diff --git a/.github/workflows/Pipeline.yml b/.github/workflows/Pipeline.yml
index 7522ec6..69bfd97 100644
--- a/.github/workflows/Pipeline.yml
+++ b/.github/workflows/Pipeline.yml
@@ -50,8 +50,8 @@ jobs:
         id: variables
         run: |
           base_image_name="python"
-          base_image_os_version="12"
-          base_image_os_codename="Bookworm"
+          base_image_os_version="13"
+          base_image_os_codename="Trixie"
           base_image_os_size="-slim"
           base_image_py_version="3.14"
 
diff --git a/Dockerfile b/Dockerfile
index 448c2af..952ada8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -35,7 +35,7 @@ RUN ln -sf /bin/bash /bin/sh
 
 # Install MikTeX
 RUN curl -fsSL https://miktex.org/download/key | gpg --dearmor -o /usr/share/keyrings/miktex.gpg
-RUN echo "deb [signed-by=/usr/share/keyrings/miktex.gpg] https://miktex.org/download/debian bookworm universe" | tee /etc/apt/sources.list.d/miktex.list
+RUN echo "deb [signed-by=/usr/share/keyrings/miktex.gpg] https://miktex.org/download/debian ${MIKTEX_SRC_REPO} universe" | tee /etc/apt/sources.list.d/miktex.list
 # Install dependencies via apt-get
 RUN --mount=type=bind,target=/context \
     apt-get update \
diff --git a/README.md b/README.md
index bd0ac61..3accd32 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # MikTeX Docker Image
 
-This repository is based on [Debian 12.x Bookworm (slim) with Python 3.14](https://hub.docker.com/_/python).
+This repository is based on [Debian 13.x Trixie (slim) with Python 3.14](https://hub.docker.com/_/python).
 
 Docker Hub: https://hub.docker.com/r/pytooling/miktex