diff --git a/.gitea/workflows/release.yaml b/.gitea/workflows/release.yaml
index 3cbe68c..4a8d71b 100644
--- a/.gitea/workflows/release.yaml
+++ b/.gitea/workflows/release.yaml
@@ -29,9 +29,11 @@ jobs:
           git clone "${{ gitea.server_url }}/${{ gitea.repository }}.git" .
           git checkout -f "${{ gitea.sha }}"
 
+      # guibuild.py carries its own inline (PEP 723) deps — mediahive[gui]
+      # from the local checkout — so no project sync or --extra is needed.
       - name: Build GUI app and dist packages
         shell: ${{ matrix.shell }}
-        run: uv run --extra gui scripts/guibuild.py
+        run: uv run scripts/guibuild.py
 
       # Every platform converges on the one release for the tag; release.py
       # reuses an existing release and skips already-uploaded assets.
@@ -43,18 +45,33 @@ jobs:
           GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
         run: uv run scripts/release.py
 
-      # Wheel/sdist are platform-independent; the linux job also pushes them
-      # to PyPI. Token is the PYPI_TOKEN repository secret.
-      - name: Publish to PyPI
-        if: matrix.os == 'linux'
-        shell: ${{ matrix.shell }}
-        env:
-          UV_PUBLISH_TOKEN: ${{ secrets.PYPI_TOKEN }}
-        run: uv publish
-
       - name: Attach platform artifact to the Gitea release
         if: matrix.os != 'linux'
         shell: ${{ matrix.shell }}
         env:
           GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
         run: uv run scripts/release.py --no-dist
+
+  # Publish the Python package to PyPI only once every platform's GUI build
+  # has succeeded. Jobs don't share a workspace, so the platform-independent
+  # wheel/sdist are rebuilt here (same tag version) instead of being passed
+  # around as artifacts.
+  publish-pypi:
+    needs: gui-build
+    runs-on: linux
+    steps:
+      - name: Checkout
+        shell: bash
+        run: |
+          git clone "${{ gitea.server_url }}/${{ gitea.repository }}.git" .
+          git checkout -f "${{ gitea.sha }}"
+
+      - name: Build wheel and sdist
+        shell: bash
+        run: uv build
+
+      - name: Publish to PyPI
+        shell: bash
+        env:
+          UV_PUBLISH_TOKEN: ${{ secrets.PYPI_TOKEN }}
+        run: uv publish
diff --git a/pyproject.toml b/pyproject.toml
index 5382fb0..e7e924c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -58,6 +58,8 @@ gui = [
     "velopack>=1.2",
     "pythonnet>=3.1.0rc0; platform_system == 'Windows' and python_version >= '3.14'",
     "pyinstaller>=6.0",
+    # scripts/guibuild.py reads the version with it (same logic as hatch-vcs).
+    "setuptools_scm>=8",
 ]
 
 [dependency-groups]
diff --git a/scripts/guibuild.py b/scripts/guibuild.py
index b4587ca..508d46a 100755
--- a/scripts/guibuild.py
+++ b/scripts/guibuild.py
@@ -1,11 +1,20 @@
 #!/usr/bin/env -S uv run
+# /// script
+# requires-python = ">=3.14"
+# dependencies = [
+#     "mediahive[gui]",
+# ]
+#
+# [tool.uv.sources]
+# mediahive = { path = "../" }
+# ///
 """Build the desktop GUI application and package it with Velopack.
 
 Usage:
     uv run scripts/guibuild.py
 
-This runs in the project environment where dependencies
-are available via pyproject.toml.
+Self-contained: inline script dependencies above make uv resolve the
+package (with the gui extra) plus this script's own direct imports.
 
 This script:
     1. Reads the version from pyproject.toml