diff --git a/Cargo.lock b/Cargo.lock
index c6320d360..501ece0f9 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1301,7 +1301,7 @@ dependencies = [
  "atty",
  "crucible-workspace-hack",
  "dropshot 0.17.0",
- "nix 0.31.1",
+ "nix 0.31.2",
  "rustls-pemfile 1.0.4",
  "schemars 0.8.22",
  "serde",
@@ -3316,7 +3316,7 @@ dependencies = [
  "libc",
  "percent-encoding",
  "pin-project-lite",
- "socket2 0.6.0",
+ "socket2 0.5.10",
  "system-configuration",
  "tokio",
  "tower-layer",
@@ -4020,9 +4020,9 @@ checksum = "09edd9e8b54e49e587e4f6295a7d29c3ea94d469cb40ab8ca70b288248a81db2"
 
 [[package]]
 name = "libc"
-version = "0.2.180"
+version = "0.2.185"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bcc35a38544a891a5f7c865aca548a982ccb3b8650a5b06d0fd33a10283c56fc"
+checksum = "52ff2c0fe9bc6cb6b14a0592c2ff4fa9ceb83eea9db979b0487cd054946a2b8f"
 
 [[package]]
 name = "libdlpi-sys"
@@ -4088,7 +4088,7 @@ dependencies = [
  "oxnet",
  "rand 0.9.2",
  "rusty-doors",
- "socket2 0.6.0",
+ "socket2 0.6.3",
  "thiserror 2.0.18",
  "tracing",
  "winnow 0.7.13",
@@ -4366,14 +4366,13 @@ dependencies = [
 
 [[package]]
 name = "mio"
-version = "1.0.2"
+version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "80e04d1dcff3aae0704555fe5fee3bcfaf3d1fdf8a7e521d5b9d2b42acb52cec"
+checksum = "50b7e5b27aa02a74bac8c3f23f448f8d87ff11f92d3aac1a6ed369ee08cc56c1"
 dependencies = [
- "hermit-abi 0.3.9",
  "libc",
  "wasi",
- "windows-sys 0.52.0",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]
@@ -4657,9 +4656,9 @@ dependencies = [
 
 [[package]]
 name = "nix"
-version = "0.31.1"
+version = "0.31.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "225e7cfe711e0ba79a68baeddb2982723e4235247aefce1482f2f16c27865b66"
+checksum = "5d6d0705320c1e6ba1d912b5e37cf18071b6c2e9b7fa8215a1e8a7651966f5d3"
 dependencies = [
  "bitflags 2.9.4",
  "cfg-if",
@@ -5291,11 +5290,12 @@ dependencies = [
 
 [[package]]
 name = "oxide-tokio-rt"
-version = "0.1.2"
+version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "84bd87abf37c68d414e4df90a545857542140e07206f75039b8f63b244da87b8"
+checksum = "f7d3e6073f692ff812f2d99b61e0ea7f503e54fc9ba44481f619c50a16f0565d"
 dependencies = [
  "anyhow",
+ "nix 0.31.2",
  "tokio",
  "tokio-dtrace",
 ]
@@ -5583,7 +5583,7 @@ dependencies = [
 [[package]]
 name = "p4rs"
 version = "0.1.0"
-source = "git+https://github.com/oxidecomputer/p4?branch=main#33d646041f13062cc39c6f38725d8c95d4024a2f"
+source = "git+https://github.com/oxidecomputer/p4?branch=zl/multicast#0e8a28a2edce0a96dd0ac3a3df95af3d58cee839"
 dependencies = [
  "bitvec",
  "num",
@@ -6438,7 +6438,7 @@ dependencies = [
  "libc",
  "libloading 0.7.4",
  "nexus-client",
- "nix 0.31.1",
+ "nix 0.31.2",
  "oximeter",
  "p9ds",
  "paste",
@@ -6858,7 +6858,7 @@ dependencies = [
  "quinn-udp",
  "rustc-hash 2.1.1",
  "rustls 0.23.31",
- "socket2 0.6.0",
+ "socket2 0.5.10",
  "thiserror 2.0.18",
  "tokio",
  "tracing",
@@ -8446,7 +8446,7 @@ version = "0.8.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c1c97747dbf44bb1ca44a561ece23508e99cb592e862f22222dcf42f51d1e451"
 dependencies = [
- "heck 0.4.1",
+ "heck 0.5.0",
  "proc-macro2",
  "quote",
  "syn 2.0.117",
@@ -8464,18 +8464,18 @@ dependencies = [
 
 [[package]]
 name = "socket2"
-version = "0.6.0"
+version = "0.6.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "233504af464074f9d066d7b5416c5f9b894a5862a6506e306f7b816cdd6f1807"
+checksum = "3a766e1110788c36f4fa1c2b71b387a7815aa65f88ce0229841826633d93723e"
 dependencies = [
  "libc",
- "windows-sys 0.59.0",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]
 name = "softnpu"
 version = "0.2.0"
-source = "git+https://github.com/oxidecomputer/softnpu#3828225fd5719dc985a300e36850d25a0405eba6"
+source = "git+https://github.com/oxidecomputer/softnpu?branch=zl/multicast#284c6830722548714128e63ea04bcca78ee27154"
 dependencies = [
  "p4rs",
  "serde",
@@ -9102,9 +9102,9 @@ dependencies = [
 
 [[package]]
 name = "tokio"
-version = "1.50.0"
+version = "1.52.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "27ad5e34374e03cfffefc301becb44e9dc3c17584f414349ebe29ed26661822d"
+checksum = "b67dee974fe86fd92cc45b7a95fdd2f99a36a6d7b0d431a231178d3d670bbcc6"
 dependencies = [
  "bytes",
  "libc",
@@ -9112,7 +9112,7 @@ dependencies = [
  "parking_lot",
  "pin-project-lite",
  "signal-hook-registry",
- "socket2 0.6.0",
+ "socket2 0.6.3",
  "tokio-macros",
  "windows-sys 0.61.2",
 ]
@@ -9130,9 +9130,9 @@ dependencies = [
 
 [[package]]
 name = "tokio-macros"
-version = "2.6.0"
+version = "2.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "af407857209536a95c8e56f8231ef2c2e2aff839b22e07a1ffcbc617e9db9fa5"
+checksum = "385a6cb71ab9ab790c5fe8d67f1645e6c450a7ce006a33de03daa956cf70a496"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/Cargo.toml b/Cargo.toml
index 55eede753..87f38805e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -78,7 +78,7 @@ dlpi = { git = "https://github.com/oxidecomputer/dlpi-sys", branch = "main" }
 ispf = { git = "https://github.com/oxidecomputer/ispf" }
 libloading = "0.7"
 p9ds = { git = "https://github.com/oxidecomputer/p9fs" }
-softnpu = { git = "https://github.com/oxidecomputer/softnpu" }
+softnpu = { git = "https://github.com/oxidecomputer/softnpu", branch = "zl/multicast" }
 
 # Omicron-related
 internal-dns-resolver = { git = "https://github.com/oxidecomputer/omicron", branch = "main" }
@@ -147,7 +147,7 @@ newtype_derive = "0.1.6"
 newtype-uuid = { version = "1.0.1", features = [ "v4" ] }
 nix = { version = "0.31", features = [ "poll" ] }
 owo-colors = "4"
-oxide-tokio-rt = "0.1.2"
+oxide-tokio-rt = "0.1.4"
 paste = "1.0.15"
 pin-project-lite = "0.2.13"
 proc-macro2 = "1.0"