diff --git a/.gitmodules b/.gitmodules
index 6ebb2c5e..9eab60ca 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -13,4 +13,4 @@
 [submodule "lib/risc0"]
 	path = lib/risc0
 	url = https://github.com/risc0/risc0
-	branch = parker/bonsai-snark-types
+	rev = "4652f9c"
diff --git a/Cargo.lock b/Cargo.lock
index 06b4d94c..ce171a2b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -406,7 +406,7 @@ dependencies = [
 [[package]]
 name = "bonsai-ethereum-contracts"
 version = "0.1.0"
-source = "git+https://github.com/risc0/risc0?branch=release-0.18#29cc16f84e1f5f2af34120528b1f18a33e00ce71"
+source = "git+https://github.com/risc0/risc0?rev=4652f9c#4652f9c4333dff162743911a67a5103f01ded5dc"
 dependencies = [
  "anyhow",
  "ethers",
@@ -415,7 +415,7 @@ dependencies = [
 [[package]]
 name = "bonsai-ethereum-relay"
 version = "0.1.0"
-source = "git+https://github.com/risc0/risc0?branch=release-0.18#29cc16f84e1f5f2af34120528b1f18a33e00ce71"
+source = "git+https://github.com/risc0/risc0?rev=4652f9c#4652f9c4333dff162743911a67a5103f01ded5dc"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -474,7 +474,7 @@ dependencies = [
 [[package]]
 name = "bonsai-rest-api-mock"
 version = "0.1.0"
-source = "git+https://github.com/risc0/risc0?branch=release-0.18#29cc16f84e1f5f2af34120528b1f18a33e00ce71"
+source = "git+https://github.com/risc0/risc0?rev=4652f9c#4652f9c4333dff162743911a67a5103f01ded5dc"
 dependencies = [
  "anyhow",
  "axum",
@@ -498,7 +498,7 @@ dependencies = [
 [[package]]
 name = "bonsai-sdk"
 version = "0.4.0"
-source = "git+https://github.com/risc0/risc0?branch=release-0.18#29cc16f84e1f5f2af34120528b1f18a33e00ce71"
+source = "git+https://github.com/risc0/risc0?rev=4652f9c#4652f9c4333dff162743911a67a5103f01ded5dc"
 dependencies = [
  "reqwest",
  "serde",
@@ -3266,7 +3266,7 @@ dependencies = [
 [[package]]
 name = "risc0-binfmt"
 version = "0.18.0"
-source = "git+https://github.com/risc0/risc0?branch=release-0.18#29cc16f84e1f5f2af34120528b1f18a33e00ce71"
+source = "git+https://github.com/risc0/risc0?rev=4652f9c#4652f9c4333dff162743911a67a5103f01ded5dc"
 dependencies = [
  "anyhow",
  "elf",
@@ -3279,7 +3279,7 @@ dependencies = [
 [[package]]
 name = "risc0-build"
 version = "0.18.0"
-source = "git+https://github.com/risc0/risc0?branch=release-0.18#29cc16f84e1f5f2af34120528b1f18a33e00ce71"
+source = "git+https://github.com/risc0/risc0?rev=4652f9c#4652f9c4333dff162743911a67a5103f01ded5dc"
 dependencies = [
  "cargo_metadata 0.17.0",
  "risc0-binfmt",
@@ -3292,7 +3292,7 @@ dependencies = [
 [[package]]
 name = "risc0-build-kernel"
 version = "0.18.0"
-source = "git+https://github.com/risc0/risc0?branch=release-0.18#29cc16f84e1f5f2af34120528b1f18a33e00ce71"
+source = "git+https://github.com/risc0/risc0?rev=4652f9c#4652f9c4333dff162743911a67a5103f01ded5dc"
 dependencies = [
  "cc",
  "directories",
@@ -3305,7 +3305,7 @@ dependencies = [
 [[package]]
 name = "risc0-circuit-rv32im"
 version = "0.18.0"
-source = "git+https://github.com/risc0/risc0?branch=release-0.18#29cc16f84e1f5f2af34120528b1f18a33e00ce71"
+source = "git+https://github.com/risc0/risc0?rev=4652f9c#4652f9c4333dff162743911a67a5103f01ded5dc"
 dependencies = [
  "anyhow",
  "log",
@@ -3322,7 +3322,7 @@ dependencies = [
 [[package]]
 name = "risc0-circuit-rv32im-sys"
 version = "0.18.0"
-source = "git+https://github.com/risc0/risc0?branch=release-0.18#29cc16f84e1f5f2af34120528b1f18a33e00ce71"
+source = "git+https://github.com/risc0/risc0?rev=4652f9c#4652f9c4333dff162743911a67a5103f01ded5dc"
 dependencies = [
  "glob",
  "risc0-build-kernel",
@@ -3333,7 +3333,7 @@ dependencies = [
 [[package]]
 name = "risc0-core"
 version = "0.18.0"
-source = "git+https://github.com/risc0/risc0?branch=release-0.18#29cc16f84e1f5f2af34120528b1f18a33e00ce71"
+source = "git+https://github.com/risc0/risc0?rev=4652f9c#4652f9c4333dff162743911a67a5103f01ded5dc"
 dependencies = [
  "bytemuck",
  "rand_core",
@@ -3342,7 +3342,7 @@ dependencies = [
 [[package]]
 name = "risc0-sys"
 version = "0.18.0"
-source = "git+https://github.com/risc0/risc0?branch=release-0.18#29cc16f84e1f5f2af34120528b1f18a33e00ce71"
+source = "git+https://github.com/risc0/risc0?rev=4652f9c#4652f9c4333dff162743911a67a5103f01ded5dc"
 dependencies = [
  "cc",
  "glob",
@@ -3353,7 +3353,7 @@ dependencies = [
 [[package]]
 name = "risc0-zkp"
 version = "0.18.0"
-source = "git+https://github.com/risc0/risc0?branch=release-0.18#29cc16f84e1f5f2af34120528b1f18a33e00ce71"
+source = "git+https://github.com/risc0/risc0?rev=4652f9c#4652f9c4333dff162743911a67a5103f01ded5dc"
 dependencies = [
  "anyhow",
  "blake2",
@@ -3379,7 +3379,7 @@ dependencies = [
 [[package]]
 name = "risc0-zkvm"
 version = "0.18.0"
-source = "git+https://github.com/risc0/risc0?branch=release-0.18#29cc16f84e1f5f2af34120528b1f18a33e00ce71"
+source = "git+https://github.com/risc0/risc0?rev=4652f9c#4652f9c4333dff162743911a67a5103f01ded5dc"
 dependencies = [
  "addr2line",
  "anyhow",
@@ -3419,7 +3419,7 @@ dependencies = [
 [[package]]
 name = "risc0-zkvm-platform"
 version = "0.18.0"
-source = "git+https://github.com/risc0/risc0?branch=release-0.18#29cc16f84e1f5f2af34120528b1f18a33e00ce71"
+source = "git+https://github.com/risc0/risc0?rev=4652f9c#4652f9c4333dff162743911a67a5103f01ded5dc"
 
 [[package]]
 name = "rlp"
diff --git a/Cargo.toml b/Cargo.toml
index 4a10035d..59af558c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,10 +3,10 @@ members = ["methods", "relay"]
 resolver = "2"
 
 [workspace.dependencies]
-risc0-build = { git = "https://github.com/risc0/risc0", branch = "release-0.18" }
-risc0-zkvm = { git = "https://github.com/risc0/risc0", branch = "release-0.18", default-features = false }
-bonsai-sdk = { git = "https://github.com/risc0/risc0", branch = "release-0.18" }
-bonsai-ethereum-relay = { git = "https://github.com/risc0/risc0", branch = "release-0.18" }
+risc0-build = { git = "https://github.com/risc0/risc0", rev = "4652f9c" }
+risc0-zkvm = { git = "https://github.com/risc0/risc0", rev = "4652f9c", default-features = false }
+bonsai-sdk = { git = "https://github.com/risc0/risc0", rev = "4652f9c" }
+bonsai-ethereum-relay = { git = "https://github.com/risc0/risc0", rev = "4652f9c" }
 methods = { path = "./methods", package = "bonsai-starter-methods" }
 
 # Always optimize; building and running the guest takes much longer without optimization.
diff --git a/lib/risc0 b/lib/risc0
index 29cc16f8..4652f9c4 160000
--- a/lib/risc0
+++ b/lib/risc0
@@ -1 +1 @@
-Subproject commit 29cc16f84e1f5f2af34120528b1f18a33e00ce71
+Subproject commit 4652f9c4333dff162743911a67a5103f01ded5dc