diff --git a/Cargo.toml b/Cargo.toml
index 5ae96727..3f75cfc3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "elements"
-version = "0.12.0"
+version = "0.12.1"
 authors = ["Andrew Poelstra <apoelstra@blockstream.com>"]
 description = "Library with support for de/serialization, parsing and executing on data structures and network messages related to Elements"
 license = "CC0-1.0"
@@ -24,4 +24,4 @@ optional = true
 
 [dev-dependencies]
 rand = "0.6.5"
-serde_json = "1"
+serde_json = "<=1.0.44"
diff --git a/src/transaction.rs b/src/transaction.rs
index 0d5369be..561eae53 100644
--- a/src/transaction.rs
+++ b/src/transaction.rs
@@ -596,8 +596,16 @@ impl Transaction {
         self.lock_time.consensus_encode(&mut enc).unwrap();
         bitcoin::Txid::from_engine(enc)
     }
+
+    /// Get the witness txid of the transaction.
+    pub fn wtxid(&self) -> bitcoin::Wtxid {
+        let mut enc = Txid::engine();
+        self.consensus_encode(&mut enc).unwrap();
+        bitcoin::Wtxid::from_engine(enc)
+    }
 }
 
+//TODO(stevenroose) remove this, it's incorrect
 impl BitcoinHash<Txid> for Transaction {
     /// To get a transaction's txid, which is usually what you want, use the `txid` method.
     fn bitcoin_hash(&self) -> Txid {