diff --git a/crates/cli-support/Cargo.toml b/crates/cli-support/Cargo.toml
index e0da35675c9..6ad7dab8506 100644
--- a/crates/cli-support/Cargo.toml
+++ b/crates/cli-support/Cargo.toml
@@ -13,7 +13,7 @@ Shared support for the wasm-bindgen-cli package, an internal dependency
 [dependencies]
 base64 = "0.9"
 failure = "0.1.2"
-parity-wasm = "0.32"
+parity-wasm = "0.34"
 serde = "1.0"
 serde_json = "1.0"
 tempfile = "3.0"
diff --git a/crates/cli-support/src/lib.rs b/crates/cli-support/src/lib.rs
index 246e6e7b331..6b9fe6964e9 100644
--- a/crates/cli-support/src/lib.rs
+++ b/crates/cli-support/src/lib.rs
@@ -8,7 +8,6 @@ extern crate wasm_bindgen_gc;
 extern crate failure;
 extern crate wasm_bindgen_wasm_interpreter as wasm_interpreter;
 
-use std::any::Any;
 use std::collections::BTreeSet;
 use std::env;
 use std::fs;
@@ -40,7 +39,6 @@ pub struct Bindgen {
 
 enum Input {
     Path(PathBuf),
-    Bytes(Vec<u8>, String),
     Module(Module, String),
     None,
 }
@@ -68,33 +66,10 @@ impl Bindgen {
     }
 
     /// Explicitly specify the already parsed input module.
-    ///
-    /// Note that this API is a little wonky to avoid tying itself with a public
-    /// dependency on the `parity-wasm` crate, what we currently use to parse
-    /// wasm mdoules.
-    ///
-    /// If the `module` argument is a `parity_wasm::Module` then it will be used
-    /// directly. Otherwise it will be passed to `into_bytes` to serialize the
-    /// module to a vector of bytes, and this will deserialize the module later.
-    ///
-    /// Note that even if the argument passed in is a `parity_wasm::Module` it
-    /// doesn't mean that this won't invoke `into_bytes`, if the `parity_wasm`
-    /// crate versions are different we'll have to go through serialization.
-    pub fn input_module<T: Any>(
-        &mut self,
-        name: &str,
-        mut module: T,
-        into_bytes: impl FnOnce(T) -> Vec<u8>,
-    ) -> &mut Bindgen {
+    pub fn input_module(&mut self, name: &str, module: Module) -> &mut Bindgen {
         let name = name.to_string();
-        if let Some(module) = (&mut module as &mut Any).downcast_mut::<Module>() {
-            let blank = Module::new(Vec::new());
-            self.input = Input::Module(mem::replace(module, blank), name);
-            return self;
-        }
-
-        self.input = Input::Bytes(into_bytes(module), name);
-        self
+        self.input = Input::Module(module, name);
+        return self;
     }
 
     pub fn nodejs(&mut self, node: bool) -> &mut Bindgen {
@@ -153,11 +128,6 @@ impl Bindgen {
                 let blank_module = Module::new(Vec::new());
                 (mem::replace(m, blank_module), &name[..])
             }
-            Input::Bytes(ref b, ref name) => {
-                let module = parity_wasm::deserialize_buffer::<Module>(&b)
-                    .context("failed to parse input file as wasm")?;
-                (module, &name[..])
-            }
             Input::Path(ref path) => {
                 let contents = fs::read(&path)
                     .with_context(|_| format!("failed to read `{}`", path.display()))?;
diff --git a/crates/cli/Cargo.toml b/crates/cli/Cargo.toml
index c9fc84c5212..72ebf5f9f2b 100644
--- a/crates/cli/Cargo.toml
+++ b/crates/cli/Cargo.toml
@@ -18,7 +18,7 @@ docopt = "1.0"
 env_logger = "0.5"
 failure = "0.1.2"
 log = "0.4"
-parity-wasm = "0.32"
+parity-wasm = "0.34"
 rouille = { version = "2.1.0", default-features = false }
 serde = "1.0"
 serde_derive = "1.0"
diff --git a/crates/cli/src/bin/wasm-bindgen-test-runner/main.rs b/crates/cli/src/bin/wasm-bindgen-test-runner/main.rs
index bf1eaea611d..899a5666b18 100644
--- a/crates/cli/src/bin/wasm-bindgen-test-runner/main.rs
+++ b/crates/cli/src/bin/wasm-bindgen-test-runner/main.rs
@@ -126,7 +126,7 @@ fn rmain() -> Result<(), Error> {
     let mut b = Bindgen::new();
     b.debug(debug)
         .nodejs(node)
-        .input_module(module, wasm, |w| parity_wasm::serialize(w).unwrap())
+        .input_module(module, wasm)
         .keep_debug(false)
         .generate(&tmpdir)
         .context("executing `wasm-bindgen` over the wasm file")?;
diff --git a/crates/gc/Cargo.toml b/crates/gc/Cargo.toml
index 090d55311ac..6cd3a0c61c7 100644
--- a/crates/gc/Cargo.toml
+++ b/crates/gc/Cargo.toml
@@ -11,6 +11,6 @@ Support for removing unused items from a wasm executable
 """
 
 [dependencies]
-parity-wasm = "0.32"
+parity-wasm = "0.34"
 log = "0.4"
 rustc-demangle = "0.1.9"
diff --git a/crates/gc/src/lib.rs b/crates/gc/src/lib.rs
index cdf04e6b5a5..4c7ea0b2686 100644
--- a/crates/gc/src/lib.rs
+++ b/crates/gc/src/lib.rs
@@ -354,6 +354,7 @@ impl<'a> LiveContext<'a> {
             ValueType::I64 => {}
             ValueType::F32 => {}
             ValueType::F64 => {}
+            ValueType::V128 => {}
         }
     }
 
diff --git a/crates/wasm-interpreter/Cargo.toml b/crates/wasm-interpreter/Cargo.toml
index 4c5eb15b50a..0306a3b3442 100644
--- a/crates/wasm-interpreter/Cargo.toml
+++ b/crates/wasm-interpreter/Cargo.toml
@@ -11,7 +11,7 @@ Micro-interpreter optimized for wasm-bindgen's use case
 """
 
 [dependencies]
-parity-wasm = "0.32"
+parity-wasm = "0.34"
 
 [dev-dependencies]
 tempfile = "3"