diff --git a/Cargo.lock b/Cargo.lock
index f27ca95b5..dd25f6ccd 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -540,9 +540,9 @@ dependencies = [
 
 [[package]]
 name = "convert_case"
-version = "0.11.0"
+version = "0.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "affbf0190ed2caf063e3def54ff444b449371d55c58e513a95ab98eca50adb49"
+checksum = "1af709f1f33454bf52eadfc8c78b3b9ef9cb26fb54d16dc9cd9a7299f899fd1b"
 dependencies = [
  "unicode-segmentation",
 ]
@@ -1585,12 +1585,6 @@ version = "2.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3d3067d79b975e8844ca9eb072e16b31c3c1c36928edf9c6789548c524d0d954"
 
-[[package]]
-name = "ident_case"
-version = "1.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b9e0384b61958566e926dc50660321d12159025e767c18e043daf26b70104c39"
-
 [[package]]
 name = "idna"
 version = "1.1.0"
@@ -1755,7 +1749,7 @@ dependencies = [
 
 [[package]]
 name = "javy"
-version = "8.1.1-alpha.1"
+version = "9.0.0-alpha.1"
 dependencies = [
  "anyhow",
  "bitflags",
@@ -1838,7 +1832,7 @@ dependencies = [
 
 [[package]]
 name = "javy-plugin-api"
-version = "7.1.1-alpha.1"
+version = "8.0.0-alpha.1"
 dependencies = [
  "anyhow",
  "javy",
@@ -2673,9 +2667,9 @@ checksum = "88f8660c1ff60292143c98d08fc6e2f654d722db50410e3f3797d40baaf9d8f3"
 
 [[package]]
 name = "rquickjs"
-version = "0.12.2"
+version = "0.14.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4e04e4eedfb060b503b5f0a2644abb890b0b3620d3fb674f9455f230014964e4"
+checksum = "a0a22bf72f515cc4189dd7c63d016f6de92a11eee98ddf7dd64794198f6eb34e"
 dependencies = [
  "rquickjs-core",
  "rquickjs-macro",
@@ -2683,9 +2677,9 @@ dependencies = [
 
 [[package]]
 name = "rquickjs-core"
-version = "0.12.2"
+version = "0.14.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "16e4f499ac5b943d97ee6dbc44f23c2c10426f420f7d2f1793d6318911b6608c"
+checksum = "6657979a24d543e5fc66f32cef2f47ca82ce8eb55cec5f7d59a12b7b570bbf24"
 dependencies = [
  "hashbrown 0.17.0",
  "relative-path",
@@ -2694,26 +2688,24 @@ dependencies = [
 
 [[package]]
 name = "rquickjs-macro"
-version = "0.12.2"
+version = "0.14.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3cbcc8219b70ee2faa08d5339f47f15741cba2ce0cb9640e8495f2ab51293f50"
+checksum = "0a2ea9adb03b669c933482ff740b683cd36be7cef23891657a8ccb850401d286"
 dependencies = [
- "convert_case 0.11.0",
- "fnv",
- "ident_case",
+ "convert_case 0.12.0",
  "indexmap",
  "proc-macro-crate",
  "proc-macro2",
  "quote",
  "rquickjs-core",
- "syn 2.0.119",
+ "syn 3.0.6",
 ]
 
 [[package]]
 name = "rquickjs-serde"
-version = "0.6.1"
+version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "04cf0aa631f8d0c5051db35f9f59899c34074d7b6be280c03fd4ce6165d0ed35"
+checksum = "976f3350570a1d8611442e491a617c5373f9b9d24ae98c735345f7d3eb8f03bd"
 dependencies = [
  "rquickjs",
  "serde",
@@ -2721,9 +2713,9 @@ dependencies = [
 
 [[package]]
 name = "rquickjs-sys"
-version = "0.12.2"
+version = "0.14.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a13ac243b86a74120814ef7e9e30ad5a2c1199b7b9963b1cf7c84e4cdc1cad99"
+checksum = "cee271d0eeba64f0915b846cb7ae02e16faf3dfdffdca91731101d9d30fe3423"
 dependencies = [
  "bindgen",
  "cc",
diff --git a/Cargo.toml b/Cargo.toml
index 4f8b4ea14..a7f3d4e62 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -33,7 +33,7 @@ wasmtime-wasi = "49.0.2"
 wasmtime-wizer = "49.0.2"
 wasm-opt = "0.116.1"
 anyhow = "1.0"
-javy = { path = "crates/javy", version = "8.1.1-alpha.1" }
+javy = { path = "crates/javy", version = "9.0.0-alpha.1" }
 tempfile = "3.27.0"
 tokio = "1"
 uuid = { version = "1.23", features = ["v4"] }
diff --git a/crates/cli/tests/dylib_test.rs b/crates/cli/tests/dylib_test.rs
index 3f9fd5f53..b1d599547 100644
--- a/crates/cli/tests/dylib_test.rs
+++ b/crates/cli/tests/dylib_test.rs
@@ -24,7 +24,7 @@ fn test_dylib_with_error() -> Result<()> {
     assert!(res.is_err());
 
     let e = res.err().unwrap();
-    let expected_log_output = "Error: foo error\n    at foo (function.mjs:1:27)\n    at <anonymous> (function.mjs:1:49)\n\n";
+    let expected_log_output = "Error: foo error\n    at foo (function.mjs:1:28)\n    at <anonymous> (function.mjs:1:49)\n\n";
     assert_eq!(
         expected_log_output,
         e.downcast_ref::<RunnerError>().unwrap().stderr
diff --git a/crates/cli/tests/integration_test.rs b/crates/cli/tests/integration_test.rs
index 4893eb64c..024d6ee1f 100644
--- a/crates/cli/tests/integration_test.rs
+++ b/crates/cli/tests/integration_test.rs
@@ -11,7 +11,7 @@ fn test_empty(builder: &mut Builder) -> Result<()> {
     let mut runner = builder.input("empty.js").build()?;
 
     let (_, _, fuel_consumed) = run(&mut runner, vec![]);
-    assert_fuel_consumed_within_threshold(18_909, fuel_consumed);
+    assert_fuel_consumed_within_threshold(16_943, fuel_consumed);
     Ok(())
 }
 
@@ -31,7 +31,7 @@ fn test_fib(builder: &mut Builder) -> Result<()> {
 
     let (output, _, fuel_consumed) = run_with_u8s(&mut runner, 5);
     assert_eq!(8, output);
-    assert_fuel_consumed_within_threshold(64_557, fuel_consumed);
+    assert_fuel_consumed_within_threshold(61_850, fuel_consumed);
     Ok(())
 }
 
@@ -81,7 +81,7 @@ fn test_console_log(builder: &mut Builder) -> Result<()> {
     let (output, logs, fuel_consumed) = run(&mut runner, vec![]);
     assert_eq!(b"hello world from console.log\n".to_vec(), output);
     assert_eq!("hello world from console.error\n", logs.as_str());
-    assert_fuel_consumed_within_threshold(30_652, fuel_consumed);
+    assert_fuel_consumed_within_threshold(29_037, fuel_consumed);
     Ok(())
 }
 
@@ -337,7 +337,7 @@ fn test_exported_default_arrow_fn(builder: &mut Builder) -> Result<()> {
 
     let (_, logs, fuel_consumed) = run_fn(&mut runner, "default", vec![]);
     assert_eq!(logs, "42\n");
-    assert_fuel_consumed_within_threshold(33_889, fuel_consumed);
+    assert_fuel_consumed_within_threshold(31_151, fuel_consumed);
     Ok(())
 }
 
@@ -350,7 +350,7 @@ fn test_exported_default_fn(builder: &mut Builder) -> Result<()> {
         .build()?;
     let (_, logs, fuel_consumed) = run_fn(&mut runner, "default", vec![]);
     assert_eq!(logs, "42\n");
-    assert_fuel_consumed_within_threshold(35_195, fuel_consumed);
+    assert_fuel_consumed_within_threshold(32_857, fuel_consumed);
     Ok(())
 }
 
diff --git a/crates/codegen/tests/snapshots/integration_test__default_dynamic.snap b/crates/codegen/tests/snapshots/integration_test__default_dynamic.snap
index a34bb6ff2..94ff8c1f1 100644
--- a/crates/codegen/tests/snapshots/integration_test__default_dynamic.snap
+++ b/crates/codegen/tests/snapshots/integration_test__default_dynamic.snap
@@ -6,9 +6,9 @@ expression: wat
   (type (;0;) (func))
   (type (;1;) (func (param i32 i32 i32 i32) (result i32)))
   (type (;2;) (func (param i32 i32 i32 i32 i32)))
-  (import "javy-default-plugin-v4" "cabi_realloc" (func (;0;) (type 1) (param i32 i32 i32 i32) (result i32)))
-  (import "javy-default-plugin-v4" "invoke" (func (;1;) (type 2) (param i32 i32 i32 i32 i32)))
-  (import "javy-default-plugin-v4" "memory" (memory (;0;) 0))
+  (import "javy-default-plugin-v5" "cabi_realloc" (func (;0;) (type 1) (param i32 i32 i32 i32) (result i32)))
+  (import "javy-default-plugin-v5" "invoke" (func (;1;) (type 2) (param i32 i32 i32 i32 i32)))
+  (import "javy-default-plugin-v5" "memory" (memory (;0;) 0))
   (export "_start" (func 4))
   (export "log" (func 2))
   (export "log2" (func 3))
@@ -88,7 +88,7 @@ expression: wat
     i32.const 0
     call 1
   )
-  (data (;0;) "\1a\c7\14e}\07\01\18function.mjs\01\06log\01\08log2\01\0econsole\01(Hello from function!\01*Hello from function2!\014Hello from top-level scope\0d\e4\03\00\02\00\00\e6\03\00\01\e8\03\00\00\00\0c \0a\01\a8\01\00\00\00\03\00\02\02\1f\00\e6\03\00\06\e8\03\01\06\0cC\0a\01\e6\03\00\00\00\03\00\00\00\13\008\f5\00\00\00A\f3\00\00\00\04\f6\00\00\00$\01\00)\e4\03\01\07\04\03\034\10\00\0cC\0a\01\e8\03\00\00\00\03\00\00\00\13\008\f5\00\00\00A\f3\00\00\00\04\f7\00\00\00$\01\00)\e4\03\05\08\04\03\054\10\00\08\f0\08\c5\00\e7\c5\01\e8)8\f5\00\00\00A\f3\00\00\00\04\f8\00\00\00$\01\00\0e\06/\e4\03\01\01\06\00\0a\10\004\10\00")
+  (data (;0;) "\1c\c7\14e}\07\01\18function.mjs\01\06log\01\08log2\01\0econsole\01(Hello from function!\01*Hello from function2!\014Hello from top-level scope\0d\e4\03\00\02\00\00\e6\03\00\01\e8\03\00\00\00\0c \0a\01\a8\01\00\00\00\03\00\02\02\1f\00\e6\03\00\06\e8\03\01\06\0cC\0a\01\e6\03\00\00\00\03\00\00\00\13\008\f5\00\00\00A\f3\00\00\00\04\f6\00\00\00$\01\00)\e4\03\01\07\04\03\034\10\00\0cC\0a\01\e8\03\00\00\00\03\00\00\00\13\008\f5\00\00\00A\f3\00\00\00\04\f7\00\00\00$\01\00)\e4\03\05\08\04\03\054\10\00\08\f0\08\c5\00\e7\c5\01\e8)8\f5\00\00\00A\f3\00\00\00\04\f8\00\00\00$\01\00\0e\06/\e4\03\01\01\06\00\0a\10\004\10\00")
   (data (;1;) "log")
   (data (;2;) "log2")
   (@producers
diff --git a/crates/javy/CHANGELOG.md b/crates/javy/CHANGELOG.md
index cb31d12c2..a815c8e7d 100644
--- a/crates/javy/CHANGELOG.md
+++ b/crates/javy/CHANGELOG.md
@@ -8,6 +8,10 @@ Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## Unreleased
 
+### Changed
+
+- Bumped rquickjs to 0.14.0. The bytecode format has changed in a breaking way.
+
 ## [8.1.0] - 2026-07-30
 
 ### Added
diff --git a/crates/javy/Cargo.toml b/crates/javy/Cargo.toml
index 476a52194..24c614bec 100644
--- a/crates/javy/Cargo.toml
+++ b/crates/javy/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "javy"
-version = "8.1.1-alpha.1"
+version = "9.0.0-alpha.1"
 authors.workspace = true
 edition.workspace = true
 license.workspace = true
@@ -14,12 +14,12 @@ targets = ["wasip1", "wasip2"]
 
 [dependencies]
 anyhow = { workspace = true }
-rquickjs = { version = "0.12.0", features = [
+rquickjs = { version = "0.14.0", features = [
     "array-buffer",
     "bindgen",
     "disable-assertions",
 ] }
-rquickjs-serde = { version = "0.6.1", optional = true }
+rquickjs-serde = { version = "0.8.0", optional = true }
 serde = { workspace = true, default-features = true, features = ["derive"] }
 serde_json = { workspace = true, optional = true }
 serde-transcode = { version = "1.1", optional = true }
diff --git a/crates/javy/src/apis/stream_io/mod.rs b/crates/javy/src/apis/stream_io/mod.rs
index 3b74b3cf9..272c928a8 100644
--- a/crates/javy/src/apis/stream_io/mod.rs
+++ b/crates/javy/src/apis/stream_io/mod.rs
@@ -83,9 +83,11 @@ fn write(args: Args<'_>) -> Result<Value<'_>> {
         .as_object()
         .ok_or_else(|| anyhow!("Data must be an Object"))?
         .as_array_buffer()
-        .ok_or_else(|| anyhow!("Data must be an ArrayBuffer"))?
-        .as_bytes()
-        .ok_or_else(|| anyhow!("Could not represent data as &[u8]"))?;
+        .ok_or_else(|| anyhow!("Data must be an ArrayBuffer"))?;
+    // SAFETY: No JavaScript runs while the slice is alive; it is only read by
+    // the synchronous stdout/stderr write below.
+    let data =
+        unsafe { data.as_bytes() }.ok_or_else(|| anyhow!("Could not represent data as &[u8]"))?;
 
     let offset = offset
         .as_number()
diff --git a/crates/javy/src/apis/text_encoding/mod.rs b/crates/javy/src/apis/text_encoding/mod.rs
index 1359131db..d4242bdec 100644
--- a/crates/javy/src/apis/text_encoding/mod.rs
+++ b/crates/javy/src/apis/text_encoding/mod.rs
@@ -47,8 +47,10 @@ fn decode(args: Args<'_>) -> Result<Value<'_>> {
         .as_object()
         .ok_or_else(|| anyhow!("buffer must be an object"))?
         .as_array_buffer()
-        .ok_or_else(|| anyhow!("buffer must be an ArrayBuffer"))?
-        .as_bytes()
+        .ok_or_else(|| anyhow!("buffer must be an ArrayBuffer"))?;
+    // SAFETY: No JavaScript runs while the slice is alive; it is only read
+    // during UTF-8 decoding below.
+    let buffer = unsafe { buffer.as_bytes() }
         .ok_or_else(|| anyhow!("Couldn't retrive &[u8] from buffer"))?;
 
     let byte_offset = args[1]
diff --git a/crates/plugin-api/CHANGELOG.md b/crates/plugin-api/CHANGELOG.md
index 4232186b8..475eaacc0 100644
--- a/crates/plugin-api/CHANGELOG.md
+++ b/crates/plugin-api/CHANGELOG.md
@@ -8,6 +8,12 @@ Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## Unreleased
 
+### Changed
+
+- Updated `javy` to 9.0.0-alpha.1, which bumps rquickjs to 0.14.0. If you are
+  using a plugin for dynamic linking, you are strongly encouraged to change
+  the import namespace.
+
 ## [7.1.0] - 2026-06-30
 
 ### Added
diff --git a/crates/plugin-api/Cargo.toml b/crates/plugin-api/Cargo.toml
index 23cb7f2ba..795c04be6 100644
--- a/crates/plugin-api/Cargo.toml
+++ b/crates/plugin-api/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "javy-plugin-api"
-version = "7.1.1-alpha.1"
+version = "8.0.0-alpha.1"
 authors.workspace = true
 edition.workspace = true
 license.workspace = true
diff --git a/crates/plugin/src/lib.rs b/crates/plugin/src/lib.rs
index 58eb51339..871078ca7 100644
--- a/crates/plugin/src/lib.rs
+++ b/crates/plugin/src/lib.rs
@@ -7,7 +7,7 @@ use crate::shared_config::SharedConfig;
 
 mod shared_config;
 
-import_namespace!("javy-default-plugin-v4");
+import_namespace!("javy-default-plugin-v5");
 
 fn config() -> Config {
     // Read shared config JSON in from stdin.
diff --git a/crates/runner/src/lib.rs b/crates/runner/src/lib.rs
index 2039f2d3d..03f63185f 100644
--- a/crates/runner/src/lib.rs
+++ b/crates/runner/src/lib.rs
@@ -34,7 +34,7 @@ impl Plugin {
             Self::InvalidUser => "invalid-plugin",
             // Could try and derive this but not going to for now since tests
             // will break if it changes.
-            Self::Default | Self::DefaultAsUser => "javy-default-plugin-v4",
+            Self::Default | Self::DefaultAsUser => "javy-default-plugin-v5",
             Self::UserWasiP1 { .. } => "test-plugin-wasip1",
             Self::UserWasiP2 { .. } => "test-plugin-wasip2",
         }
diff --git a/docs/docs-using-dynamic-linking.md b/docs/docs-using-dynamic-linking.md
index dff92591f..1e4937bcc 100644
--- a/docs/docs-using-dynamic-linking.md
+++ b/docs/docs-using-dynamic-linking.md
@@ -41,6 +41,6 @@ Run:
 $ echo 'console.log("hello world!");' > my_code.js
 $ javy emit-plugin -o plugin.wasm
 $ javy build -C dynamic -C plugin=plugin.wasm -o my_code.wasm my_code.js
-$ wasmtime run --preload javy-default-plugin-v4=plugin.wasm my_code.wasm
+$ wasmtime run --preload javy-default-plugin-v5=plugin.wasm my_code.wasm
 hello world!
 ```
diff --git a/docs/docs-using-nodejs.md b/docs/docs-using-nodejs.md
index e3275025e..59b8ecb84 100644
--- a/docs/docs-using-nodejs.md
+++ b/docs/docs-using-nodejs.md
@@ -158,7 +158,7 @@ async function runJavy(pluginModule, embeddedModule, input) {
       wasi.getImportObject(),
     );
     const instance = await WebAssembly.instantiate(embeddedModule, {
-      "javy-default-plugin-v4": pluginInstance.exports,
+      "javy-default-plugin-v5": pluginInstance.exports,
     });
 
     // Javy plugin is a WASI reactor see https://github.com/WebAssembly/WASI/blob/main/legacy/application-abi.md?plain=1