diff --git a/.github/scripts/update-readable-css.sh b/.github/scripts/update-readable-css.sh
new file mode 100755
index 0000000..90f0cae
--- /dev/null
+++ b/.github/scripts/update-readable-css.sh
@@ -0,0 +1,43 @@
+#!/bin/bash
+set -o errexit
+set -o pipefail
+set -o nounset
+
+# Query the codeberg.org API (see
+# https://codeberg.org/api/swagger#/repository/repoListReleases) and use jq to
+# get the tag name of the latest release (i.e. the first element of the array
+# in the JSON output). Finally, use sed to remove the double quotes around the
+# value.
+TAG_VERSION=$(curl -s \
+    -H 'accept: application/json' \
+    https://codeberg.org/api/v1/repos/Freedom-to-Write/readable.css/releases \
+    | jq '.[0].tag_name' \
+    | sed 's/"//g')
+
+echo "Latest tag: ${TAG_VERSION}"
+
+# Get the current version.
+# The '-o' option will only output the match grep found.
+# We look for readable.min.css and a set of three numbers seperated by dots,
+# i.e. a semantic version. readable.min.css is used to make sure that we match
+# the right numbers in the file.
+# We use sed to get rid of the readable.min.css prefix.
+CURRENT_VERSION=$(grep -o \
+    'readable.min.css?v=[[:digit:]]\+\.[[:digit:]]\+\.[[:digit:]]\+' \
+    layouts/partials/head.html \
+    | sed 's/readable.min.css?v=/v/')
+echo "Current version: ${CURRENT_VERSION}"
+
+if [[ $TAG_VERSION == $CURRENT_VERSION ]]
+then
+    echo "Nothing to do. The current version is already up to date."
+else
+    curl -s "https://codeberg.org/Freedom-to-Write/readable.css/raw/tag/${TAG_VERSION}/readable.css" > static/css/readable.css
+    curl -s "https://codeberg.org/Freedom-to-Write/readable.css/raw/tag/${TAG_VERSION}/readable.min.css" > static/css/readable.min.css
+    VERSION=$(echo "${TAG_VERSION}" | sed 's/v//')
+    sed -i "s/readable.min.css?v=.*/readable.min.css?v=${VERSION}\">/" layouts/partials/head.html
+fi
+
+# Add the latest tag version to the workflow environment, so we can access
+# it in later steps.
+echo "READABLE_CSS_TAG=${TAG_VERSION}" >> "$GITHUB_ENV"
diff --git a/.github/workflows/update-readable-css.yml b/.github/workflows/update-readable-css.yml
new file mode 100644
index 0000000..cab3bf0
--- /dev/null
+++ b/.github/workflows/update-readable-css.yml
@@ -0,0 +1,42 @@
+name: update-readable-css
+
+on:
+  schedule:
+    # Every day at 3:28.
+    - cron: '28 3 * * *'
+
+jobs:
+  update-readable-css:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Download CSS files for latest tag
+        run: .github/scripts/update-readable-css.sh
+      - name: Create pull request if files have changed
+        # https://github.com/marketplace/actions/create-pull-request
+        uses: peter-evans/create-pull-request@v5
+        with:
+          # First line is the commit subject as always. The rest goes
+          # into the body.
+          commit-message: |
+            Update readable.css to ${{ env.READABLE_CSS_TAG }}
+
+            See the changelog here:
+
+            https://codeberg.org/Freedom-to-Write/readable.css/src/tag/${{ env.READABLE_CSS_TAG }}/CHANGELOG.md
+          branch: update-readable-css
+          delete-branch: true
+          # Use 'GitHub' both times.
+          # This is already the default for committer, but the author defaults
+          # to the user who triggered the workflow run, which is the owner of
+          # the repository.
+          # We use the same value for the author to indicate that the
+          # commit was created by a bot.
+          committer: GitHub <noreply@github.com>
+          author: GitHub <noreply@github.com>
+          title: Update readable.css to ${{ env.READABLE_CSS_TAG }}
+          body: |
+            See the changelog here:
+
+            https://codeberg.org/Freedom-to-Write/readable.css/src/tag/${{ env.READABLE_CSS_TAG }}/CHANGELOG.md
+          labels: update-readable-css