diff --git a/default.nix b/default.nix
index 4048a21..5b5cb2f 100644
--- a/default.nix
+++ b/default.nix
@@ -24,6 +24,18 @@
      Only used to get emacs package, if `bundledPackages` is set.
   */
 , emacsPackages
+  /* Overlay to customize emacs (elisp) dependencies
+
+     See overrides.nix for addition examples.
+
+     Example:
+       emacsPackagesOverlay = self: super: {
+         magit-delta = super.magit-delta.overrideAttrs (esuper: {
+           buildInputs = esuper.buildInputs ++ [ pkgs.git ];
+         });
+       };
+  */
+, emacsPackagesOverlay ? self: super: {  }
   /* Use bundled revision of github.com/nix-community/emacs-overlay
      as `emacsPackages`.
   */
@@ -59,7 +71,8 @@ let
             then dependencyOverrides.${p}
             else sources.${p};
   # Packages we need to get the default doom configuration run
-  overrides = pkgs.callPackage ./overrides.nix { inherit lock; };
+  overrides = self: super:
+    (pkgs.callPackage ./overrides.nix { inherit lock; } self super) // (emacsPackagesOverlay self super);
 
   # Stage 1: prepare source for byte-compilation
   doomSrc = stdenv.mkDerivation {
diff --git a/nix/sources.json b/nix/sources.json
index 28ce642..1ec82e7 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -5,10 +5,10 @@
         "homepage": "",
         "owner": "hlissner",
         "repo": "doom-emacs",
-        "rev": "ae3a2fa8c27d8e392294904ec6986f860a57f38e",
-        "sha256": "1f3vz9f10qqcxb9lwa51jkvg01v276gb1ssg2gc9jmny2m84d987",
+        "rev": "1456108d5bef89195b2b63f962e0ae9d24f4c652",
+        "sha256": "0j37v0b7jfpaacdf03dq2dm423m24m76m80081vdvykgys5kn45s",
         "type": "tarball",
-        "url": "https://github.com/hlissner/doom-emacs/archive/ae3a2fa8c27d8e392294904ec6986f860a57f38e.tar.gz",
+        "url": "https://github.com/hlissner/doom-emacs/archive/1456108d5bef89195b2b63f962e0ae9d24f4c652.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "doom-snippets": {
@@ -29,10 +29,10 @@
         "homepage": "",
         "owner": "nix-community",
         "repo": "emacs-overlay",
-        "rev": "943ec43e54f5152c4d5d8d0076e72beea9a7ff5a",
-        "sha256": "1amckm9gnh8jr3f34m67im3fwjf5mm262m4sbar24j1f066dsgil",
+        "rev": "585e07a72aa50c06c523fc6037bb13441bd5c47b",
+        "sha256": "1c0rwbzpm3jbb2zii5qv5yqrhcw4zznf6b62xvv8014bz6wfj1hl",
         "type": "tarball",
-        "url": "https://github.com/nix-community/emacs-overlay/archive/943ec43e54f5152c4d5d8d0076e72beea9a7ff5a.tar.gz",
+        "url": "https://github.com/nix-community/emacs-overlay/archive/585e07a72aa50c06c523fc6037bb13441bd5c47b.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "emacs-so-long": {
@@ -137,10 +137,10 @@
         "homepage": "https://code.orgmode.org/bzg/org-mode",
         "owner": "emacs-straight",
         "repo": "org-mode",
-        "rev": "7bc18ebbed409ace4665ec9c9910b2837834b03d",
-        "sha256": "1jn9jfliymvh8s7szzsybkhm4z3g7bw2zvc15k5waskn4zw07pph",
+        "rev": "8a083514a766abb601c50283c05c3f49805e0f66",
+        "sha256": "10vdg413halg1ldi9nsqzaafa7176hh30mz107vpv3kw54mdnj8l",
         "type": "tarball",
-        "url": "https://github.com/emacs-straight/org-mode/archive/7bc18ebbed409ace4665ec9c9910b2837834b03d.tar.gz",
+        "url": "https://github.com/emacs-straight/org-mode/archive/8a083514a766abb601c50283c05c3f49805e0f66.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "org-yt": {
@@ -173,10 +173,10 @@
         "homepage": "https://revealjs.com",
         "owner": "hakimel",
         "repo": "reveal.js",
-        "rev": "15815efe05ca69c35ce66cfdbf93316e1db66ecb",
-        "sha256": "1g3h710rhpyq4vnh6rgyay2dyjpw4rw99p062yhwhgrjkgjyzrc2",
+        "rev": "e09437f4fac47305679374d2b2516a76f6ceb899",
+        "sha256": "0mppzm0cp5v4r7aqim2jbxji836di86an0p9j5wjmnlg5ali3y49",
         "type": "tarball",
-        "url": "https://github.com/hakimel/reveal.js/archive/15815efe05ca69c35ce66cfdbf93316e1db66ecb.tar.gz",
+        "url": "https://github.com/hakimel/reveal.js/archive/e09437f4fac47305679374d2b2516a76f6ceb899.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "rotate-text.el": {