diff --git a/zip-0252.rst b/zip-0252.rst
index 57683922..37c3335a 100644
--- a/zip-0252.rst
+++ b/zip-0252.rst
@@ -4,7 +4,7 @@
   Title: Deployment of the NU5 Network Upgrade
   Owners: teor <teor@zfnd.org>
           Daira Hopwood <daira@electriccoin.co>
-  Status: Draft
+  Status: Proposed
   Category: Consensus / Network
   Created: 2021-02-23
   License: MIT
@@ -48,6 +48,7 @@ The primary sources of information about NU5 consensus protocol changes are:
 - ZIP 224: Orchard Shielded Protocol [#zip-0224]_ *proposed*
 - ZIP 225: Version 5 Transaction Format [#zip-0225]_ *proposed*
 - ZIP 244: Transaction Identifier Non-Malleability [#zip-0244]_ *proposed*
+- The Orchard Book [#orchard-book]_
 
 The network handshake and peer management mechanisms defined in ZIP 201 [#zip-0201]_
 also apply to this upgrade.
@@ -176,15 +177,14 @@ strict request-response sequence that Zebra expects.)
 References
 ==========
 
-**TODO: Update spec versions**
-
 .. [#RFC2119] `RFC 2119: Key words for use in RFCs to Indicate Requirement Levels <https://www.rfc-editor.org/rfc/rfc2119.html>`_
-.. [#protocol] `Zcash Protocol Specification, Version 2020.1.15 or later <protocol/canopy.pdf>`_
-.. [#protocol-networks] `Zcash Protocol Specification, Version 2020.1.15. Section 3.11: Mainnet and Testnet <protocol/canopy.pdf#networks>`_
-.. [#protocol-txnencodingandconsensus] `Zcash Protocol Specification, Version 2020.1.15. Section 7.1: Transaction Encoding and Consensus <protocol/canopy.pdf#txnencodingandconsensus>`_
+.. [#protocol] `Zcash Protocol Specification, Version 2021.1.17 or later <protocol/nu5.pdf>`_
+.. [#protocol-networks] `Zcash Protocol Specification, Version 2021.1.17. Section 3.11: Mainnet and Testnet <protocol/nu5.pdf#networks>`_
+.. [#protocol-txnencodingandconsensus] `Zcash Protocol Specification, Version 2021.1.17. Section 7.1: Transaction Encoding and Consensus <protocol/nu5.pdf#txnencodingandconsensus>`_
 .. [#zip-0200] `ZIP 200: Network Upgrade Activation Mechanism <zip-0200.rst>`_
 .. [#zip-0201] `ZIP 201: Network Peer Management for Overwinter <zip-0201.rst>`_
 .. [#zip-0216] `ZIP 216: Require Canonical Point Encodings <zip-0216.rst>`_
 .. [#zip-0224] `ZIP 224: Orchard Shielded Protocol <zip-0224.rst>`_
 .. [#zip-0225] `ZIP 225: Version 5 Transaction Format <zip-0225.rst>`_
 .. [#zip-0244] `ZIP 244: Transaction Identifier Non-Malleability <zip-0244.rst>`_
+.. [#orchard-book] `The Orchard Book <https://zcash.github.io/orchard/>`_