diff --git a/crates/l2/Cargo.toml b/crates/l2/Cargo.toml
index 9194d5a569..1be80ccc19 100644
--- a/crates/l2/Cargo.toml
+++ b/crates/l2/Cargo.toml
@@ -42,3 +42,4 @@ path = "./l2.rs"
 [lints.clippy]
 unwrap_used = "deny"
 expect_used = "deny"
+indexing_slicing = "deny"
diff --git a/crates/l2/contracts/Cargo.toml b/crates/l2/contracts/Cargo.toml
index 022a3ab50d..f35455bf8e 100644
--- a/crates/l2/contracts/Cargo.toml
+++ b/crates/l2/contracts/Cargo.toml
@@ -28,3 +28,4 @@ path = "./deployer.rs"
 [lints.clippy]
 unwrap_used = "deny"
 expect_used = "deny"
+indexing_slicing = "deny"
diff --git a/crates/l2/prover/Cargo.toml b/crates/l2/prover/Cargo.toml
index ec9d06c9b0..2b2616b4c7 100644
--- a/crates/l2/prover/Cargo.toml
+++ b/crates/l2/prover/Cargo.toml
@@ -54,3 +54,4 @@ gpu = ["risc0-zkvm/cuda"]
 [lints.clippy]
 unwrap_used = "deny"
 expect_used = "deny"
+indexing_slicing = "deny"
diff --git a/crates/l2/sdk/Cargo.toml b/crates/l2/sdk/Cargo.toml
index a23c311ce3..ee16463f1e 100644
--- a/crates/l2/sdk/Cargo.toml
+++ b/crates/l2/sdk/Cargo.toml
@@ -23,3 +23,4 @@ path = "src/sdk.rs"
 [lints.clippy]
 unwrap_used = "deny"
 expect_used = "deny"
+indexing_slicing = "deny"