diff --git a/VERSION_NUMBER b/VERSION_NUMBER
index 0eed1a29efd..feaae22bac7 100644
--- a/VERSION_NUMBER
+++ b/VERSION_NUMBER
@@ -1 +1 @@
-1.12.0
+1.13.0
diff --git a/docs/Versioning.md b/docs/Versioning.md
index d7dee22cef3..2a8492bf0c6 100644
--- a/docs/Versioning.md
+++ b/docs/Versioning.md
@@ -180,6 +180,7 @@ ONNX version|IR version|Opset version ai.onnx|Opset version ai.onnx.ml|Opset ver
 1.10.2|8|15|2|1
 1.11.0|8|16|3|1
 1.12.0|8|17|3|1
+1.13.0|8|18|3|1
 
 A programmatically accessible version of the above table is available [here](../onnx/helper.py). Limited version number
 information is also maintained in [version.h](../onnx/common/version.h) and [schema.h](../onnx/defs/schema.h).
diff --git a/onnx/common/version.h b/onnx/common/version.h
index 62486766baa..cf826fc5f68 100644
--- a/onnx/common/version.h
+++ b/onnx/common/version.h
@@ -7,6 +7,6 @@
 namespace ONNX_NAMESPACE {
 
 // Represents the most recent release version. Updated with every release.
-constexpr const char* LAST_RELEASE_VERSION = "1.12.0";
+constexpr const char* LAST_RELEASE_VERSION = "1.13.0";
 
 } // namespace ONNX_NAMESPACE
diff --git a/onnx/defs/schema.h b/onnx/defs/schema.h
index 0f53365f6a8..b8808ac3cf7 100644
--- a/onnx/defs/schema.h
+++ b/onnx/defs/schema.h
@@ -976,7 +976,7 @@ class OpSchemaRegistry final : public ISchemaRegistry {
       // Version corresponding last release of ONNX. Update this to match with
       // the max version above in a *release* version of ONNX. But in other
       // versions, the max version may be ahead of the last-release-version.
-      last_release_version_map_[ONNX_DOMAIN] = 17;
+      last_release_version_map_[ONNX_DOMAIN] = 18;
       last_release_version_map_[AI_ONNX_ML_DOMAIN] = 3;
       last_release_version_map_[AI_ONNX_TRAINING_DOMAIN] = 1;
       last_release_version_map_[AI_ONNX_PREVIEW_TRAINING_DOMAIN] = 1;
diff --git a/onnx/helper.py b/onnx/helper.py
index 2da8271473a..b320356b58a 100644
--- a/onnx/helper.py
+++ b/onnx/helper.py
@@ -67,6 +67,7 @@
     ("1.10.2", 8, 15, 2, 1),
     ("1.11.0", 8, 16, 3, 1),
     ("1.12.0", 8, 17, 3, 1),
+    ("1.13.0", 8, 18, 3, 1),
 ]
 
 VersionMapType = Dict[Tuple[str, int], int]
diff --git a/onnx/test/helper_test.py b/onnx/test/helper_test.py
index 754ce16deb0..a357535c380 100644
--- a/onnx/test/helper_test.py
+++ b/onnx/test/helper_test.py
@@ -386,6 +386,7 @@ def test(opset_versions: List[Tuple[str, int]], ir_version: int) -> None:
         test([("", 15)], 8)
         test([("", 16)], 8)
         test([("", 17)], 8)
+        test([("", 18)], 8)
         # standard opset can be referred to using empty-string or "ai.onnx"
         test([("ai.onnx", 9)], 4)
         test([("ai.onnx.ml", 2)], 6)