diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ce1e0f5..f320b31 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,12 +12,12 @@ jobs:
 
     steps:
       - uses: actions/checkout@v1
-      - name: Install Dependencies
-        run: sh ./install-deps.sh
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v3
         with:
           node-version: 20.x
+      - name: Install Dependencies
+        run: sh ./install-deps.sh
       - name: Install Node Modules
         run: make node_modules
       - name: Check Types
diff --git a/.github/workflows/test-release-build.yml b/.github/workflows/test-release-build.yml
new file mode 100644
index 0000000..403905d
--- /dev/null
+++ b/.github/workflows/test-release-build.yml
@@ -0,0 +1,32 @@
+name: test-release-build
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v3
+        with:
+          node-version: 20.x
+      - name: Install Dependencies
+        run: sh ./install-deps.sh
+      - name: Make a Temporary Version Number (if needed)
+        run: |
+          if [ -z "$(git tag --points-at=HEAD)" ]; then
+            node -e "x=`cat assets/manifest.json`; x.version='9999.99.9999'; console.log(JSON.stringify(x))" >assets/manifest.json.new
+            mv assets/manifest.json.new assets/manifest.json
+            make fix-style
+            git config --global user.name "GitHub Actions"
+            git config --global user.email "nobody@example.com"
+            git commit -m 'Make a temporary version number' assets/manifest.json
+          fi
+      - name: Try Building Release Artifacts
+        run: make rel
diff --git a/Makefile b/Makefile
index b0ac7b5..e674595 100644
--- a/Makefile
+++ b/Makefile
@@ -60,7 +60,13 @@ rel:
 rel-inner:
 	$(MAKE) pkg-webext pkg-source
 	$(MAKE) -C $(RELEASE_DIR)/$(SRCPKG_DIR) release-tag pkg-webext pkg-source
-	[ -z "$$(diff -Nru dist $(RELEASE_DIR)/$(SRCPKG_DIR)/dist)" ]
+	@if [ ! -z "$$(diff -Nru dist $(RELEASE_DIR)/$(SRCPKG_DIR)/dist)" ]; then \
+		diff -Nru dist $(RELEASE_DIR)/$(SRCPKG_DIR)/dist; \
+		echo "!!!" >&2; \
+		echo "!!! Build did not reproduce correctly; check diff output above" >&2; \
+		echo "!!!" >&2; \
+		exit 1; \
+	fi
 	rm -rf $(RELEASE_DIR)/$(SRCPKG_DIR)
 	@echo ""
 	@echo "Ready for release $(VERSION)!"
@@ -198,8 +204,9 @@ site:
 ## Cleanup
 
 distclean: clean
-	rm -rf node_modules $(RELEASE_DIR)/$(SRCPKG_DIR) $(SRC_PKG) $(DIST_PKG)
-	rm -rf docs/vendor
+	rm -rf node_modules docs/vendor \
+		$(RELEASE_DIR)/$(SRCPKG_DIR) $(SRC_PKG) $(DIST_PKG) \
+		releases/*-dirty* releases/*-dev*
 .PHONY: distclean
 
 clean:
diff --git a/install-deps.sh b/install-deps.sh
index 6069430..a0c3836 100755
--- a/install-deps.sh
+++ b/install-deps.sh
@@ -44,6 +44,9 @@ deps_apt() {
 
         sudo apt-get update
         sudo apt-get install -y nodejs
+
+    elif [ "$(node --version |cut -c2-3)" -lt $NODE_VERSION ]; then
+        die "Please upgrade Node.js to v$NODE_VERSION or later (you have $(node --version))."
     fi
 }