diff --git a/interface.go b/interface.go
index 675592f..42fe6a8 100644
--- a/interface.go
+++ b/interface.go
@@ -25,8 +25,8 @@ type Interface interface { // type Exchanger interface
 // Fetcher is an object that can be used to retrieve blocks
 type Fetcher interface {
 	// GetBlock returns the block associated with a given key.
-	GetBlock(context.Context, *cid.Cid) (blocks.Block, error)
-	GetBlocks(context.Context, []*cid.Cid) (<-chan blocks.Block, error)
+	GetBlock(context.Context, cid.Cid) (blocks.Block, error)
+	GetBlocks(context.Context, []cid.Cid) (<-chan blocks.Block, error)
 }
 
 // SessionExchange is an exchange.Interface which supports
diff --git a/package.json b/package.json
index c8de6c7..ecf6e9a 100644
--- a/package.json
+++ b/package.json
@@ -9,15 +9,15 @@
   "gxDependencies": [
     {
       "author": "stebalien",
-      "hash": "QmWAzSEoqZ6xU6pu8yL8e5WaMb7wtbfbhhN4p1DknUPtr3",
+      "hash": "QmRcHuYzAyswytBuMF78rj3LTChYszomRFXNg4685ZN1WM",
       "name": "go-block-format",
-      "version": "0.1.11"
+      "version": "0.2.0"
     },
     {
       "author": "whyrusleeping",
-      "hash": "QmZFbDTY9jfSBms2MchvYM9oYRbAF19K7Pby47yDBfpPrb",
+      "hash": "QmPSQnBKM9g7BaUcZCvswUJVscQ1ipjmwxN5PXCjkp9EQ7",
       "name": "go-cid",
-      "version": "0.8.0"
+      "version": "0.9.0"
     }
   ],
   "gxVersion": "0.12.1",