diff --git a/include/pybind11/detail/common.h b/include/pybind11/detail/common.h
index 9418334ca..a1527204d 100644
--- a/include/pybind11/detail/common.h
+++ b/include/pybind11/detail/common.h
@@ -9,13 +9,13 @@
 
 #pragma once
 
-#define PYBIND11_VERSION_MAJOR 2
-#define PYBIND11_VERSION_MINOR 14
+#define PYBIND11_VERSION_MAJOR 3
+#define PYBIND11_VERSION_MINOR 0
 #define PYBIND11_VERSION_PATCH 0.dev1
 
 // Similar to Python's convention: https://docs.python.org/3/c-api/apiabiversion.html
 // Additional convention: 0xD = dev
-#define PYBIND11_VERSION_HEX 0x020E00D1
+#define PYBIND11_VERSION_HEX 0x030000D1
 
 // Define some generic pybind11 helper macros for warning management.
 //
diff --git a/include/pybind11/detail/internals.h b/include/pybind11/detail/internals.h
index 560fe5f79..1b398a83c 100644
--- a/include/pybind11/detail/internals.h
+++ b/include/pybind11/detail/internals.h
@@ -36,12 +36,14 @@
 /// further ABI-incompatible changes may be made before the ABI is officially
 /// changed to the new version.
 #ifndef PYBIND11_INTERNALS_VERSION
-#    if PY_VERSION_HEX >= 0x030C0000 || defined(_MSC_VER)
+#    if PYBIND11_VERSION_MAJOR >= 3
+#        define PYBIND11_INTERNALS_VERSION 6
+#    elif PY_VERSION_HEX >= 0x030C0000 || defined(_MSC_VER)
 // Version bump for Python 3.12+, before first 3.12 beta release.
 // Version bump for MSVC piggy-backed on PR #4779. See comments there.
-#        define PYBIND11_INTERNALS_VERSION 6 // BAKEIN_WIP: Only do this for pybind11 v3.0.0
+#        define PYBIND11_INTERNALS_VERSION 5
 #    else
-#        define PYBIND11_INTERNALS_VERSION 6 // BAKEIN_WIP: Only do this for pybind11 v3.0.0
+#        define PYBIND11_INTERNALS_VERSION 4
 #    endif
 #endif
 
diff --git a/pybind11/_version.py b/pybind11/_version.py
index c5cc1a0b0..2dfe67616 100644
--- a/pybind11/_version.py
+++ b/pybind11/_version.py
@@ -8,5 +8,5 @@ def _to_int(s: str) -> int | str:
         return s
 
 
-__version__ = "2.14.0.dev1"
+__version__ = "3.0.0.dev1"
 version_info = tuple(_to_int(s) for s in __version__.split("."))