diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..ca79ca5
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
diff --git a/.github/workflows/byte-compile.yml b/.github/workflows/byte-compile.yml
new file mode 100644
index 0000000..58512c4
--- /dev/null
+++ b/.github/workflows/byte-compile.yml
@@ -0,0 +1,33 @@
+name: Byte-compile
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  byte-compile:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        emacs_version:
+          - '24.4'
+          - '30.1'
+          - snapshot
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+
+      - name: Set up Emacs
+        uses: purcell/setup-emacs@master
+        with:
+          version: ${{ matrix.emacs_version }}
+
+      - name: Byte-compile with warnings as errors
+        run: |
+          emacs --batch -L . \
+            --eval '(setq byte-compile-error-on-warn t)' \
+            -f batch-byte-compile \
+            caml.el inf-caml.el caml-help.el caml-types.el \
+            caml-font.el caml-font-old.el camldebug.el
diff --git a/caml-font-old.el b/caml-font-old.el
index a2a0910..f22535c 100644
--- a/caml-font-old.el
+++ b/caml-font-old.el
@@ -19,7 +19,8 @@
 
 (defface caml-font-stop-face
   '((t :foreground "White" :background "Red"))
-  "Extra faces for documentation.")
+  "Extra faces for documentation."
+  :group 'languages)
 (define-obsolete-face-alias 'Stop 'caml-font-stop-face "2023")
 (unless (boundp 'font-lock-stop-face)
   (defvar font-lock-stop-face 'caml-font-stop-face)
diff --git a/caml-font.el b/caml-font.el
index f541d73..5df3204 100644
--- a/caml-font.el
+++ b/caml-font.el
@@ -19,13 +19,15 @@
 
 (defface caml-font-stop-face
   '((t :foreground "White" :background "Red"))
-  "Extra faces for documentation.")
+  "Extra faces for documentation."
+  :group 'languages)
 (defvar caml-font-stop-face 'caml-font-stop-face)
 (make-obsolete-variable 'caml-font-stop-face "use the face instead" "2023")
 
 (defface caml-font-doccomment-face
   '((t :foreground "Red")) ;; FIXME: Inherit from `font-lock-doc-face'?
-  "Face for ocamldoc comments.")
+  "Face for ocamldoc comments."
+  :group 'languages)
 (defvar caml-font-doccomment-face 'caml-font-doccomment-face)
 (make-obsolete-variable 'caml-font-doccomment-face "use the face instead" "2023")
 
diff --git a/camldebug.el b/camldebug.el
index c0ac4c5..9601412 100644
--- a/camldebug.el
+++ b/camldebug.el
@@ -84,13 +84,15 @@
 
 (defface camldebug-event
   '((t :inverse-video t))
-  "Face to highlight the first/last char of current event.")
+  "Face to highlight the first/last char of current event."
+  :group 'languages)
 
 (defface camldebug-underline
   ;; FIXME: The name should describe what it's used for, not what it looks
   ;; like by default!
   '((t :underline t))
-  "Face to highlight the rest of current event.")
+  "Face to highlight the rest of current event."
+  :group 'languages)
 
 ;;; Camldebug mode.