diff --git a/Dockerfile b/Dockerfile
index f862aac..d1a96e3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -12,6 +12,4 @@ FROM scratch
 COPY --from=builder /checker-ns-restrictions /checker-ns-restrictions
 USER 65534:65534
 EXPOSE 8080
-HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
-  CMD ["/checker-ns-restrictions", "-healthcheck"]
 ENTRYPOINT ["/checker-ns-restrictions"]
diff --git a/checker/rules_test.go b/checker/rules_test.go
index 04e0a07..3bb5cce 100644
--- a/checker/rules_test.go
+++ b/checker/rules_test.go
@@ -59,7 +59,7 @@ var rulesUnderTest = []struct {
 	errCode     string
 	skippedCode string
 	// resolutionRule emits a single OK state when there is no failure,
-	// not the "no probes" sentinel: it is the rule that owns the
+	// not the "no probes" sentinel — it is the rule that owns the
 	// resolution-error rows. Skip its no-probes test.
 	skipNoProbes bool
 }{
diff --git a/go.mod b/go.mod
index 36c2d7c..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 v1.5.0
+	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 2a80023..092728a 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,5 @@
-git.happydns.org/checker-sdk-go v1.5.0 h1:5uD5Cm6xJ+lwnhbJ09iCXGHbYS9zRh+Yh0NeBHkAPBY=
-git.happydns.org/checker-sdk-go v1.5.0/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=