diff --git a/default.nix b/default.nix
index e329dbb..eb1c857 100644
--- a/default.nix
+++ b/default.nix
@@ -58,78 +58,7 @@ let
             then dependencyOverrides.${p}
             else sources.${p};
   # Packages we need to get the default doom configuration run
-  overrides = self: super: {
-    evil-escape = super.evil-escape.overrideAttrs (esuper: {
-      patches = [ ./evil-escape.patch ];
-    });
-    straightBuild = { pname, ... }@args: self.trivialBuild ({
-      ename = pname;
-      version = "1";
-      src = lock pname;
-      buildPhase = ":";
-    } // args);
-    doom-snippets = self.straightBuild {
-      pname = "doom-snippets";
-    };
-    evil-markdown = self.straightBuild {
-      pname = "evil-markdown";
-    };
-    evil-org = self.straightBuild {
-      pname = "evil-org-mode";
-    };
-    evil-quick-diff = self.straightBuild {
-      pname = "evil-quick-diff";
-    };
-    magit = super.magit.overrideAttrs (esuper: {
-      preBuild = ''
-        make VERSION="${esuper.version}" -C lisp magit-version.el
-      '';
-    });
-    org-mode = self.straightBuild rec {
-      pname = "org-mode";
-      version = "9.4";
-      installPhase = ''
-        LISPDIR=$out/share/emacs/site-lisp
-        install -d $LISPDIR
-
-        cp -r * $LISPDIR
-
-        cat > $LISPDIR/lisp/org-version.el <<EOF
-        (fset 'org-release (lambda () "${version}"))
-        (fset 'org-git-version #'ignore)
-        (provide 'org-version)
-        EOF
-      '';
-    };
-    org-yt = self.straightBuild {
-      pname = "org-yt";
-    };
-    php-extras = self.straightBuild {
-      pname = "php-extras";
-    };
-    rotate-text = self.straightBuild {
-      pname = "rotate-text.el";
-    };
-    so-long = self.straightBuild {
-      pname = "emacs-so-long";
-    };
-    ob-racket = self.straightBuild {
-      pname = "ob-racket";
-    };
-
-    # dune has a nontrivial derivation, which does not buildable from the melpa
-    # wrapper falling back to the one in nixpkgs
-    dune = pkgs.dune.overrideAttrs (old: {
-      # Emacs derivations require an ename attribute
-      ename = old.pname;
-
-      # Need to adjust paths here match what doom expects
-      postInstall = ''
-        mkdir -p $out/share/emacs/site-lisp/editor-integration
-        ln -snf $out/share/emacs/site-lisp $out/share/emacs/site-lisp/editor-integration/emacs
-      '';
-    });
-  };
+  overrides = pkgs.callPackage ./overrides.nix { inherit lock; };
 
   # Stage 1: prepare source for byte-compilation
   doomSrc = stdenv.mkDerivation {
diff --git a/nix/sources.json b/nix/sources.json
index e3c997c..46e62b1 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -5,10 +5,10 @@
         "homepage": "",
         "owner": "hlissner",
         "repo": "doom-emacs",
-        "rev": "75b6e11f5656e86f05097cfca8de4d8cae9da1f5",
-        "sha256": "13dxqnjzhmb7y60aq5da5ihl8dnzg33mnqnx58f8lpa7vd9ixjvf",
+        "rev": "dd8b535eb132f430c206bcf3eff40577f07f01f8",
+        "sha256": "0jipxxd6jjk1wqk8864xanhwdawpvjg66wab4xddfxfpd3nyv5q5",
         "type": "tarball",
-        "url": "https://github.com/hlissner/doom-emacs/archive/75b6e11f5656e86f05097cfca8de4d8cae9da1f5.tar.gz",
+        "url": "https://github.com/hlissner/doom-emacs/archive/dd8b535eb132f430c206bcf3eff40577f07f01f8.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": "18b06b2a74bd74ef19c06baf1f149b5b6838aea5",
-        "sha256": "1vhx9yqi7ys5bv9y7xf5fhfxlzpqfvxxnvpca5w1i0yx3j4pgc5g",
+        "rev": "fe8bfdcf1f15ea80340c1b2174ca1f944fe53fb0",
+        "sha256": "1hilhwl164xk6p84haflj07wpxb26x66prwamqhkaq63ybw9r8ja",
         "type": "tarball",
-        "url": "https://github.com/nix-community/emacs-overlay/archive/18b06b2a74bd74ef19c06baf1f149b5b6838aea5.tar.gz",
+        "url": "https://github.com/nix-community/emacs-overlay/archive/fe8bfdcf1f15ea80340c1b2174ca1f944fe53fb0.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "emacs-so-long": {
@@ -53,10 +53,10 @@
         "homepage": null,
         "owner": "Somelauw",
         "repo": "evil-markdown",
-        "rev": "685d7fbb81bc02fa32779d2a127b99a0c8c7436b",
-        "sha256": "1z1sjn6dcqv8mmkh6nfcwhnql2z6xr9yx3hs77bfxj79pf3c466p",
+        "rev": "064fe9b4767470472356d20bdd08e2f30ebbc9ac",
+        "sha256": "15mchbzwnlyccplqk0ly298z5kxc5qyvcmpmd8q5l22pdp2b1p9a",
         "type": "tarball",
-        "url": "https://github.com/Somelauw/evil-markdown/archive/685d7fbb81bc02fa32779d2a127b99a0c8c7436b.tar.gz",
+        "url": "https://github.com/Somelauw/evil-markdown/archive/064fe9b4767470472356d20bdd08e2f30ebbc9ac.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "evil-org-mode": {
@@ -113,10 +113,10 @@
         "homepage": "https://code.orgmode.org/bzg/org-mode",
         "owner": "emacs-straight",
         "repo": "org-mode",
-        "rev": "d73fd145c00e8c65da54a9b59224fbf22f9c6822",
-        "sha256": "0c5bzyih3jdnxn7cwn8sglcyrf4i2azbrj9b3w3q16s122yapf2c",
+        "rev": "99acb17d06e0c7549841ea6cb7c6ce4df927c6c6",
+        "sha256": "0kpdly6kzj3fz993hmamqkcj4b40a9r2a7x2m200mhv7ims8w9q8",
         "type": "tarball",
-        "url": "https://github.com/emacs-straight/org-mode/archive/d73fd145c00e8c65da54a9b59224fbf22f9c6822.tar.gz",
+        "url": "https://github.com/emacs-straight/org-mode/archive/99acb17d06e0c7549841ea6cb7c6ce4df927c6c6.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "org-yt": {
diff --git a/overrides.nix b/overrides.nix
new file mode 100644
index 0000000..749f9f1
--- /dev/null
+++ b/overrides.nix
@@ -0,0 +1,86 @@
+{ lock, dune }:
+
+self: super: {
+  straightBuild = { pname, ... }@args: self.trivialBuild ({
+    ename = pname;
+    version = "1";
+    src = lock pname;
+    buildPhase = ":";
+  } // args);
+
+  evil-escape = super.evil-escape.overrideAttrs (esuper: {
+    patches = [ ./evil-escape.patch ];
+  });
+
+  doom-snippets = self.straightBuild {
+    pname = "doom-snippets";
+  };
+
+  evil-markdown = self.straightBuild {
+    pname = "evil-markdown";
+  };
+
+  evil-org = self.straightBuild {
+    pname = "evil-org-mode";
+  };
+
+  evil-quick-diff = self.straightBuild {
+    pname = "evil-quick-diff";
+  };
+
+  magit = super.magit.overrideAttrs (esuper: {
+    preBuild = ''
+      make VERSION="${esuper.version}" -C lisp magit-version.el
+    '';
+  });
+
+  org-mode = self.straightBuild rec {
+    pname = "org-mode";
+    version = "9.4";
+    installPhase = ''
+      LISPDIR=$out/share/emacs/site-lisp
+      install -d $LISPDIR
+
+      cp -r * $LISPDIR
+
+      cat > $LISPDIR/lisp/org-version.el <<EOF
+      (fset 'org-release (lambda () "${version}"))
+      (fset 'org-git-version #'ignore)
+      (provide 'org-version)
+      EOF
+    '';
+  };
+
+  org-yt = self.straightBuild {
+    pname = "org-yt";
+  };
+
+  php-extras = self.straightBuild {
+    pname = "php-extras";
+  };
+
+  rotate-text = self.straightBuild {
+    pname = "rotate-text.el";
+  };
+
+  so-long = self.straightBuild {
+    pname = "emacs-so-long";
+  };
+
+  ob-racket = self.straightBuild {
+    pname = "ob-racket";
+  };
+
+  # dune has a nontrivial derivation, which does not buildable from the melpa
+  # wrapper falling back to the one in nixpkgs
+  dune = dune.overrideAttrs (old: {
+    # Emacs derivations require an ename attribute
+    ename = old.pname;
+
+    # Need to adjust paths here match what doom expects
+    postInstall = ''
+      mkdir -p $out/share/emacs/site-lisp/editor-integration
+      ln -snf $out/share/emacs/site-lisp $out/share/emacs/site-lisp/editor-integration/emacs
+    '';
+  });
+}