diff --git a/.gitea/workflows/release-keeper-ziren.yml b/.gitea/workflows/release-keeper-ziren.yml
new file mode 100644
index 0000000000..63557b52dc
--- /dev/null
+++ b/.gitea/workflows/release-keeper-ziren.yml
@@ -0,0 +1,31 @@
+on:
+  push:
+    branches:
+      - "master"
+    tags:
+      - "v*"
+  workflow_dispatch:
+
+jobs:
+  keeper-ziren:
+    name: Keeper ZKVM Build
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up Go
+      uses: actions/setup-go@v5
+      with:
+        go-version: 1.25
+        cache: false
+
+    - name: Install cross toolchain for MIPS
+      run: |
+        apt-get update
+        apt-get -yq --no-install-suggests --no-install-recommends install gcc-mipsel-linux-gnu libc6-dev-mipsel-cross
+
+    - name: Build keeper with ziren tag (mipsle)
+      run: |
+        go run build/ci.go install -static -arch mipsle -os linux -cc mipsel-linux-gnu-gcc -tags ziren -dlgo ./cmd/keeper
+      env:
+        GOMIPS: "softfloat"
diff --git a/build/ci.go b/build/ci.go
index 6a9848876d..500e204b68 100644
--- a/build/ci.go
+++ b/build/ci.go
@@ -183,14 +183,16 @@ func doInstall(cmdline []string) {
 	var (
 		dlgo       = flag.Bool("dlgo", false, "Download Go and build with it")
 		arch       = flag.String("arch", "", "Architecture to cross build for")
+		goos       = flag.String("os", "", "Operating system to cross build for")
 		cc         = flag.String("cc", "", "C compiler to cross build with")
 		staticlink = flag.Bool("static", false, "Create statically-linked executable")
+		tags       = flag.String("tags", "", "Additional build tags (comma-separated)")
 	)
 	flag.CommandLine.Parse(cmdline)
 	env := build.Env()
 
 	// Configure the toolchain.
-	tc := build.GoToolchain{GOARCH: *arch, CC: *cc}
+	tc := build.GoToolchain{GOARCH: *arch, GOOS: *goos, CC: *cc}
 	if *dlgo {
 		csdb := download.MustLoadChecksums("build/checksums.txt")
 		tc.Root = build.DownloadGo(csdb)
@@ -203,6 +205,20 @@ func doInstall(cmdline []string) {
 		buildTags = append(buildTags, "ckzg")
 	}
 
+	// Add custom tags if provided
+	if *tags != "" {
+		// Split by both comma and whitespace
+		customTags := strings.FieldsFunc(*tags, func(r rune) bool {
+			return r == ',' || r == ' ' || r == '\t'
+		})
+		for _, tag := range customTags {
+			tag = strings.TrimSpace(tag)
+			if tag != "" {
+				buildTags = append(buildTags, tag)
+			}
+		}
+	}
+
 	// Configure the build.
 	gobuild := tc.Go("build", buildFlags(env, *staticlink, buildTags)...)