diff --git a/onnxoptimizer/test/ir_test.py b/onnxoptimizer/test/ir_test.py
new file mode 100644
index 000000000..455cb759c
--- /dev/null
+++ b/onnxoptimizer/test/ir_test.py
@@ -0,0 +1,16 @@
+# Copyright (c) ONNX Project Contributors
+#
+# SPDX-License-Identifier: Apache-2.0
+
+import onnx
+import onnx.backend.test.loader
+
+import onnxoptimizer
+
+
+def test_seq_type():
+    orig = onnx.load(
+        onnx.backend.test.loader.DATA_DIR + "/node/test_sequence_insert_at_back/model.onnx"
+    )
+    optimized = onnxoptimizer.optimize(orig)
+    assert optimized.graph.input[0].type == orig.graph.input[0].type
diff --git a/third_party/onnx b/third_party/onnx
index 9c31fa6d3..82d3af2e7 160000
--- a/third_party/onnx
+++ b/third_party/onnx
@@ -1 +1 @@
-Subproject commit 9c31fa6d39400d444c6b1a4de2a247ad32174f63
+Subproject commit 82d3af2e77e15207b9e753b35d17141c208e840a