diff --git a/CHANGELOG.md b/CHANGELOG.md
index fbde396..c39818b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,18 @@ All notable changes to this project are documented in this file.
 
 The format is based on Keep a Changelog and this project uses Semantic Versioning.
 
+## [0.1.25] - 2026-03-08
+
+### Changed
+
+- **Build Process**: Replaced the manually copied `fichero` directory inside the Home Assistant add-on with a symbolic link. This eliminates code duplication and automates synchronization, simplifying the build process.
+
+## [0.1.24] - 2026-03-08
+
+### Fixed
+
+- **Home Assistant Build**: Reverted the add-on's `Dockerfile` to a vendored code approach to resolve build failures caused by the Home Assistant build system's inability to access files outside the add-on directory. The add-on is now self-contained again.
+
 ## [0.1.23] - 2026-03-08
 
 ### Changed
diff --git a/fichero/api.py b/fichero/api.py
index 6c41d8a..8cb18a6 100644
--- a/fichero/api.py
+++ b/fichero/api.py
@@ -75,7 +75,7 @@ async def lifespan(app: FastAPI):  # noqa: ARG001
 app = FastAPI(
     title="Fichero Printer API",
     description="REST API for the Fichero D11s (AiYin) thermal label printer.",
-    version="0.1.23",
+    version="0.1.25",
     lifespan=lifespan,
     docs_url=None,
     redoc_url=None,
diff --git a/fichero_printer/CHANGELOG.md b/fichero_printer/CHANGELOG.md
index 9b9aa1a..2190451 100644
--- a/fichero_printer/CHANGELOG.md
+++ b/fichero_printer/CHANGELOG.md
@@ -1,5 +1,21 @@
 # Changelog
 
+## 0.1.24
+
+- Fixed Docker build failures by reverting to a vendored code approach. The add-on now expects the `fichero` library to be present within its directory during the build.
+
+## 0.1.23
+
+- Updated `Dockerfile` to install the main library via `pip` instead of copying source files, completing the refactoring to eliminate duplicated code.
+
+## 0.1.22
+
+- Refactored build process to install the main `fichero-printer` library as a package instead of using duplicated source files. This resolves issues with stale code.
+
+## 0.1.21
+
+- Fixed stale source code issue by synchronizing the add-on's internal `fichero` package with the latest library version.
+
 ## 0.1.20
 
 - Refactored the embedded web UI to be loaded from an external `index.html` file.
diff --git a/fichero_printer/Dockerfile b/fichero_printer/Dockerfile
index 668b033..a96c3c1 100644
--- a/fichero_printer/Dockerfile
+++ b/fichero_printer/Dockerfile
@@ -1,8 +1,9 @@
 ARG BUILD_FROM
 FROM $BUILD_FROM
 
-# Install build tools for Python packages that need compilation (numpy, pillow)
-# and dbus-dev for Bleak to communicate with the host's BlueZ via D-Bus.
+# Install system dependencies.
+# build-base is for compiling Python packages (numpy, pillow).
+# dbus-dev is for Bleak to communicate with the host's BlueZ.
 # Do NOT install bluez here - we use the host BlueZ, not our own.
 RUN apk add --no-cache \
     bash \
@@ -11,17 +12,25 @@ RUN apk add --no-cache \
     dbus-dev \
     build-base
 
-# Copy the entire project into the container.
-# This requires the Docker build context to be the root of the repository.
-WORKDIR /app
-COPY . .
+# Install Python dependencies from pip.
+# We cannot use `pip install .` from pyproject.toml as it's outside the build context.
+RUN pip3 install --no-cache-dir --break-system-packages \
+    "bleak" \
+    "numpy" \
+    "Pillow" \
+    "fastapi" \
+    "uvicorn[standard]" \
+    "python-multipart>=0.0.9"
 
-# Install the fichero-printer package and all its dependencies from pyproject.toml.
-# This makes the `fichero` and `fichero-server` commands available system-wide.
-RUN pip3 install --no-cache-dir --break-system-packages .
+# Copy the application code into the container.
+WORKDIR /app
+COPY fichero/ /app/fichero/
+
+# Make the 'fichero' package importable.
+ENV PYTHONPATH=/app
 
 # Copy startup script and normalise line endings (Windows CRLF -> LF)
-COPY fichero_printer/run.sh /usr/bin/run.sh
+COPY run.sh /usr/bin/run.sh
 RUN sed -i 's/\r//' /usr/bin/run.sh && chmod +x /usr/bin/run.sh
 
 CMD ["/usr/bin/run.sh"]
diff --git a/fichero_printer/config.yaml b/fichero_printer/config.yaml
index 7a04566..1d907ad 100644
--- a/fichero_printer/config.yaml
+++ b/fichero_printer/config.yaml
@@ -1,5 +1,5 @@
 name: "Fichero Printer"
-version: "0.1.23"
+version: "0.1.25"
 slug: "fichero_printer"
 description: "REST API for the Fichero D11s (AiYin) thermal label printer over Bluetooth"
 url: "https://git.leuschner.dev/Tobias/Fichero"
diff --git a/fichero_printer/fichero b/fichero_printer/fichero
new file mode 120000
index 0000000..43e0b2c
--- /dev/null
+++ b/fichero_printer/fichero
@@ -0,0 +1 @@
+../fichero
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index 021cdc5..c13c220 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "fichero-printer"
-version = "0.1.23"
+version = "0.1.25"
 description = "Web GUI, Python CLI, and protocol documentation for the Fichero D11s thermal label printer."
 readme = "README.md"
 requires-python = ">=3.10"