diff --git a/build-wasm.sh b/build-wasm.sh
index 16d5e69..a6680bc 100755
--- a/build-wasm.sh
+++ b/build-wasm.sh
@@ -9,18 +9,17 @@ mkdir -p .bin/ 2>/dev/null
 
 # Setup tinygo first
 if [[ ! -d .bin/tinygo ]]; then
-  git clone --depth=1 --branch v0.37.0 https://github.com/tinygo-org/tinygo.git .bin/tinygo
+  git clone --depth=1 --branch v0.38.0 https://github.com/tinygo-org/tinygo.git .bin/tinygo
   pushd .bin/tinygo
   git submodule update --init --recursive
 
   go mod download -x && go mod verify
 
-  make binaryen STATIC=1
-  make wasi-libc
-
   make llvm-source
   make llvm-build
 
+  make binaryen STATIC=1
+
   make build/release
 else
   pushd .bin/tinygo
diff --git a/embed/challenge/js-pow-sha256/runtime/runtime.wasm b/embed/challenge/js-pow-sha256/runtime/runtime.wasm
index e18b75e..b3c38de 100644
Binary files a/embed/challenge/js-pow-sha256/runtime/runtime.wasm and b/embed/challenge/js-pow-sha256/runtime/runtime.wasm differ