diff --git a/.changeset/monocle-nextjs-next-16.md b/.changeset/monocle-nextjs-next-16.md
new file mode 100644
index 0000000..89330c2
--- /dev/null
+++ b/.changeset/monocle-nextjs-next-16.md
@@ -0,0 +1,7 @@
+---
+"@spur.us/monocle-nextjs": minor
+---
+
+Accept Next.js 16 as a peer dependency.
+
+The declared range stopped at `^15.2.3`, so installing into a Next 16 project failed peer resolution and needed `--legacy-peer-deps`. The SDK already worked on Next 16 once installed; only the range was out of date.
diff --git a/packages/monocle-nextjs/package.json b/packages/monocle-nextjs/package.json
index dee0a6d..8a14fa3 100644
--- a/packages/monocle-nextjs/package.json
+++ b/packages/monocle-nextjs/package.json
@@ -48,7 +48,7 @@
     "@spur.us/monocle-react": "workspace:^"
   },
   "peerDependencies": {
-    "next": "^13.5.7 || ^14.2.25 || ^15.2.3",
+    "next": "^13.5.7 || ^14.2.25 || ^15.2.3 || ^16.0.0",
     "react": "catalog:peer-react",
     "react-dom": "catalog:peer-react"
   }
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 72fb245..a78fcdd 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -143,7 +143,7 @@ importers:
         specifier: workspace:^
         version: link:../monocle-react
       next:
-        specifier: ^13.5.7 || ^14.2.25 || ^15.2.3
+        specifier: ^13.5.7 || ^14.2.25 || ^15.2.3 || ^16.0.0
         version: 15.3.1(@babel/core@7.26.10)(react-dom@19.1.0(react@19.1.0))(react@19.1.0)
       react:
         specifier: catalog:peer-react
@@ -1950,6 +1950,7 @@ packages:
   next@15.3.1:
     resolution: {integrity: sha512-8+dDV0xNLOgHlyBxP1GwHGVaNXsmp+2NhZEYrXr24GWLHtt27YrBPbPuHvzlhi7kZNYjeJNR93IF5zfFu5UL0g==}
     engines: {node: ^18.18.0 || ^19.8.0 || >= 20.0.0}
+    deprecated: This version has a security vulnerability. Please upgrade to a patched version. See https://nextjs.org/blog/CVE-2025-66478 for more details.
     hasBin: true
     peerDependencies:
       '@opentelemetry/api': ^1.1.0