diff --git a/default.nix b/default.nix
index 82ea183..038a33e 100644
--- a/default.nix
+++ b/default.nix
@@ -88,6 +88,25 @@ let
       src = lock.get pname;
       buildPhase = ":";
     };
+    org-mode = self.trivialBuild rec {
+      pname = "org-mode";
+      version = "9.4";
+      recipe = null;
+      ename = pname;
+      src = lock.get pname;
+      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.trivialBuild rec {
       pname = "org-yt";
       version = "1";
diff --git a/derivations.json b/derivations.json
index 15ff576..cf4252d 100644
--- a/derivations.json
+++ b/derivations.json
@@ -21,6 +21,10 @@
         "owner": "rgrinberg",
         "repo": "evil-quick-diff"
     },
+    "org-mode": {
+        "owner": "emacs-straight",
+        "repo": "org-mode"
+    },
     "org-yt": {
         "owner": "TobiasZawada",
         "repo": "org-yt"
diff --git a/derivations.lock b/derivations.lock
index beb3b45..f7e6269 100644
--- a/derivations.lock
+++ b/derivations.lock
@@ -115,5 +115,18 @@
             "updated": "2020-01-07T11:56:38+00:00",
             "rev": "4d44e9bbdc3ae35d0050ca298886710f6531f434"
         }
+    },
+    "org-mode": {
+        "fetcher": "fetchFromGitHub",
+        "args": {
+            "owner": "emacs-straight",
+            "repo": "org-mode",
+            "rev": "cd1014a75a1ad63fdc44d6cd2722d529f1f5b7f7",
+            "sha256": "090fpka0mc8qvj2l0s8vh1cm2qfmlx9pfcd2ypnx8p88vgs2chg8"
+        },
+        "meta": {
+            "updated": "2020-01-25T18:50:42+00:00",
+            "rev": "cd1014a75a1ad63fdc44d6cd2722d529f1f5b7f7"
+        }
     }
 }