diff --git a/guests/reth-ethereum/Cargo.toml b/guests/reth-ethereum/Cargo.toml
index 996ed4c4..2102f264 100644
--- a/guests/reth-ethereum/Cargo.toml
+++ b/guests/reth-ethereum/Cargo.toml
@@ -5,6 +5,15 @@ edition = "2021"
 
 [workspace]
 
+[profile.release]
+codegen-units = 1
+debug = 1
+lto = "fat"
+
+[profile.release.build-override]
+codegen-units = 1
+opt-level = 3
+
 [dependencies.risc0-zkvm]
 git = "https://github.com/risc0/risc0"
 rev = "e98cdad96cfecb3d959cb62abf566e5b17a0d649"
diff --git a/guests/reth-optimism/Cargo.toml b/guests/reth-optimism/Cargo.toml
index 90a67309..29ba809d 100644
--- a/guests/reth-optimism/Cargo.toml
+++ b/guests/reth-optimism/Cargo.toml
@@ -5,6 +5,15 @@ edition = "2021"
 
 [workspace]
 
+[profile.release]
+codegen-units = 1
+debug = 1
+lto = "fat"
+
+[profile.release.build-override]
+codegen-units = 1
+opt-level = 3
+
 [dependencies.risc0-zkvm]
 git = "https://github.com/risc0/risc0"
 rev = "e98cdad96cfecb3d959cb62abf566e5b17a0d649"