diff --git a/substrate/Cargo.lock b/substrate/Cargo.lock
index 20ed87326b..7bb44a0e6d 100644
--- a/substrate/Cargo.lock
+++ b/substrate/Cargo.lock
@@ -9251,7 +9251,7 @@ version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3bfd5b7557925ce778ff9b9ef90e3ade34c524b5ff10e239c69a42d546d2af56"
 dependencies = [
- "rand 0.3.23",
+ "rand 0.7.3",
 ]
 
 [[package]]
@@ -9475,9 +9475,9 @@ checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
 
 [[package]]
 name = "wasm-bindgen"
-version = "0.2.62"
+version = "0.2.67"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e3c7d40d09cdbf0f4895ae58cf57d92e1e57a9dd8ed2e8390514b54a47cc5551"
+checksum = "f0563a9a4b071746dd5aedbc3a28c6fe9be4586fb3fbadb67c400d4f53c6b16c"
 dependencies = [
  "cfg-if",
  "serde",
@@ -9487,9 +9487,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-backend"
-version = "0.2.62"
+version = "0.2.67"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c3972e137ebf830900db522d6c8fd74d1900dcfc733462e9a12e942b00b4ac94"
+checksum = "bc71e4c5efa60fb9e74160e89b93353bc24059999c0ae0fb03affc39770310b0"
 dependencies = [
  "bumpalo",
  "lazy_static",
@@ -9514,9 +9514,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-macro"
-version = "0.2.62"
+version = "0.2.67"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2cd85aa2c579e8892442954685f0d801f9129de24fa2136b2c6a539c76b65776"
+checksum = "97c57cefa5fa80e2ba15641578b44d36e7a64279bc5ed43c6dbaf329457a2ed2"
 dependencies = [
  "quote",
  "wasm-bindgen-macro-support",
@@ -9524,9 +9524,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-macro-support"
-version = "0.2.62"
+version = "0.2.67"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8eb197bd3a47553334907ffd2f16507b4f4f01bbec3ac921a7719e0decdfe72a"
+checksum = "841a6d1c35c6f596ccea1f82504a192a60378f64b3bb0261904ad8f2f5657556"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -9537,9 +9537,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-shared"
-version = "0.2.62"
+version = "0.2.67"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a91c2916119c17a8e316507afaaa2dd94b47646048014bbdf6bef098c1bb58ad"
+checksum = "93b162580e34310e5931c4b792560108b10fd14d64915d7fff8ff00180e70092"
 
 [[package]]
 name = "wasm-bindgen-test"
diff --git a/substrate/bin/node/browser-testing/Cargo.toml b/substrate/bin/node/browser-testing/Cargo.toml
index a5004df20e..c3136ab74a 100644
--- a/substrate/bin/node/browser-testing/Cargo.toml
+++ b/substrate/bin/node/browser-testing/Cargo.toml
@@ -12,7 +12,7 @@ libp2p = { version = "0.22.0", default-features = false }
 jsonrpc-core = "14.2.0"
 serde = "1.0.106"
 serde_json = "1.0.48"
-wasm-bindgen = { version = "=0.2.62", features = ["serde-serialize"] }
+wasm-bindgen = { version = "=0.2.67", features = ["serde-serialize"] }
 wasm-bindgen-futures = "0.4.10"
 wasm-bindgen-test = "0.3.10"
 futures = "0.3.4"
diff --git a/substrate/bin/node/cli/browser-demo/README.md b/substrate/bin/node/cli/browser-demo/README.md
index 08f1646f11..a11b250ba1 100644
--- a/substrate/bin/node/cli/browser-demo/README.md
+++ b/substrate/bin/node/cli/browser-demo/README.md
@@ -1,6 +1,10 @@
 # How to run this demo
 
 ```sh
-cargo install wasm-bindgen-cli		# If necessary
+# If necessary, install wasm-bindgen
+# The version must match that used when building the browser demo.
+cargo install --version 0.2.67 wasm-bindgen-cli
+
+# Run the build script
 ./build.sh
 ```
diff --git a/substrate/bin/node/cli/browser-demo/build.sh b/substrate/bin/node/cli/browser-demo/build.sh
index be52b7a523..ea0380b760 100755
--- a/substrate/bin/node/cli/browser-demo/build.sh
+++ b/substrate/bin/node/cli/browser-demo/build.sh
@@ -1,4 +1,4 @@
 #!/usr/bin/env sh
 cargo +nightly build --release -p node-cli --target wasm32-unknown-unknown --no-default-features --features browser -Z features=itarget
 wasm-bindgen ../../../../target/wasm32-unknown-unknown/release/node_cli.wasm --out-dir pkg --target web
-python -m http.server 8000
+python -m SimpleHTTPServer 8000