diff --git a/lib/codegen/src/lib.rs b/lib/codegen/src/lib.rs
index ec924dc6bf..24c381a6eb 100644
--- a/lib/codegen/src/lib.rs
+++ b/lib/codegen/src/lib.rs
@@ -48,6 +48,8 @@
 // Turns on no_std and alloc features if std is not available.
 #![cfg_attr(not(feature = "std"), no_std)]
 #![cfg_attr(not(feature = "std"), feature(alloc))]
+// TODO: Remove this workaround once https://github.com/rust-lang/rust/issues/27747 is done.
+#![cfg_attr(not(feature = "std"), feature(slice_concat_ext))]
 
 #[cfg(not(feature = "std"))]
 #[macro_use]
@@ -119,7 +121,7 @@ pub use result::{CodegenError, CodegenResult};
 /// This replaces `std` in builds with `core`.
 #[cfg(not(feature = "std"))]
 mod std {
-    pub use alloc::{boxed, string, vec};
+    pub use alloc::{boxed, slice, string, vec};
     pub use core::*;
     pub mod collections {
         #[allow(unused_extern_crates)]
diff --git a/lib/codegen/src/settings.rs b/lib/codegen/src/settings.rs
index 3f7d684a87..cd135eba4b 100644
--- a/lib/codegen/src/settings.rs
+++ b/lib/codegen/src/settings.rs
@@ -25,6 +25,11 @@ use isa::TargetIsa;
 use std::boxed::Box;
 use std::fmt;
 use std::str;
+use std::string::{String, ToString};
+
+// TODO: Remove this workaround once https://github.com/rust-lang/rust/issues/27747 is done.
+#[cfg(not(feature = "std"))]
+use std::slice::SliceConcatExt;
 
 /// A string-based configurator for settings groups.
 ///
diff --git a/lib/wasm/Cargo.toml b/lib/wasm/Cargo.toml
index 2469716d3c..d298060f76 100644
--- a/lib/wasm/Cargo.toml
+++ b/lib/wasm/Cargo.toml
@@ -10,7 +10,7 @@ readme = "README.md"
 keywords = ["webassembly", "wasm"]
 
 [dependencies]
-wasmparser = { version = "0.19.0", default-features = false }
+wasmparser = { version = "0.19.1", default-features = false }
 cranelift-codegen = { path = "../codegen", version = "0.22.0", default-features = false }
 cranelift-entity = { path = "../entity", version = "0.22.0", default-features = false }
 cranelift-frontend = { path = "../frontend", version = "0.22.0", default-features = false }