diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index 458cfd24..ae77fe51 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -167,7 +167,7 @@ jobs:
       - name: Install Node.js
         uses: actions/setup-node@v2
         with:
-          node-version: '12'
+          node-version: '14'
       - name: Install wasmtime
         run: |
           curl https://wasmtime.dev/install.sh -sSf | bash
diff --git a/Makefile b/Makefile
index 15680433..9f56bf5b 100644
--- a/Makefile
+++ b/Makefile
@@ -234,7 +234,7 @@ endif
 wasi-libc: lib/wasi-libc/sysroot/lib/wasm32-wasi/libc.a
 lib/wasi-libc/sysroot/lib/wasm32-wasi/libc.a:
 	@if [ ! -e lib/wasi-libc/Makefile ]; then echo "Submodules have not been downloaded. Please download them using:\n  git submodule update --init"; exit 1; fi
-	cd lib/wasi-libc && make -j4 WASM_CFLAGS="-O2 -g -DNDEBUG" MALLOC_IMPL=none CC=$(CLANG) AR=$(LLVM_AR) NM=$(LLVM_NM)
+	cd lib/wasi-libc && make -j4 WASM_CFLAGS="-O2 -g -DNDEBUG -mnontrapping-fptoint -msign-ext" MALLOC_IMPL=none CC=$(CLANG) AR=$(LLVM_AR) NM=$(LLVM_NM)
 
 
 # Build the Go compiler.
diff --git a/targets/wasi.json b/targets/wasi.json
index 8ff4c3a2..64d86469 100644
--- a/targets/wasi.json
+++ b/targets/wasi.json
@@ -1,6 +1,7 @@
 {
 	"llvm-target":   "wasm32-unknown-wasi",
 	"cpu":           "generic",
+	"features":      "+bulk-memory,+nontrapping-fptoint,+sign-ext",
 	"build-tags":    ["tinygo.wasm", "wasi"],
 	"goos":          "linux",
 	"goarch":        "arm",
@@ -8,6 +9,11 @@
 	"libc":          "wasi-libc",
 	"scheduler":     "asyncify",
 	"default-stack-size": 16384,
+	"cflags": [
+		"-mbulk-memory",
+		"-mnontrapping-fptoint",
+		"-msign-ext"
+	],
 	"ldflags": [
 		"--allow-undefined",
 		"--stack-first",
diff --git a/targets/wasm.json b/targets/wasm.json
index 1cc3410d..c668a68c 100644
--- a/targets/wasm.json
+++ b/targets/wasm.json
@@ -1,6 +1,7 @@
 {
 	"llvm-target":   "wasm32-unknown-wasi",
 	"cpu":           "generic",
+	"features":      "+bulk-memory,+nontrapping-fptoint,+sign-ext",
 	"build-tags":    ["tinygo.wasm"],
 	"goos":          "js",
 	"goarch":        "wasm",
@@ -8,6 +9,11 @@
 	"libc":          "wasi-libc",
 	"scheduler":     "asyncify",
 	"default-stack-size": 16384,
+	"cflags": [
+		"-mbulk-memory",
+		"-mnontrapping-fptoint",
+		"-msign-ext"
+	],
 	"ldflags": [
 		"--allow-undefined",
 		"--stack-first",