diff --git a/Cargo.toml b/Cargo.toml
index 0a20876ef..66e85dd86 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -102,5 +102,5 @@ unused_must_use = "deny"
 
 [workspace.lints.clippy]
 # Clippy lints are documented here: https://rust-lang.github.io/rust-clippy/master/index.html
-indexing_slicing = "warn"
+indexing_slicing = "deny"
 missing_safety_doc = { level = "warn" }