diff --git a/Cargo.toml b/Cargo.toml
index 01bfaf58ac..6ad3f8b669 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -37,7 +37,7 @@ wabt = "0.9"
 libc = "0.2.60"
 errno = "0.2.4"
 rayon = "1.1"
-wasm-webidl-bindings = "0.4"
+wasm-webidl-bindings = "0.5"
 
 # build.rs tests whether to enable a workaround for the libc strtof function.
 [target.'cfg(target_os = "linux")'.build-dependencies]
diff --git a/fuzz/Cargo.toml b/fuzz/Cargo.toml
index 2b56dd6c3a..59095b8006 100644
--- a/fuzz/Cargo.toml
+++ b/fuzz/Cargo.toml
@@ -15,7 +15,7 @@ cranelift-codegen = { version = "0.44.0", features = ["enable-serde"] }
 cranelift-wasm = { version = "0.44.0", features = ["enable-serde"] }
 cranelift-native = "0.44.0"
 libfuzzer-sys = { git = "https://github.com/rust-fuzz/libfuzzer-sys.git" }
-wasmparser = { version = "0.36.0", default-features = false }
+wasmparser = { version = "0.39.1", default-features = false }
 binaryen = "0.5.0"
 
 [features]
diff --git a/wasmtime-api/Cargo.toml b/wasmtime-api/Cargo.toml
index a401252b6b..ff804bddac 100644
--- a/wasmtime-api/Cargo.toml
+++ b/wasmtime-api/Cargo.toml
@@ -20,7 +20,7 @@ cranelift-frontend = "0.44.0"
 wasmtime-runtime = { path="../wasmtime-runtime" }
 wasmtime-environ = { path="../wasmtime-environ" }
 wasmtime-jit = { path="../wasmtime-jit" }
-wasmparser = "0.36"
+wasmparser = "0.39.1"
 failure = { version = "0.1.3", default-features = false }
 failure_derive = { version = "0.1.3", default-features = false }
 target-lexicon = { version = "0.8.1", default-features = false }
diff --git a/wasmtime-api/src/module.rs b/wasmtime-api/src/module.rs
index 2383c2fb1a..436aa8a146 100644
--- a/wasmtime-api/src/module.rs
+++ b/wasmtime-api/src/module.rs
@@ -189,7 +189,7 @@ impl Module {
         &self.binary
     }
     pub fn validate(_store: &Store, binary: &[u8]) -> bool {
-        validate(binary, None)
+        validate(binary, None).is_ok()
     }
     pub fn imports(&self) -> &[ImportType] {
         &self.imports
diff --git a/wasmtime-debug/Cargo.toml b/wasmtime-debug/Cargo.toml
index e5aaf1a1c3..6bc77fcdcb 100644
--- a/wasmtime-debug/Cargo.toml
+++ b/wasmtime-debug/Cargo.toml
@@ -13,7 +13,7 @@ edition = "2018"
 
 [dependencies]
 gimli = "0.19.0"
-wasmparser = { version = "0.36.0" }
+wasmparser = { version = "0.39.1" }
 cranelift-codegen = { version = "0.44.0", features = ["enable-serde"] }
 cranelift-entity = { version = "0.44.0", features = ["enable-serde"] }
 cranelift-wasm = { version = "0.44.0", features = ["enable-serde"] }
diff --git a/wasmtime-interface-types/Cargo.toml b/wasmtime-interface-types/Cargo.toml
index e14d972eff..5bea175d3b 100644
--- a/wasmtime-interface-types/Cargo.toml
+++ b/wasmtime-interface-types/Cargo.toml
@@ -13,8 +13,8 @@ edition = "2018"
 [dependencies]
 cranelift-codegen = "0.44.0"
 failure = "0.1"
-walrus = "0.11.0"
-wasmparser = "0.36.0"
-wasm-webidl-bindings = "0.4.0"
+walrus = "0.12.0"
+wasmparser = "0.39.1"
+wasm-webidl-bindings = "0.5.0"
 wasmtime-jit = { path = '../wasmtime-jit' }
 wasmtime-runtime = { path = '../wasmtime-runtime' }
diff --git a/wasmtime-jit/Cargo.toml b/wasmtime-jit/Cargo.toml
index b7c173cf93..2b000a0fad 100644
--- a/wasmtime-jit/Cargo.toml
+++ b/wasmtime-jit/Cargo.toml
@@ -23,7 +23,7 @@ failure = { version = "0.1.3", default-features = false }
 failure_derive = { version = "0.1.3", default-features = false }
 target-lexicon = { version = "0.8.1", default-features = false }
 hashbrown = { version = "0.6.0", optional = true }
-wasmparser = "0.36.0"
+wasmparser = "0.39.1"
 
 [features]
 default = ["std"]
diff --git a/wasmtime-jit/src/context.rs b/wasmtime-jit/src/context.rs
index b04dd5d7a5..144f066e75 100644
--- a/wasmtime-jit/src/context.rs
+++ b/wasmtime-jit/src/context.rs
@@ -4,7 +4,6 @@ use crate::{
     SetupError,
 };
 use cranelift_codegen::isa::TargetIsa;
-use std::borrow::ToOwned;
 use std::boxed::Box;
 use std::cell::RefCell;
 use std::collections::HashMap;
@@ -116,12 +115,8 @@ impl Context {
     fn validate(&mut self, data: &[u8]) -> Result<(), String> {
         // TODO: Fix Cranelift to be able to perform validation itself, rather
         // than calling into wasmparser ourselves here.
-        if validate(data, Some(self.features.clone().into())) {
-            Ok(())
-        } else {
-            // TODO: Work with wasmparser to get better error messages.
-            Err("module did not validate".to_owned())
-        }
+        validate(data, Some(self.features.clone().into()))
+            .map_err(|e| format!("module did not validate: {}", e.to_string()))
     }
 
     fn instantiate(&mut self, data: &[u8]) -> Result<InstanceHandle, SetupError> {