diff --git a/Cargo.lock b/Cargo.lock
index 6819499..5146a45 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2222,7 +2222,7 @@ checksum = "9985c9503b412198aa4197559e9a318524ebc4519c229bfa05a535828c950b9d"
 
 [[package]]
 name = "grin_api"
-version = "5.5.1"
+version = "5.5.1-alpha.0"
 dependencies = [
  "bytes 1.12.0",
  "easy-jsonrpc-mw",
@@ -2254,7 +2254,7 @@ dependencies = [
 
 [[package]]
 name = "grin_chain"
-version = "5.5.1"
+version = "5.5.1-alpha.0"
 dependencies = [
  "bit-vec",
  "bitflags 1.3.2",
@@ -2278,7 +2278,7 @@ dependencies = [
 
 [[package]]
 name = "grin_core"
-version = "5.5.1"
+version = "5.5.1-alpha.0"
 dependencies = [
  "blake2-rfc",
  "byteorder",
@@ -2304,7 +2304,7 @@ dependencies = [
 
 [[package]]
 name = "grin_keychain"
-version = "5.5.1"
+version = "5.5.1-alpha.0"
 dependencies = [
  "blake2-rfc",
  "byteorder",
@@ -2325,7 +2325,7 @@ dependencies = [
 
 [[package]]
 name = "grin_p2p"
-version = "5.5.1"
+version = "5.5.1-alpha.0"
 dependencies = [
  "bitflags 1.3.2",
  "built",
@@ -2348,7 +2348,7 @@ dependencies = [
 
 [[package]]
 name = "grin_pool"
-version = "5.5.1"
+version = "5.5.1-alpha.0"
 dependencies = [
  "blake2-rfc",
  "chrono",
@@ -2380,7 +2380,7 @@ dependencies = [
 
 [[package]]
 name = "grin_store"
-version = "5.5.1"
+version = "5.5.1-alpha.0"
 dependencies = [
  "byteorder",
  "chrono",
@@ -2402,7 +2402,7 @@ dependencies = [
 
 [[package]]
 name = "grin_util"
-version = "5.5.1"
+version = "5.5.1-alpha.0"
 dependencies = [
  "anyhow",
  "backtrace",
diff --git a/grin b/grin
index d5f3235..e42e0c4 160000
--- a/grin
+++ b/grin
@@ -1 +1 @@
-Subproject commit d5f32350ab548736c17c1db7ff51457917fe4e96
+Subproject commit e42e0c4a9ead332545fc91fca21df2c99ada4e9e
diff --git a/libwallet/src/contract/actions/README.md b/libwallet/src/contract/actions/README.md
index 0deffb3..29d1b58 100644
--- a/libwallet/src/contract/actions/README.md
+++ b/libwallet/src/contract/actions/README.md
@@ -43,7 +43,6 @@ without a user confirmation step.
    races a transaction already in the mempool.
  - Add a Grin node API for kernel lookup by MMR index, then use the witness index instead
    of searching by commitment.
- - Expose the kernel feature constants from `grin_core` and reuse them here.
  - Add compact Slatepack support for contracts
  - Keep Slate V5 experimental until the related RFCs are accepted
  - Add contract history, lookup and transport.
diff --git a/libwallet/src/slate_versions/mod.rs b/libwallet/src/slate_versions/mod.rs
index fc2f4e1..8d3d099 100644
--- a/libwallet/src/slate_versions/mod.rs
+++ b/libwallet/src/slate_versions/mod.rs
@@ -17,6 +17,7 @@
 //! Versions earlier than V3 are removed for the 4.0.0 release, but versioning code
 //! remains for future needs
 
+use crate::grin_core::core::transaction::KernelFeatures;
 use crate::slate::Slate;
 use crate::slate_versions::v4::{CoinbaseV4, SlateV4};
 use crate::slate_versions::v4_bin::SlateV4Bin;
@@ -44,11 +45,11 @@ pub const CURRENT_SLATE_VERSION: u16 = 5;
 /// The latest grin block header version this wallet supports
 pub const GRIN_BLOCK_HEADER_VERSION: u16 = 5;
 
-const HEIGHT_LOCKED_FEATURE: u8 = 2;
-const NRD_FEATURE: u8 = 3;
-
 fn kernel_has_height_arg(feature: u8) -> bool {
-	matches!(feature, HEIGHT_LOCKED_FEATURE | NRD_FEATURE)
+	matches!(
+		feature,
+		KernelFeatures::HEIGHT_LOCKED_U8 | KernelFeatures::NO_RECENT_DUPLICATE_U8
+	)
 }
 
 /// Existing versions of the slate
@@ -185,7 +186,6 @@ impl VersionedCoinbase {
 /// Shared slate fixtures, used by the version conversion tests
 #[cfg(test)]
 pub mod tests {
-	use super::HEIGHT_LOCKED_FEATURE;
 	use crate::grin_core::core::transaction::{KernelFeatures, NRDRelativeHeight, OutputFeatures};
 	use crate::grin_core::core::FeeFields;
 	use crate::grin_util::from_hex;
@@ -291,7 +291,7 @@ pub mod tests {
 
 		// basic fields
 		slate_internal.amount = 23820323;
-		slate_internal.kernel_features = HEIGHT_LOCKED_FEATURE;
+		slate_internal.kernel_features = KernelFeatures::HEIGHT_LOCKED_U8;
 		slate_internal.num_participants = 3;
 		slate_internal.fee_fields = FeeFields::new(0, 42)?;
 		slate_internal.ttl_cutoff_height = 100;