diff --git a/avers-api.cabal b/avers-api.cabal
--- a/avers-api.cabal
+++ b/avers-api.cabal
@@ -1,5 +1,5 @@
 name:                avers-api
-version:             0.0.3
+version:             0.0.4
 synopsis:            Types describing the core and extended Avers APIs
 description:         See README
 homepage:            http://github.com/wereHamster/avers-api
diff --git a/src/Avers/API/Instances.hs b/src/Avers/API/Instances.hs
--- a/src/Avers/API/Instances.hs
+++ b/src/Avers/API/Instances.hs
@@ -13,3 +13,6 @@
 
 instance FromText RevId where
     fromText x = fromText x >>= Just . RevId
+
+instance FromText BlobId where
+    fromText x = fromText x >>= Just . BlobId