   - rpc/lib/types
+  - rpc/test
   - state
   - state/txindex
   - state/txindex/kv