diff --git a/src/flags.rs b/src/flags.rs
index dab95ad..4cb8671 100644
--- a/src/flags.rs
+++ b/src/flags.rs
@@ -221,13 +221,12 @@ static DEFAULT_RUSTFLAGS: &[&[&str]] = &[
         "-Zcrate-attr=feature(coroutine_clone)",
         "-Zcrate-attr=feature(gen_blocks)",
         "-Zthir-unsafeck=yes",
-        "-Zcrate-attr=feature(trait_upcasting)",
         "-Zcross-crate-inline-threshold=always",
         "-Zinline-mir-hint-threshold=20",
         "-Zinline-mir-threshold=20",
         "-Zcrate-attr=feature(fn_delegation)",
         "-Zcrate-attr=feature(unnamed_fields)",
-        "-Zcrate-attr=feature(never_pattern)",
+        "-Zcrate-attr=feature(never_patterns)",
         // need codegen
         "-Zcodegen-backend=cranelift",
         "-ocodegen",
@@ -656,7 +655,6 @@ static EXPENSIVE_RUSTFLAGS: &[&[&str]] = &[
         "-Zcrate-attr=feature(target_feature_11)",
         "-Zcrate-attr=feature(thread_local)",
         "-Zcrate-attr=feature(trait_alias)",
-        "-Zcrate-attr=feature(trait_upcasting)",
         "-Zcrate-attr=feature(transmutability)",
         "-Zcrate-attr=feature(transparent_unions)",
         "-Zcrate-attr=feature(trivial_bounds)",