diff --git a/.changeset/fix-core-zod-dup-deps.md b/.changeset/fix-core-zod-dup-deps.md
new file mode 100644
index 000000000..930c0c37c
--- /dev/null
+++ b/.changeset/fix-core-zod-dup-deps.md
@@ -0,0 +1,5 @@
+---
+'@modelcontextprotocol/core': patch
+---
+
+Remove `zod` from `dependencies` in `@modelcontextprotocol/core` and keep it only as a peer dependency to avoid duplicate installs that can cause TypeScript type incompatibilities.
diff --git a/packages/core/package.json b/packages/core/package.json
index 201773736..6ddac49c6 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -51,8 +51,7 @@
     "dependencies": {
         "ajv": "catalog:runtimeShared",
         "ajv-formats": "catalog:runtimeShared",
-        "json-schema-typed": "catalog:runtimeShared",
-        "zod": "catalog:runtimeShared"
+        "json-schema-typed": "catalog:runtimeShared"
     },
     "peerDependencies": {
         "@cfworker/json-schema": "catalog:runtimeShared",