diff --git a/.changeset/cjs-dual-builds.md b/.changeset/cjs-dual-builds.md
new file mode 100644
index 000000000..e85f418af
--- /dev/null
+++ b/.changeset/cjs-dual-builds.md
@@ -0,0 +1,13 @@
+---
+'@modelcontextprotocol/server': minor
+'@modelcontextprotocol/client': minor
+'@modelcontextprotocol/core': minor
+'@modelcontextprotocol/server-legacy': minor
+'@modelcontextprotocol/codemod': minor
+'@modelcontextprotocol/express': minor
+'@modelcontextprotocol/hono': minor
+'@modelcontextprotocol/fastify': minor
+'@modelcontextprotocol/node': minor
+---
+
+Ship CommonJS builds alongside ESM for all v2 packages, so `require()` consumers and CJS-only toolchains can use the SDK without a bundler shim.
diff --git a/.changeset/codemod-iterations-5.md b/.changeset/codemod-iterations-5.md
new file mode 100644
index 000000000..fe6f5e849
--- /dev/null
+++ b/.changeset/codemod-iterations-5.md
@@ -0,0 +1,5 @@
+---
+'@modelcontextprotocol/codemod': patch
+---
+
+v1-to-v2 migration fixes from continued real-world migrations (codemod iterations 5).