diff --git a/CLAUDE.md b/CLAUDE.md
index ebd7180..780c99f 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -184,8 +184,11 @@ WASM target configured with `-DNAJA_SCHEMATIC_WASM_MODULE=ON` (single file,
 wasm inlined, `createNajaSchematic({canvas, ...})` factory, one instance per
 canvas), built by `.github/workflows/python-package.yml`, which also tests
 the wheel and publishes it to PyPI on a `v<version>` tag (version in
-`naja_schematic/__init__.py`). For local work set `NAJA_SCHEMATIC_BUNDLE` to
-a locally built bundle (see `_bundle.py`). Tests: `pytest python/tests`.
+`naja_schematic/__init__.py`, the project's single version: `CMakeLists.txt`
+also reads it into `NAJA_SCHEMATIC_VERSION_STRING` for the C++ app's About
+dialog, so a release is one edit plus a tag). For local work set
+`NAJA_SCHEMATIC_BUNDLE` to a locally built bundle (see `_bundle.py`). Tests:
+`pytest python/tests`.
 
 ## Architecture
 
diff --git a/CMakeLists.txt b/CMakeLists.txt
index c0e7d5a..24a8d3b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -21,6 +21,21 @@ else()
 endif()
 message(STATUS "naja-schematic commit: ${NAJA_SCHEMATIC_GIT_HASH}")
 
+# ------------------------------------------------------------
+# naja-schematic version: single source of truth is the Python package's
+# __version__ (what hatch builds the wheel from and CI checks the release
+# tag against), so the app's About dialog can't drift from the release
+# ------------------------------------------------------------
+file(STRINGS ${CMAKE_SOURCE_DIR}/python/naja_schematic/__init__.py
+  NAJA_SCHEMATIC_VERSION_LINE REGEX "^__version__ = \"[^\"]*\"")
+string(REGEX REPLACE ".*\"([^\"]*)\".*" "\\1" NAJA_SCHEMATIC_VERSION
+  "${NAJA_SCHEMATIC_VERSION_LINE}")
+if(NOT NAJA_SCHEMATIC_VERSION)
+  message(FATAL_ERROR
+    "Could not read __version__ from python/naja_schematic/__init__.py")
+endif()
+message(STATUS "naja-schematic version: ${NAJA_SCHEMATIC_VERSION}")
+
 # ------------------------------------------------------------
 # naja version (read from the submodule's literal, not built — needed on
 # both targets since both interface with naja: native links it directly,
@@ -149,6 +164,7 @@ if(EMSCRIPTEN_BUILD)
   set_target_properties(naja-schematic  PROPERTIES SUFFIX ${NAJA_SCHEMATIC_WASM_SUFFIX})
   target_compile_definitions(naja-schematic PRIVATE
     NAJA_SCHEMATIC_GIT_HASH="${NAJA_SCHEMATIC_GIT_HASH}"
+    NAJA_SCHEMATIC_VERSION_STRING="${NAJA_SCHEMATIC_VERSION}"
     NAJA_VERSION_STRING="${NAJA_VERSION}"
   )
 
@@ -198,6 +214,7 @@ else()
 
   target_compile_definitions(naja-schematic-standalone PRIVATE
     NAJA_SCHEMATIC_GIT_HASH="${NAJA_SCHEMATIC_GIT_HASH}"
+    NAJA_SCHEMATIC_VERSION_STRING="${NAJA_SCHEMATIC_VERSION}"
     NAJA_VERSION_STRING="${NAJA_VERSION}"
   )
 
diff --git a/python/naja_schematic/__init__.py b/python/naja_schematic/__init__.py
index 23f7619..ff38956 100644
--- a/python/naja_schematic/__init__.py
+++ b/python/naja_schematic/__init__.py
@@ -5,6 +5,8 @@
 - From a shell: ``naja-schematic --verilog design.v --open`` serves the
   viewer page and opens it in a browser.
 """
+# Single version for the whole project: CMakeLists.txt reads this line into the
+# C++ app too (NAJA_SCHEMATIC_VERSION_STRING), so keep it a plain literal.
 __version__ = "0.1.1"
 
 from .protocol import diagnosis_response, handle_request
diff --git a/src/AppLogic.cpp b/src/AppLogic.cpp
index 26439f5..dfdec57 100644
--- a/src/AppLogic.cpp
+++ b/src/AppLogic.cpp
@@ -26,7 +26,6 @@ using json = nlohmann::json;
 #include "SelectionStore.h"
 #include "PropertiesView.h"
 #include "DroidSansFont.h"
-#include "Version.h"
 
 #ifndef __EMSCRIPTEN__
 #include <fstream>
@@ -721,7 +720,7 @@ bool appFrame(AppState& state) {
     ImGui::Separator();
     ImGui::Spacing();
 
-    ImGui::Text("Version: %s", naja_schematic::VERSION.c_str());
+    ImGui::Text("Version: %s", NAJA_SCHEMATIC_VERSION_STRING);
     ImGui::Text("Commit:  %s", NAJA_SCHEMATIC_GIT_HASH);
     ImGui::Text("naja:    %s", NAJA_VERSION_STRING);
     ImGui::Text("Project: github.com/najaeda/naja-schematic");
diff --git a/src/Version.h b/src/Version.h
deleted file mode 100644
index e0155c7..0000000
--- a/src/Version.h
+++ /dev/null
@@ -1,36 +0,0 @@
-#pragma once
-
-#include <string>
-
-// Mirrors thirdparty/naja/src/core/NajaVersion.h: a literal MAJOR.MINOR.PATCH
-// string plus helpers to split it, kept separate from the git commit hash
-// (NAJA_SCHEMATIC_GIT_HASH, baked in as a compile definition by CMakeLists.txt
-// since it changes every commit, unlike this literal).
-namespace naja_schematic {
-
-namespace detail {
-
-inline std::string getVersionPart(const std::string& version, int index) {
-  std::string::size_type start = 0;
-  for (int i = 0; i < index; ++i) {
-    std::string::size_type dot = version.find('.', start);
-    if (dot == std::string::npos) {
-      return std::string {};
-    }
-    start = dot + 1;
-  }
-  std::string::size_type end = version.find('.', start);
-  if (end == std::string::npos) {
-    end = version.size();
-  }
-  return version.substr(start, end - start);
-}
-
-} // namespace detail
-
-const std::string VERSION { "0.0.6" };
-const std::string VERSION_MAJOR { detail::getVersionPart(VERSION, 0) };
-const std::string VERSION_MINOR { detail::getVersionPart(VERSION, 1) };
-const std::string VERSION_PATCH { detail::getVersionPart(VERSION, 2) };
-
-} // namespace naja_schematic