diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0691cba81d..c053610801 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -89,6 +89,9 @@ jobs:
       - name: cargo clippy
         run: cargo xtask clippy
 
+      - name: Install WASI dependencies
+        run: script/setup-wasm
+
       - name: Run tests
         uses: ./.github/actions/run_tests
 
diff --git a/script/setup-wasm b/script/setup-wasm
new file mode 100755
index 0000000000..a3674ba833
--- /dev/null
+++ b/script/setup-wasm
@@ -0,0 +1,15 @@
+#!/bin/bash
+
+set -eu
+
+WASI_ADAPTER_URL="https://github.com/bytecodealliance/wasmtime/releases/download/v18.0.2/wasi_snapshot_preview1.reactor.wasm"
+WASI_SDK_URL="https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-21/wasi-sdk-21.0-macos.tar.gz"
+
+echo "Downloading WASI adapter: $WASI_ADAPTER_URL"
+curl -L $WASI_ADAPTER_URL -o target/wasi_snapshot_preview1.reactor.wasm
+
+echo "Downloading WASI SDK: $WASI_SDK_URL"
+mkdir -p target/wasi-sdk.archive
+curl -L $WASI_SDK_URL | tar -xz - -C target/wasi-sdk.archive
+rm -rf target/wasi-sdk/
+mv -f target/wasi-sdk.archive/wasi-sdk-21.0/ target/wasi-sdk