diff --git a/Cargo.lock b/Cargo.lock
index e4f3541b89..10903d9b84 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -6068,7 +6068,7 @@ dependencies = [
 
 [[package]]
 name = "zcash_protocol"
-version = "0.2.0"
+version = "0.3.0"
 dependencies = [
  "document-features",
  "incrementalmerkletree",
diff --git a/Cargo.toml b/Cargo.toml
index 4fabe1b733..61e8f1b7d2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -36,7 +36,7 @@ zcash_address = { version = "0.4", path = "components/zcash_address" }
 zcash_client_backend = { version = "0.13", path = "zcash_client_backend" }
 zcash_encoding = { version = "0.2.1", path = "components/zcash_encoding" }
 zcash_keys = { version = "0.3", path = "zcash_keys" }
-zcash_protocol = { version = "0.2", path = "components/zcash_protocol" }
+zcash_protocol = { version = "0.3", path = "components/zcash_protocol" }
 zip321 = { version = "0.1", path = "components/zip321" }
 
 zcash_note_encryption = "0.4"
diff --git a/components/zcash_protocol/CHANGELOG.md b/components/zcash_protocol/CHANGELOG.md
index e9f8e85647..618e983418 100644
--- a/components/zcash_protocol/CHANGELOG.md
+++ b/components/zcash_protocol/CHANGELOG.md
@@ -7,9 +7,13 @@ and this library adheres to Rust's notion of
 
 ## [Unreleased]
 
+## [0.3.0] - 2024-08-26
+### Changed
+- Testnet activation height has been set for `consensus::BranchId::Nu6`.
+
 ### Removed
-- `impl {Add, Sub} for BlockHeight` - these operations were unused, and block
-  heights are a vector space, not a monoid.
+- `impl {Add, Sub} for BlockHeight` - these operations were unused, and it
+  does not make sense to add block heights (it is not a monoid.)
 
 ## [0.2.0] - 2024-08-19
 ### Added
diff --git a/components/zcash_protocol/Cargo.toml b/components/zcash_protocol/Cargo.toml
index 2e88482c80..20ac967d61 100644
--- a/components/zcash_protocol/Cargo.toml
+++ b/components/zcash_protocol/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "zcash_protocol"
 description = "Zcash protocol network constants and value types."
-version = "0.2.0"
+version = "0.3.0"
 authors = [
     "Jack Grigg <jack@electriccoin.co>",
     "Kris Nuttycombe <kris@nutty.land>",
diff --git a/supply-chain/imports.lock b/supply-chain/imports.lock
index 0145b6d3ba..d29120700c 100644
--- a/supply-chain/imports.lock
+++ b/supply-chain/imports.lock
@@ -237,13 +237,6 @@ user-id = 169181
 user-login = "nuttycom"
 user-name = "Kris Nuttycombe"
 
-[[publisher.zcash_client_sqlite]]
-version = "0.11.0"
-when = "2024-08-20"
-user-id = 169181
-user-login = "nuttycom"
-user-name = "Kris Nuttycombe"
-
 [[publisher.zcash_client_sqlite]]
 version = "0.11.1"
 when = "2024-08-21"
@@ -300,8 +293,8 @@ user-login = "str4d"
 user-name = "Jack Grigg"
 
 [[publisher.zcash_protocol]]
-version = "0.2.0"
-when = "2024-08-19"
+version = "0.3.0"
+when = "2024-08-26"
 user-id = 169181
 user-login = "nuttycom"
 user-name = "Kris Nuttycombe"