diff --git a/.github/docker/Dockerfile_alpine-3-20-2 b/.github/docker/Dockerfile_alpine-3-20-2
new file mode 100644
index 0000000..790bf72
--- /dev/null
+++ b/.github/docker/Dockerfile_alpine-3-20-2
@@ -0,0 +1,40 @@
+FROM hexpm/elixir:1.17.2-erlang-26.2.5.2-alpine-3.20.2
+
+USER root
+
+RUN apk update \
+  && apk add --no-cache \
+    # Will install chromium 128.0.6613.119 & ghostscript 10.03.1
+    chromium \
+    ghostscript \
+    # for verapdf & ZUV
+    openjdk11-jre \
+    # for pdftotext & friends
+    poppler-utils \
+    # for identifying images
+    imagemagick \
+    # for 'kill'
+    procps \
+    # temporary for installation below
+    wget \
+    unzip \
+    # GNU tar needed by actions/cache
+    tar
+
+RUN mkdir /opt/verapdf
+WORKDIR /opt/verapdf
+RUN wget http://downloads.verapdf.org/rel/verapdf-installer.zip \
+  && unzip verapdf-installer.zip \
+  && mv verapdf-greenfield* verapdf-greenfield \
+  && chmod +x verapdf-greenfield/verapdf-install
+COPY .github/docker/auto-install.xml /opt/verapdf/verapdf-greenfield
+RUN ./verapdf-greenfield/verapdf-install auto-install.xml
+
+WORKDIR /opt/zuv
+RUN wget https://github.com/ZUGFeRD/ZUV/releases/download/v0.8.3/ZUV-0.8.3.jar
+ENV ZUV_JAR /opt/zuv/ZUV-0.8.3.jar
+
+RUN apk del \
+    wget \
+    unzip \
+	&& rm -rf /var/lib/apt/lists/*
diff --git a/.github/workflows/publish-image.yml b/.github/workflows/publish-image.yml
index 3f9c00b..04f1b3e 100644
--- a/.github/workflows/publish-image.yml
+++ b/.github/workflows/publish-image.yml
@@ -31,7 +31,7 @@ jobs:
       packages: write
     strategy:
       matrix:
-        dockerfile: ['elixir-1-11', 'debian-buster', 'alpine-3-17-3', 'alpine-3-18-4']
+        dockerfile: ['elixir-1-11', 'debian-buster', 'alpine-3-17-3', 'alpine-3-18-4', 'alpine-3-20-2']
 
     steps:
       - name: Checkout repository
diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 4a88012..cd90202 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -5,7 +5,7 @@ jobs:
     name: ${{ matrix.tag }}
     strategy:
       matrix:
-        tag: ['elixir-1-11', 'debian-buster', 'alpine-3-17-3', 'alpine-3-18-4']
+        tag: ['elixir-1-11', 'debian-buster', 'alpine-3-17-3', 'alpine-3-18-4', 'alpine-3-20-2']
     env:
       MIX_ENV: test
     runs-on: ubuntu-latest
diff --git a/.tool-versions b/.tool-versions
index adf2a79..b02fb5c 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,3 +1,3 @@
 # locked to the versions we use in the lint CI job
 elixir 1.14.5
-erlang 25.3.1
+erlang 26.1.2