diff --git a/Dockerfile b/Dockerfile
index c502d63..1acc55f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,7 +6,7 @@ WORKDIR /src
 COPY go.mod go.sum ./
 RUN go mod download
 COPY . .
-RUN CGO_ENABLED=0 go build -ldflags "-X main.Version=${CHECKER_VERSION}" -o /checker-ns-restrictions .
+RUN CGO_ENABLED=0 go build -tags standalone -ldflags "-X main.Version=${CHECKER_VERSION}" -o /checker-ns-restrictions .
 
 FROM scratch
 COPY --from=builder /checker-ns-restrictions /checker-ns-restrictions
diff --git a/Makefile b/Makefile
index 7324d03..2c0872e 100644
--- a/Makefile
+++ b/Makefile
@@ -6,12 +6,12 @@ CHECKER_SOURCES := main.go $(wildcard checker/*.go)
 
 GO_LDFLAGS := -X main.Version=$(CHECKER_VERSION)
 
-.PHONY: all plugin docker clean
+.PHONY: all plugin docker test clean
 
 all: $(CHECKER_NAME)
 
 $(CHECKER_NAME): $(CHECKER_SOURCES)
-	go build -ldflags "$(GO_LDFLAGS)" -o $@ .
+	go build -tags standalone -ldflags "$(GO_LDFLAGS)" -o $@ .
 
 plugin: $(CHECKER_NAME).so
 
@@ -21,5 +21,8 @@ $(CHECKER_NAME).so: $(CHECKER_SOURCES) $(wildcard plugin/*.go)
 docker:
 	docker build --build-arg CHECKER_VERSION=$(CHECKER_VERSION) -t $(CHECKER_IMAGE) .
 
+test:
+	go test -tags standalone ./...
+
 clean:
 	rm -f $(CHECKER_NAME) $(CHECKER_NAME).so
diff --git a/checker/collect.go b/checker/collect.go
index 7ab9990..0a81567 100644
--- a/checker/collect.go
+++ b/checker/collect.go
@@ -63,7 +63,7 @@ func (p *nsProvider) Collect(ctx context.Context, opts sdk.CheckerOptions) (any,
 
 // serviceFromOptions extracts a *serviceMessage from the options. It accepts
 // either a direct value (in-process plugin path) or a JSON-decoded
-// map[string]any (HTTP path) — both are normalized via a JSON round-trip.
+// map[string]any (HTTP path), both are normalized via a JSON round-trip.
 func serviceFromOptions(opts sdk.CheckerOptions) (*serviceMessage, error) {
 	v, ok := opts["service"]
 	if !ok {
diff --git a/checker/interactive.go b/checker/interactive.go
index d7de7c8..3506d22 100644
--- a/checker/interactive.go
+++ b/checker/interactive.go
@@ -1,3 +1,5 @@
+//go:build standalone
+
 package checker
 
 import (
@@ -11,7 +13,7 @@ import (
 	"github.com/miekg/dns"
 )
 
-// RenderForm implements sdk.CheckerInteractive. It lists the minimal human
+// RenderForm implements server.Interactive. It lists the minimal human
 // inputs needed to bootstrap a check when this checker runs standalone
 // (outside of a happyDomain host).
 func (p *nsProvider) RenderForm() []sdk.CheckerOptionField {
@@ -27,9 +29,9 @@ func (p *nsProvider) RenderForm() []sdk.CheckerOptionField {
 	}
 }
 
-// ParseForm implements sdk.CheckerInteractive. It resolves the NS records
+// ParseForm implements server.Interactive. It resolves the NS records
 // for the requested domain via DNS and assembles the CheckerOptions that
-// Collect expects — replacing the AutoFill work that happyDomain would
+// Collect expects, replacing the AutoFill work that happyDomain would
 // otherwise perform.
 func (p *nsProvider) ParseForm(r *http.Request) (sdk.CheckerOptions, error) {
 	domain := strings.TrimSpace(r.FormValue("domain"))
diff --git a/go.mod b/go.mod
index 906fafe..63525b0 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module git.happydns.org/checker-ns-restrictions
 go 1.25.0
 
 require (
-	git.happydns.org/checker-sdk-go v1.2.0
+	git.happydns.org/checker-sdk-go v1.3.0
 	github.com/miekg/dns v1.1.72
 )
 
diff --git a/go.sum b/go.sum
index d64ca7c..092728a 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,5 @@
-git.happydns.org/checker-sdk-go v1.2.0 h1:v4MpKAz0W3PwP+bxx3pya8w893sVH5xTD1of1cc0TV8=
-git.happydns.org/checker-sdk-go v1.2.0/go.mod h1:aNAcfYFfbhvH9kJhE0Njp5GX0dQbxdRB0rJ0KvSC5nI=
+git.happydns.org/checker-sdk-go v1.3.0 h1:FG2kIhlJCzI0m35EhxSgn4UWc9M4ha6aZTeoChu4l7A=
+git.happydns.org/checker-sdk-go v1.3.0/go.mod h1:aNAcfYFfbhvH9kJhE0Njp5GX0dQbxdRB0rJ0KvSC5nI=
 github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/miekg/dns v1.1.72 h1:vhmr+TF2A3tuoGNkLDFK9zi36F2LS+hKTRW0Uf8kbzI=
diff --git a/main.go b/main.go
index 2ea54aa..1b3419f 100644
--- a/main.go
+++ b/main.go
@@ -5,7 +5,7 @@ import (
 	"log"
 
 	nsr "git.happydns.org/checker-ns-restrictions/checker"
-	sdk "git.happydns.org/checker-sdk-go/checker"
+	"git.happydns.org/checker-sdk-go/checker/server"
 )
 
 // Version is the standalone binary's version. It defaults to "custom-build"
@@ -23,8 +23,8 @@ func main() {
 	// CheckerDefinition.Version.
 	nsr.Version = Version
 
-	server := sdk.NewServer(nsr.Provider())
-	if err := server.ListenAndServe(*listenAddr); err != nil {
+	srv := server.New(nsr.Provider())
+	if err := srv.ListenAndServe(*listenAddr); err != nil {
 		log.Fatalf("server error: %v", err)
 	}
 }