diff --git a/canister/src/validate/mod.rs b/canister/src/validate/mod.rs
index c501b67e..84340c7d 100644
--- a/canister/src/validate/mod.rs
+++ b/canister/src/validate/mod.rs
@@ -10,7 +10,7 @@ const API_KEY_TOO_LONG_ERROR_MESSAGE: &str =
 pub fn validate_api_key(api_key: &str) -> Result<(), &'static str> {
     if api_key.is_empty() {
         Err("API key must not be an empty string")
-    } else if api_key.as_bytes().len() > API_KEY_MAX_SIZE {
+    } else if api_key.len() > API_KEY_MAX_SIZE {
         Err(API_KEY_TOO_LONG_ERROR_MESSAGE)
     } else if api_key
         .chars()
diff --git a/integration_tests/src/lib.rs b/integration_tests/src/lib.rs
index d4240f19..c3be8e81 100644
--- a/integration_tests/src/lib.rs
+++ b/integration_tests/src/lib.rs
@@ -115,7 +115,7 @@ pub struct PocketIcRuntime<'a> {
 }
 
 #[async_trait]
-impl<'a> Runtime for PocketIcRuntime<'a> {
+impl Runtime for PocketIcRuntime<'_> {
     async fn update_call<In, Out>(
         &self,
         id: Principal,
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index bd4541d2..bcb3be24 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,4 +1,4 @@
 [toolchain]
-channel = "1.81.0"
+channel = "1.85.0"
 components = ["rustfmt", "clippy"]
 targets = ["wasm32-unknown-unknown"]