diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2a893fe..b67dad1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -34,6 +34,11 @@ jobs:
         with:
           python-version: "3.11"
 
+      - name: Setup emsdk
+        uses: mymindstorm/setup-emsdk@v14
+        with:
+          version: 4.0.13
+
       - name: Set up uv package manager
         uses: astral-sh/setup-uv@v5
 
@@ -50,7 +55,10 @@ jobs:
         if: steps.cache-demo-data.outputs.cache-hit != 'true'
         run: cd packages/docs && uv run generate_demo_data.py
 
-      - name: Run custom build script
+      - name: Build WASM modules
+        run: ./scripts/build_wasm.sh
+
+      - name: Build JavaScript and Python packages
         run: ./scripts/build.sh
 
       - name: Upload node package artifact
diff --git a/packages/density-clustering/package.json b/packages/density-clustering/package.json
index 42049fb..fe1db41 100644
--- a/packages/density-clustering/package.json
+++ b/packages/density-clustering/package.json
@@ -7,7 +7,7 @@
   "module": "density_clustering_wasm/js/index.js",
   "type": "module",
   "scripts": {
-    "build": "npx wasm-pack build --release --target web density_clustering_wasm && rm density_clustering_wasm/pkg/.gitignore density_clustering_wasm/pkg/package.json"
+    "build": "npx -y wasm-pack build --release --target web density_clustering_wasm && rm density_clustering_wasm/pkg/.gitignore density_clustering_wasm/pkg/package.json"
   },
   "files": [
     "density_clustering_wasm/js/index.js",
diff --git a/packages/umap-wasm/Makefile b/packages/umap-wasm/Makefile
index 5b4500c..7eb5fb0 100644
--- a/packages/umap-wasm/Makefile
+++ b/packages/umap-wasm/Makefile
@@ -23,6 +23,7 @@ runtime.js: $(SOURCES) $(HEADERS)
 		-DUMAPPP_NO_PARALLEL_OPTIMIZATION \
 		-sENVIRONMENT=web \
 		-sMODULARIZE -sSINGLE_FILE -sALLOW_MEMORY_GROWTH \
+		-sEXPORTED_RUNTIME_METHODS='["HEAP32", "HEAPF32", "HEAPU8"]' \
 		-sWASM_BIGINT=1 \
 		-msimd128 \
 		-o runtime.mjs
diff --git a/packages/umap-wasm/third_party/download_dependencies.sh b/packages/umap-wasm/third_party/download_dependencies.sh
index 6c3c636..21bfadf 100755
--- a/packages/umap-wasm/third_party/download_dependencies.sh
+++ b/packages/umap-wasm/third_party/download_dependencies.sh
@@ -69,5 +69,5 @@ download https://github.com/nmslib/hnswlib.git v0.8.0 hnswlib
 # BSD-2-Clause License
 download https://github.com/brj0/nndescent.git 514275f263be010712530a95e56ffc9b81b9110b nndescent
 pushd nndescent
-git apply ../nndescent.patch
+git apply ../nndescent.patch || true
 popd
diff --git a/scripts/build.sh b/scripts/build.sh
index fb9e08e..f53cd22 100755
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+# Build all JavaScript and Python packages
+
 set -euxo pipefail
 
 pushd packages/component
diff --git a/scripts/build_wasm.sh b/scripts/build_wasm.sh
new file mode 100755
index 0000000..dfc6881
--- /dev/null
+++ b/scripts/build_wasm.sh
@@ -0,0 +1,19 @@
+#!/bin/bash
+
+# Build WASM modules
+
+set -euxo pipefail
+
+pushd packages/density-clustering
+npm run build
+popd
+
+pushd packages/umap-wasm
+
+pushd third_party
+./download_dependencies.sh
+popd
+
+make
+
+popd
\ No newline at end of file