diff --git a/CHANGELOG.md b/CHANGELOG.md
index f53e578e..008fafc5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,49 @@
 
 --------------------------------------------------------------------------------
 
+## 0.2.57
+
+Released 2020-01-06.
+
+### Fixed
+
+* The `js_sys::Promise` type is now marked as `#[must_use]`
+  [#1927](https://github.com/rustwasm/wasm-bindgen/pull/1927)
+
+* Duplicate imports of the same name are now handled correctly again.
+  [#1942](https://github.com/rustwasm/wasm-bindgen/pull/1942)
+
+--------------------------------------------------------------------------------
+
+## 0.2.56
+
+Released 2019-12-20.
+
+### Added
+
+* Added a `#[wasm_bindgen(inspectable)]` attribute for exported objects to
+  generate `toJSON` and `toString` implementations.
+  [#1876](https://github.com/rustwasm/wasm-bindgen/pull/1876)
+
+* Support for the most recent interface types proposal has been implemented.
+  [#1882](https://github.com/rustwasm/wasm-bindgen/pull/1882)
+
+* Initial support for async iterators has been added.
+  [#1895](https://github.com/rustwasm/wasm-bindgen/pull/1895)
+
+* Support for an `async` start function was added.
+  [#1905](https://github.com/rustwasm/wasm-bindgen/pull/1905)
+
+* `Array::iter` and `Array::to_vec` methods were added to js-sys.
+  [#1909](https://github.com/rustwasm/wasm-bindgen/pull/1909)
+
+### Fixed
+
+* Another webkit-specific WebIDL construct was fixed in web-sys.
+  [#1865](https://github.com/rustwasm/wasm-bindgen/pull/1865)
+
+--------------------------------------------------------------------------------
+
 ## 0.2.55
 
 Released 2019-11-19.
diff --git a/Cargo.toml b/Cargo.toml
index ec21511a..819f58a0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "wasm-bindgen"
-version = "0.2.56"
+version = "0.2.57"
 authors = ["The wasm-bindgen Developers"]
 license = "MIT/Apache-2.0"
 readme = "README.md"
@@ -36,15 +36,15 @@ strict-macro = ["wasm-bindgen-macro/strict-macro"]
 xxx_debug_only_print_generated_code = ["wasm-bindgen-macro/xxx_debug_only_print_generated_code"]
 
 [dependencies]
-wasm-bindgen-macro = { path = "crates/macro", version = "=0.2.56" }
+wasm-bindgen-macro = { path = "crates/macro", version = "=0.2.57" }
 serde = { version = "1.0", optional = true }
 serde_json = { version = "1.0", optional = true }
 cfg-if = "0.1.9"
 
 [target.'cfg(target_arch = "wasm32")'.dev-dependencies]
-js-sys = { path = 'crates/js-sys', version = '0.3.33' }
-wasm-bindgen-test = { path = 'crates/test', version = '=0.3.6' }
-wasm-bindgen-futures = { path = 'crates/futures', version = '=0.4.6' }
+js-sys = { path = 'crates/js-sys', version = '0.3.34' }
+wasm-bindgen-test = { path = 'crates/test', version = '=0.3.7' }
+wasm-bindgen-futures = { path = 'crates/futures', version = '=0.4.7' }
 serde_derive = "1.0"
 wasm-bindgen-test-crate-a = { path = 'tests/crates/a', version = '0.1' }
 wasm-bindgen-test-crate-b = { path = 'tests/crates/b', version = '0.1' }
diff --git a/crates/anyref-xform/Cargo.toml b/crates/anyref-xform/Cargo.toml
index d4707a84..71136f61 100644
--- a/crates/anyref-xform/Cargo.toml
+++ b/crates/anyref-xform/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "wasm-bindgen-anyref-xform"
-version = "0.2.56"
+version = "0.2.57"
 authors = ["The wasm-bindgen Developers"]
 license = "MIT/Apache-2.0"
 repository = "https://github.com/rustwasm/wasm-bindgen/tree/master/crates/anyref-xform"
diff --git a/crates/backend/Cargo.toml b/crates/backend/Cargo.toml
index 7b1b3d25..6aa89f9f 100644
--- a/crates/backend/Cargo.toml
+++ b/crates/backend/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "wasm-bindgen-backend"
-version = "0.2.56"
+version = "0.2.57"
 authors = ["The wasm-bindgen Developers"]
 license = "MIT/Apache-2.0"
 repository = "https://github.com/rustwasm/wasm-bindgen/tree/master/crates/backend"
@@ -22,4 +22,4 @@ log = "0.4"
 proc-macro2 = "1.0"
 quote = '1.0'
 syn = { version = '1.0', features = ['full'] }
-wasm-bindgen-shared = { path = "../shared", version = "=0.2.56" }
+wasm-bindgen-shared = { path = "../shared", version = "=0.2.57" }
diff --git a/crates/cli-support/Cargo.toml b/crates/cli-support/Cargo.toml
index e54d324a..1b30ee9a 100644
--- a/crates/cli-support/Cargo.toml
+++ b/crates/cli-support/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "wasm-bindgen-cli-support"
-version = "0.2.56"
+version = "0.2.57"
 authors = ["The wasm-bindgen Developers"]
 license = "MIT/Apache-2.0"
 repository = "https://github.com/rustwasm/wasm-bindgen/tree/master/crates/cli-support"
@@ -19,12 +19,12 @@ rustc-demangle = "0.1.13"
 serde_json = "1.0"
 tempfile = "3.0"
 walrus = "0.14.0"
-wasm-bindgen-anyref-xform = { path = '../anyref-xform', version = '=0.2.56' }
-wasm-bindgen-multi-value-xform = { path = '../multi-value-xform', version = '=0.2.56' }
-wasm-bindgen-shared = { path = "../shared", version = '=0.2.56' }
-wasm-bindgen-threads-xform = { path = '../threads-xform', version = '=0.2.56' }
-wasm-bindgen-wasm-conventions = { path = '../wasm-conventions', version = '=0.2.56' }
-wasm-bindgen-wasm-interpreter = { path = "../wasm-interpreter", version = '=0.2.56' }
+wasm-bindgen-anyref-xform = { path = '../anyref-xform', version = '=0.2.57' }
+wasm-bindgen-multi-value-xform = { path = '../multi-value-xform', version = '=0.2.57' }
+wasm-bindgen-shared = { path = "../shared", version = '=0.2.57' }
+wasm-bindgen-threads-xform = { path = '../threads-xform', version = '=0.2.57' }
+wasm-bindgen-wasm-conventions = { path = '../wasm-conventions', version = '=0.2.57' }
+wasm-bindgen-wasm-interpreter = { path = "../wasm-interpreter", version = '=0.2.57' }
 wit-text = "0.1.1"
 wit-walrus = "0.1.0"
 wit-validator = "0.1.0"
diff --git a/crates/cli/Cargo.toml b/crates/cli/Cargo.toml
index 7ecb02cc..8eeed44e 100644
--- a/crates/cli/Cargo.toml
+++ b/crates/cli/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "wasm-bindgen-cli"
-version = "0.2.56"
+version = "0.2.57"
 authors = ["The wasm-bindgen Developers"]
 license = "MIT/Apache-2.0"
 repository = "https://github.com/rustwasm/wasm-bindgen/tree/master/crates/cli"
@@ -25,8 +25,8 @@ serde = { version = "1.0", features = ['derive'] }
 serde_derive = "1.0"
 serde_json = "1.0"
 walrus = { version = "0.14.0", features = ['parallel'] }
-wasm-bindgen-cli-support = { path = "../cli-support", version = "=0.2.56" }
-wasm-bindgen-shared = { path = "../shared", version = "=0.2.56" }
+wasm-bindgen-cli-support = { path = "../cli-support", version = "=0.2.57" }
+wasm-bindgen-shared = { path = "../shared", version = "=0.2.57" }
 
 [dev-dependencies]
 assert_cmd = "0.11"
diff --git a/crates/futures/Cargo.toml b/crates/futures/Cargo.toml
index 3fe499de..19daf599 100644
--- a/crates/futures/Cargo.toml
+++ b/crates/futures/Cargo.toml
@@ -7,13 +7,13 @@ license = "MIT/Apache-2.0"
 name = "wasm-bindgen-futures"
 repository = "https://github.com/rustwasm/wasm-bindgen/tree/master/crates/futures"
 readme = "./README.md"
-version = "0.4.6"
+version = "0.4.7"
 edition = "2018"
 
 [dependencies]
 cfg-if = "0.1.9"
-js-sys = { path = "../js-sys", version = '0.3.33' }
-wasm-bindgen = { path = "../..", version = '0.2.56' }
+js-sys = { path = "../js-sys", version = '0.3.34' }
+wasm-bindgen = { path = "../..", version = '0.2.57' }
 
 [target.'cfg(target_feature = "atomics")'.dependencies.web-sys]
 path = "../web-sys"
@@ -24,5 +24,5 @@ features = [
 ]
 
 [target.'cfg(target_arch = "wasm32")'.dev-dependencies]
-wasm-bindgen-test = { path = '../test', version = '0.3.6' }
+wasm-bindgen-test = { path = '../test', version = '0.3.7' }
 futures-channel-preview = { version = "0.3.0-alpha.18" }
diff --git a/crates/js-sys/Cargo.toml b/crates/js-sys/Cargo.toml
index e8eb5fbe..070e348a 100644
--- a/crates/js-sys/Cargo.toml
+++ b/crates/js-sys/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "js-sys"
-version = "0.3.33"
+version = "0.3.34"
 authors = ["The wasm-bindgen Developers"]
 readme = "./README.md"
 categories = ["wasm"]
@@ -19,8 +19,8 @@ test = false
 doctest = false
 
 [dependencies]
-wasm-bindgen = { path = "../..", version = "0.2.56" }
+wasm-bindgen = { path = "../..", version = "0.2.57" }
 
 [target.'cfg(target_arch = "wasm32")'.dev-dependencies]
-wasm-bindgen-test = { path = '../test', version = '=0.3.6' }
-wasm-bindgen-futures = { path = '../futures', version = '0.4.6' }
+wasm-bindgen-test = { path = '../test', version = '=0.3.7' }
+wasm-bindgen-futures = { path = '../futures', version = '0.4.7' }
diff --git a/crates/macro-support/Cargo.toml b/crates/macro-support/Cargo.toml
index 8221dfb2..7b42fef6 100644
--- a/crates/macro-support/Cargo.toml
+++ b/crates/macro-support/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "wasm-bindgen-macro-support"
-version = "0.2.56"
+version = "0.2.57"
 authors = ["The wasm-bindgen Developers"]
 license = "MIT/Apache-2.0"
 repository = "https://github.com/rustwasm/wasm-bindgen/tree/master/crates/macro-support"
@@ -20,5 +20,5 @@ strict-macro = []
 syn = { version = '1.0', features = ['visit'] }
 quote = '1.0'
 proc-macro2 = "1.0"
-wasm-bindgen-backend = { path = "../backend", version = "=0.2.56" }
-wasm-bindgen-shared = { path = "../shared", version = "=0.2.56" }
+wasm-bindgen-backend = { path = "../backend", version = "=0.2.57" }
+wasm-bindgen-shared = { path = "../shared", version = "=0.2.57" }
diff --git a/crates/macro/Cargo.toml b/crates/macro/Cargo.toml
index b1386f51..8aad3206 100644
--- a/crates/macro/Cargo.toml
+++ b/crates/macro/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "wasm-bindgen-macro"
-version = "0.2.56"
+version = "0.2.57"
 authors = ["The wasm-bindgen Developers"]
 license = "MIT/Apache-2.0"
 repository = "https://github.com/rustwasm/wasm-bindgen/tree/master/crates/macro"
@@ -20,10 +20,10 @@ xxx_debug_only_print_generated_code = []
 strict-macro = ["wasm-bindgen-macro-support/strict-macro"]
 
 [dependencies]
-wasm-bindgen-macro-support = { path = "../macro-support", version = "=0.2.56" }
+wasm-bindgen-macro-support = { path = "../macro-support", version = "=0.2.57" }
 quote = "1.0"
 
 [dev-dependencies]
 trybuild = "1.0"
-wasm-bindgen = { path = "../..", version = "0.2.56", features = ['strict-macro'] }
-wasm-bindgen-futures = { path = "../futures", version = "0.4.6" }
+wasm-bindgen = { path = "../..", version = "0.2.57", features = ['strict-macro'] }
+wasm-bindgen-futures = { path = "../futures", version = "0.4.7" }
diff --git a/crates/multi-value-xform/Cargo.toml b/crates/multi-value-xform/Cargo.toml
index f4ffc5a4..a209ad2b 100644
--- a/crates/multi-value-xform/Cargo.toml
+++ b/crates/multi-value-xform/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "wasm-bindgen-multi-value-xform"
-version = "0.2.56"
+version = "0.2.57"
 authors = ["The wasm-bindgen Developers"]
 license = "MIT/Apache-2.0"
 repository = "https://github.com/rustwasm/wasm-bindgen/tree/master/crates/multi-value-xform"
diff --git a/crates/shared/Cargo.toml b/crates/shared/Cargo.toml
index 87cd8189..9bc2535c 100644
--- a/crates/shared/Cargo.toml
+++ b/crates/shared/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "wasm-bindgen-shared"
-version = "0.2.56"
+version = "0.2.57"
 authors = ["The wasm-bindgen Developers"]
 license = "MIT/Apache-2.0"
 repository = "https://github.com/rustwasm/wasm-bindgen/tree/master/crates/shared"
diff --git a/crates/test-macro/Cargo.toml b/crates/test-macro/Cargo.toml
index c4441a2c..9c3b791e 100644
--- a/crates/test-macro/Cargo.toml
+++ b/crates/test-macro/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "wasm-bindgen-test-macro"
-version = "0.3.6"
+version = "0.3.7"
 authors = ["The wasm-bindgen Developers"]
 description = "Internal testing macro for wasm-bindgen"
 license = "MIT/Apache-2.0"
diff --git a/crates/test/Cargo.toml b/crates/test/Cargo.toml
index f98c3440..86411889 100644
--- a/crates/test/Cargo.toml
+++ b/crates/test/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "wasm-bindgen-test"
-version = "0.3.6"
+version = "0.3.7"
 authors = ["The wasm-bindgen Developers"]
 description = "Internal testing crate for wasm-bindgen"
 license = "MIT/Apache-2.0"
@@ -9,11 +9,11 @@ edition = "2018"
 
 [dependencies]
 console_error_panic_hook = '0.1'
-js-sys = { path = '../js-sys', version = '0.3.33' }
+js-sys = { path = '../js-sys', version = '0.3.34' }
 scoped-tls = "1.0"
-wasm-bindgen = { path = '../..', version = '0.2.56' }
-wasm-bindgen-futures = { path = '../futures', version = '0.4.6' }
-wasm-bindgen-test-macro = { path = '../test-macro', version = '=0.3.6' }
+wasm-bindgen = { path = '../..', version = '0.2.57' }
+wasm-bindgen-futures = { path = '../futures', version = '0.4.7' }
+wasm-bindgen-test-macro = { path = '../test-macro', version = '=0.3.7' }
 
 [lib]
 test = false
diff --git a/crates/threads-xform/Cargo.toml b/crates/threads-xform/Cargo.toml
index 3f3d9821..f1467faa 100644
--- a/crates/threads-xform/Cargo.toml
+++ b/crates/threads-xform/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "wasm-bindgen-threads-xform"
-version = "0.2.56"
+version = "0.2.57"
 authors = ["The wasm-bindgen Developers"]
 license = "MIT/Apache-2.0"
 repository = "https://github.com/rustwasm/wasm-bindgen/tree/master/crates/threads-xform"
@@ -14,4 +14,4 @@ edition = "2018"
 [dependencies]
 anyhow = "1.0"
 walrus = "0.14.0"
-wasm-bindgen-wasm-conventions = { path = "../wasm-conventions", version = "=0.2.56" }
+wasm-bindgen-wasm-conventions = { path = "../wasm-conventions", version = "=0.2.57" }
diff --git a/crates/wasm-conventions/Cargo.toml b/crates/wasm-conventions/Cargo.toml
index 5c7dcf93..d01786a2 100644
--- a/crates/wasm-conventions/Cargo.toml
+++ b/crates/wasm-conventions/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "wasm-bindgen-wasm-conventions"
-version = "0.2.56"
+version = "0.2.57"
 authors = ["The wasm-bindgen developers"]
 license = "MIT/Apache-2.0"
 repository = "https://github.com/rustwasm/wasm-bindgen/tree/master/crates/wasm-conventions"
diff --git a/crates/wasm-interpreter/Cargo.toml b/crates/wasm-interpreter/Cargo.toml
index de9145a9..1e560c26 100644
--- a/crates/wasm-interpreter/Cargo.toml
+++ b/crates/wasm-interpreter/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "wasm-bindgen-wasm-interpreter"
-version = "0.2.56"
+version = "0.2.57"
 authors = ["The wasm-bindgen Developers"]
 license = "MIT/Apache-2.0"
 repository = "https://github.com/rustwasm/wasm-bindgen/tree/master/crates/wasm-interpreter"
diff --git a/crates/web-sys/Cargo.toml b/crates/web-sys/Cargo.toml
index 1e800822..adb684d2 100644
--- a/crates/web-sys/Cargo.toml
+++ b/crates/web-sys/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "web-sys"
-version = "0.3.33"
+version = "0.3.34"
 authors = ["The wasm-bindgen Developers"]
 readme = "./README.md"
 homepage = "https://rustwasm.github.io/wasm-bindgen/web-sys/index.html"
@@ -22,16 +22,16 @@ test = false
 [build-dependencies]
 env_logger = { version = "0.7.0", optional = true }
 anyhow = "1.0"
-wasm-bindgen-webidl = { path = "../webidl", version = "=0.2.56" }
+wasm-bindgen-webidl = { path = "../webidl", version = "=0.2.57" }
 sourcefile = "0.1"
 
 [dependencies]
-wasm-bindgen = { path = "../..", version = "0.2.56" }
-js-sys = { path = '../js-sys', version = '0.3.33' }
+wasm-bindgen = { path = "../..", version = "0.2.57" }
+js-sys = { path = '../js-sys', version = '0.3.34' }
 
 [target.'cfg(target_arch = "wasm32")'.dev-dependencies]
-wasm-bindgen-test = { path = '../test', version = '0.3.6' }
-wasm-bindgen-futures = { path = '../futures', version = '0.4.6' }
+wasm-bindgen-test = { path = '../test', version = '0.3.7' }
+wasm-bindgen-futures = { path = '../futures', version = '0.4.7' }
 
 # This list is generated by passing `__WASM_BINDGEN_DUMP_FEATURES=foo` when
 # compiling this crate which dumps the total list of features to a file called
diff --git a/crates/webidl/Cargo.toml b/crates/webidl/Cargo.toml
index 4c99b58e..b7c36a9a 100644
--- a/crates/webidl/Cargo.toml
+++ b/crates/webidl/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "wasm-bindgen-webidl"
-version = "0.2.56"
+version = "0.2.57"
 authors = ["The wasm-bindgen Developers"]
 license = "MIT/Apache-2.0"
 categories = ["wasm"]
@@ -19,5 +19,5 @@ log = "0.4.1"
 proc-macro2 = "1.0"
 quote = '1.0'
 syn = { version = '1.0', features = ['full'] }
-wasm-bindgen-backend = { version = "=0.2.56", path = "../backend" }
+wasm-bindgen-backend = { version = "=0.2.57", path = "../backend" }
 weedle = "0.10"
diff --git a/examples/add/Cargo.toml b/examples/add/Cargo.toml
index 0157f935..5052fc92 100644
--- a/examples/add/Cargo.toml
+++ b/examples/add/Cargo.toml
@@ -8,4 +8,4 @@ edition = "2018"
 crate-type = ["cdylib"]
 
 [dependencies]
-wasm-bindgen = "0.2.56"
+wasm-bindgen = "0.2.57"
diff --git a/examples/canvas/Cargo.toml b/examples/canvas/Cargo.toml
index d120ac6a..06972266 100644
--- a/examples/canvas/Cargo.toml
+++ b/examples/canvas/Cargo.toml
@@ -8,8 +8,8 @@ edition = "2018"
 crate-type = ["cdylib"]
 
 [dependencies]
-js-sys = "0.3.33"
-wasm-bindgen = "0.2.56"
+js-sys = "0.3.34"
+wasm-bindgen = "0.2.57"
 
 [dependencies.web-sys]
 version = "0.3.4"
diff --git a/examples/char/Cargo.toml b/examples/char/Cargo.toml
index b7d8aa60..eb3b6d43 100644
--- a/examples/char/Cargo.toml
+++ b/examples/char/Cargo.toml
@@ -8,4 +8,4 @@ edition = "2018"
 crate-type = ["cdylib"]
 
 [dependencies]
-wasm-bindgen = "0.2.56"
+wasm-bindgen = "0.2.57"
diff --git a/examples/closures/Cargo.toml b/examples/closures/Cargo.toml
index 94288261..968bcfae 100644
--- a/examples/closures/Cargo.toml
+++ b/examples/closures/Cargo.toml
@@ -8,8 +8,8 @@ edition = "2018"
 crate-type = ["cdylib"]
 
 [dependencies]
-wasm-bindgen = "0.2.56"
-js-sys = "0.3.33"
+wasm-bindgen = "0.2.57"
+js-sys = "0.3.34"
 
 [dependencies.web-sys]
 version = "0.3.4"
diff --git a/examples/console_log/Cargo.toml b/examples/console_log/Cargo.toml
index 193c2685..a7e0b539 100644
--- a/examples/console_log/Cargo.toml
+++ b/examples/console_log/Cargo.toml
@@ -8,5 +8,5 @@ edition = "2018"
 crate-type = ["cdylib"]
 
 [dependencies]
-wasm-bindgen = "0.2.56"
-web-sys = { version = "0.3.33", features = ['console'] }
+wasm-bindgen = "0.2.57"
+web-sys = { version = "0.3.34", features = ['console'] }
diff --git a/examples/dom/Cargo.toml b/examples/dom/Cargo.toml
index dfb61ee5..2fedf36b 100644
--- a/examples/dom/Cargo.toml
+++ b/examples/dom/Cargo.toml
@@ -8,7 +8,7 @@ edition = "2018"
 crate-type = ["cdylib"]
 
 [dependencies]
-wasm-bindgen = "0.2.56"
+wasm-bindgen = "0.2.57"
 
 [dependencies.web-sys]
 version = "0.3.4"
diff --git a/examples/duck-typed-interfaces/Cargo.toml b/examples/duck-typed-interfaces/Cargo.toml
index f0773e9b..ee1a5719 100644
--- a/examples/duck-typed-interfaces/Cargo.toml
+++ b/examples/duck-typed-interfaces/Cargo.toml
@@ -8,4 +8,4 @@ edition = "2018"
 crate-type = ["cdylib"]
 
 [dependencies]
-wasm-bindgen = "0.2.56"
+wasm-bindgen = "0.2.57"
diff --git a/examples/fetch/Cargo.toml b/examples/fetch/Cargo.toml
index 8a9b9f06..d08b3a62 100644
--- a/examples/fetch/Cargo.toml
+++ b/examples/fetch/Cargo.toml
@@ -8,9 +8,9 @@ edition = "2018"
 crate-type = ["cdylib"]
 
 [dependencies]
-wasm-bindgen = { version = "0.2.56", features = ["serde-serialize"]  }
-js-sys = "0.3.33"
-wasm-bindgen-futures = "0.4.6"
+wasm-bindgen = { version = "0.2.57", features = ["serde-serialize"]  }
+js-sys = "0.3.34"
+wasm-bindgen-futures = "0.4.7"
 serde = { version = "1.0.80", features = ["derive"] }
 serde_derive = "^1.0.59"
 
diff --git a/examples/guide-supported-types-examples/Cargo.toml b/examples/guide-supported-types-examples/Cargo.toml
index 81f17684..647f5246 100644
--- a/examples/guide-supported-types-examples/Cargo.toml
+++ b/examples/guide-supported-types-examples/Cargo.toml
@@ -8,4 +8,4 @@ edition = "2018"
 crate-type = ["cdylib"]
 
 [dependencies]
-wasm-bindgen = "0.2.56"
+wasm-bindgen = "0.2.57"
diff --git a/examples/hello_world/Cargo.toml b/examples/hello_world/Cargo.toml
index 63c316aa..9a57b95f 100644
--- a/examples/hello_world/Cargo.toml
+++ b/examples/hello_world/Cargo.toml
@@ -8,4 +8,4 @@ edition = "2018"
 crate-type = ["cdylib"]
 
 [dependencies]
-wasm-bindgen = "0.2.56"
+wasm-bindgen = "0.2.57"
diff --git a/examples/import_js/crate/Cargo.toml b/examples/import_js/crate/Cargo.toml
index 991633eb..bcb990d6 100644
--- a/examples/import_js/crate/Cargo.toml
+++ b/examples/import_js/crate/Cargo.toml
@@ -8,4 +8,4 @@ edition = "2018"
 crate-type = ["cdylib"]
 
 [dependencies]
-wasm-bindgen = "0.2.56"
+wasm-bindgen = "0.2.57"
diff --git a/examples/julia_set/Cargo.toml b/examples/julia_set/Cargo.toml
index 804d8dc2..4228a1dc 100644
--- a/examples/julia_set/Cargo.toml
+++ b/examples/julia_set/Cargo.toml
@@ -8,7 +8,7 @@ edition = "2018"
 crate-type = ["cdylib"]
 
 [dependencies]
-wasm-bindgen = "0.2.56"
+wasm-bindgen = "0.2.57"
 
 [dependencies.web-sys]
 version = "0.3.4"
diff --git a/examples/paint/Cargo.toml b/examples/paint/Cargo.toml
index aeb11017..94dfa001 100644
--- a/examples/paint/Cargo.toml
+++ b/examples/paint/Cargo.toml
@@ -8,8 +8,8 @@ edition = "2018"
 crate-type = ["cdylib"]
 
 [dependencies]
-js-sys = "0.3.33"
-wasm-bindgen = "0.2.56"
+js-sys = "0.3.34"
+wasm-bindgen = "0.2.57"
 
 [dependencies.web-sys]
 version = "0.3.4"
diff --git a/examples/performance/Cargo.toml b/examples/performance/Cargo.toml
index 2a2008a7..e31ea2e9 100644
--- a/examples/performance/Cargo.toml
+++ b/examples/performance/Cargo.toml
@@ -8,7 +8,7 @@ edition = "2018"
 crate-type = ["cdylib"]
 
 [dependencies]
-wasm-bindgen = "0.2.56"
+wasm-bindgen = "0.2.57"
 humantime = "1"
 
 [dependencies.web-sys]
diff --git a/examples/raytrace-parallel/Cargo.toml b/examples/raytrace-parallel/Cargo.toml
index d551729a..8f94d5d1 100644
--- a/examples/raytrace-parallel/Cargo.toml
+++ b/examples/raytrace-parallel/Cargo.toml
@@ -9,13 +9,13 @@ crate-type = ["cdylib"]
 
 [dependencies]
 console_error_panic_hook = "0.1"
-js-sys = "0.3.33"
+js-sys = "0.3.34"
 rayon = "1.1.0"
 rayon-core = "1.5.0"
 raytracer = { git = 'https://github.com/alexcrichton/raytracer', branch = 'update-deps' }
 futures-channel-preview = "0.3.0-alpha.18"
-wasm-bindgen = { version = "0.2.56", features = ['serde-serialize'] }
-wasm-bindgen-futures = "0.4.6"
+wasm-bindgen = { version = "0.2.57", features = ['serde-serialize'] }
+wasm-bindgen-futures = "0.4.7"
 
 [dependencies.web-sys]
 version = "0.3.23"
diff --git a/examples/request-animation-frame/Cargo.toml b/examples/request-animation-frame/Cargo.toml
index c7ad9ead..dbd6d36b 100644
--- a/examples/request-animation-frame/Cargo.toml
+++ b/examples/request-animation-frame/Cargo.toml
@@ -8,7 +8,7 @@ edition = "2018"
 crate-type = ["cdylib"]
 
 [dependencies]
-wasm-bindgen = "0.2.56"
+wasm-bindgen = "0.2.57"
 
 [dependencies.web-sys]
 version = "0.3.4"
diff --git a/examples/todomvc/Cargo.toml b/examples/todomvc/Cargo.toml
index 79164716..773f6ce7 100644
--- a/examples/todomvc/Cargo.toml
+++ b/examples/todomvc/Cargo.toml
@@ -11,8 +11,8 @@ crate-type = ["cdylib"]
 askama = "0.7.2"
 
 [dependencies]
-js-sys = "0.3.33"
-wasm-bindgen = "0.2.56"
+js-sys = "0.3.34"
+wasm-bindgen = "0.2.57"
 askama = "0.7.2"
 console_error_panic_hook = "0.1.5"
 
diff --git a/examples/wasm-in-wasm/Cargo.toml b/examples/wasm-in-wasm/Cargo.toml
index aacf78dd..81eefd54 100644
--- a/examples/wasm-in-wasm/Cargo.toml
+++ b/examples/wasm-in-wasm/Cargo.toml
@@ -8,6 +8,6 @@ edition = "2018"
 crate-type = ["cdylib"]
 
 [dependencies]
-wasm-bindgen = "0.2.56"
-js-sys = "0.3.33"
-wasm-bindgen-futures = "0.4.6"
+wasm-bindgen = "0.2.57"
+js-sys = "0.3.34"
+wasm-bindgen-futures = "0.4.7"
diff --git a/examples/wasm2js/Cargo.toml b/examples/wasm2js/Cargo.toml
index 82b64a70..43e4d99a 100644
--- a/examples/wasm2js/Cargo.toml
+++ b/examples/wasm2js/Cargo.toml
@@ -8,4 +8,4 @@ edition = "2018"
 crate-type = ["cdylib"]
 
 [dependencies]
-wasm-bindgen = "0.2.56"
+wasm-bindgen = "0.2.57"
diff --git a/examples/webaudio/Cargo.toml b/examples/webaudio/Cargo.toml
index 3ac815d4..d8a37871 100644
--- a/examples/webaudio/Cargo.toml
+++ b/examples/webaudio/Cargo.toml
@@ -8,7 +8,7 @@ edition = "2018"
 crate-type = ["cdylib"]
 
 [dependencies]
-wasm-bindgen = "0.2.56"
+wasm-bindgen = "0.2.57"
 
 [dependencies.web-sys]
 version = "0.3.4"
diff --git a/examples/webgl/Cargo.toml b/examples/webgl/Cargo.toml
index 72a19e39..cb1b2d18 100644
--- a/examples/webgl/Cargo.toml
+++ b/examples/webgl/Cargo.toml
@@ -8,8 +8,8 @@ edition = "2018"
 crate-type = ["cdylib"]
 
 [dependencies]
-js-sys = "0.3.33"
-wasm-bindgen = "0.2.56"
+js-sys = "0.3.34"
+wasm-bindgen = "0.2.57"
 
 [dependencies.web-sys]
 version = "0.3.4"
diff --git a/examples/websockets/Cargo.toml b/examples/websockets/Cargo.toml
index 844cf5e3..f0a7f47d 100644
--- a/examples/websockets/Cargo.toml
+++ b/examples/websockets/Cargo.toml
@@ -8,7 +8,7 @@ edition = "2018"
 crate-type = ["cdylib"]
 
 [dependencies]
-wasm-bindgen = "0.2.56"
+wasm-bindgen = "0.2.57"
 
 [dependencies.web-sys]
 version = "0.3.22"
diff --git a/examples/without-a-bundler/Cargo.toml b/examples/without-a-bundler/Cargo.toml
index 6891be84..65394544 100644
--- a/examples/without-a-bundler/Cargo.toml
+++ b/examples/without-a-bundler/Cargo.toml
@@ -8,7 +8,7 @@ edition = "2018"
 crate-type = ["cdylib"]
 
 [dependencies]
-wasm-bindgen = "0.2.56"
+wasm-bindgen = "0.2.57"
 
 [dependencies.web-sys]
 version = "0.3.4"