diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 05e6ca1..fdda5b9 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,4 +1,4 @@
 [toolchain]
-channel = "stable"
+channel = "1.88.0"
 profile = "minimal"
 components = ["rustfmt", "clippy"]
diff --git a/src/cache.rs b/src/cache.rs
index fcd6f36..82332e5 100644
--- a/src/cache.rs
+++ b/src/cache.rs
@@ -3774,9 +3774,10 @@ mod tests {
                 .unwrap(),
         );
         h.insert("age", HeaderValue::from_static("3"));
-        let plan = plan(StatusCode::OK, &h, &settings, Duration::from_millis(250)).unwrap();
-        assert!(plan.initial_age >= Duration::from_secs(10));
-        assert!(plan.initial_age < Duration::from_secs(12));
+        let cache_plan =
+            plan(StatusCode::OK, &h, &settings, Duration::from_millis(250)).unwrap();
+        assert!(cache_plan.initial_age >= Duration::from_secs(10));
+        assert!(cache_plan.initial_age < Duration::from_secs(12));
         let fresh = plan(
             StatusCode::OK,
             &headers("max-age=60"),
diff --git a/src/proxy/websocket.rs b/src/proxy/websocket.rs
index a25776e..c1d3519 100644
--- a/src/proxy/websocket.rs
+++ b/src/proxy/websocket.rs
@@ -653,7 +653,11 @@ mod tests {
             .unwrap();
         request
             .extensions_mut()
-            .insert("websocket".parse::<h3::ext::Protocol>().unwrap());
+            .insert(
+                "websocket"
+                    .parse::<h3::ext::Protocol>()
+                    .unwrap_or_else(|_| panic!("websocket is a valid HTTP/3 protocol token")),
+            );
         request
     }
     #[test]
@@ -702,7 +706,11 @@ mod tests {
         let mut request = h3_request();
         request
             .extensions_mut()
-            .insert("connect-udp".parse::<h3::ext::Protocol>().unwrap());
+            .insert(
+                "connect-udp"
+                    .parse::<h3::ext::Protocol>()
+                    .unwrap_or_else(|_| panic!("connect-udp is a valid HTTP/3 protocol token")),
+            );
         assert!(validate_h3(&request).is_err());
     }
     #[test]
diff --git a/tests/http3.rs b/tests/http3.rs
index c5990bc..6f775ea 100644
--- a/tests/http3.rs
+++ b/tests/http3.rs
@@ -14,7 +14,11 @@ fn rfc9220_extended_connect_is_recognized() {
         .unwrap();
     request
         .extensions_mut()
-        .insert("websocket".parse::<h3::ext::Protocol>().unwrap());
+        .insert(
+            "websocket"
+                .parse::<h3::ext::Protocol>()
+                .unwrap_or_else(|_| panic!("websocket is a valid HTTP/3 protocol token")),
+        );
 
     assert_eq!(h3_protocol(&request), Some("websocket"));
     let handshake = validate_h3(&request).expect("valid RFC 9220 bootstrap");