diff --git a/3rd/msgpack/src/bindings.c b/3rd/msgpack/src/bindings.c
index 99f28c9b..bfc0396b 100644
--- a/3rd/msgpack/src/bindings.c
+++ b/3rd/msgpack/src/bindings.c
@@ -56,8 +56,10 @@ static bool mpack_to_py(mpack_node_t node) {
             for(size_t i = 0; i < count; i++) {
                 mpack_node_t key_node = mpack_node_map_key_at(node, i);
                 mpack_node_t val_node = mpack_node_map_value_at(node, i);
-                if(mpack_node_type(key_node) != mpack_type_str) {
-                    return TypeError("msgpack: key must be strings");
+                mpack_type_t key_type = mpack_node_type(key_node);
+                if(key_type != mpack_type_str && key_type != mpack_type_int &&
+                   key_type != mpack_type_uint) {
+                    return TypeError("msgpack: key must be string or integer");
                 }
                 if(!mpack_to_py(key_node)) return false;
                 if(!mpack_to_py(val_node)) return false;
@@ -101,9 +103,14 @@ static bool py_to_mpack(py_Ref object, mpack_writer_t* writer);
 
 static bool mpack_write_dict_kv(py_Ref k, py_Ref v, void* ctx) {
     mpack_writer_t* writer = ctx;
-    if(k->type != tp_str) return TypeError("msgpack: key must be strings");
-    c11_sv sv = py_tosv(k);
-    mpack_write_str(writer, sv.data, (size_t)sv.size);
+    if(k->type == tp_str) {
+        c11_sv sv = py_tosv(k);
+        mpack_write_str(writer, sv.data, (size_t)sv.size);
+    } else if(k->type == tp_int) {
+        mpack_write_int(writer, py_toint(k));
+    } else {
+        return TypeError("msgpack: key must be string or integer");
+    }
     bool ok = py_to_mpack(v, writer);
     if(!ok) mpack_write_nil(writer);
     return ok;
@@ -160,7 +167,10 @@ static bool msgpack_dumps(int argc, py_Ref argv) {
     mpack_writer_init_growable(&writer, &data, &size);
     bool ok = py_to_mpack(argv, &writer);
     if(mpack_writer_destroy(&writer) != mpack_ok) { assert(false); }
-    if(!ok) return false;
+    if(!ok) {
+        MPACK_FREE(data);
+        return false;
+    }
     assert(size <= INT32_MAX);
     unsigned char* byte_data = py_newbytes(py_retval(), (int)size);
     memcpy(byte_data, data, size);