diff --git a/pkgs/development/tools/ocaml/ocaml-top/default.nix b/pkgs/development/tools/ocaml/ocaml-top/default.nix
index e194a77fbe8..e9331d078cf 100644
--- a/pkgs/development/tools/ocaml/ocaml-top/default.nix
+++ b/pkgs/development/tools/ocaml/ocaml-top/default.nix
@@ -1,15 +1,15 @@
 { stdenv, fetchzip, ncurses
 , ocamlPackages
-, opam }:
+, jbuilder }:
 
 stdenv.mkDerivation {
-  name = "ocaml-top-1.1.3";
+  name = "ocaml-top-1.1.4";
   src = fetchzip {
-    url = https://github.com/OCamlPro/ocaml-top/archive/1.1.3.tar.gz;
-    sha256 = "0islyinv7lwhg8hkg4xn30wwz1nv50rj0wpsis8jpimw6jdsnax3";
+    url = https://github.com/OCamlPro/ocaml-top/archive/1.1.4.tar.gz;
+    sha256 = "1lmzjmnzsg8xdz0q5nm95zclihi9z80kzsalapg0s9wq0id8qm4j";
   };
 
-  buildInputs = [ ncurses opam ]
+  buildInputs = [ ncurses jbuilder ]
   ++ (with ocamlPackages; [ ocaml ocpBuild findlib lablgtk ocp-index ]);
 
   configurePhase = ''
@@ -17,9 +17,9 @@ stdenv.mkDerivation {
     ocp-build -init
   '';
 
-  buildPhase = "ocp-build ocaml-top";
+  buildPhase = "jbuilder build";
 
-  installPhase = "opam-installer --prefix=$out";
+  inherit (jbuilder) installPhase;
 
   meta = {
     homepage = http://www.typerex.org/ocaml-top.html;
diff --git a/pkgs/development/tools/ocaml/ocp-build/default.nix b/pkgs/development/tools/ocaml/ocp-build/default.nix
index 931e6989aa1..2a9a634d0a4 100644
--- a/pkgs/development/tools/ocaml/ocp-build/default.nix
+++ b/pkgs/development/tools/ocaml/ocp-build/default.nix
@@ -1,6 +1,6 @@
 { stdenv, fetchFromGitHub, ocaml, findlib, ncurses, buildOcaml }:
 let
-  version = "1.99.18-beta";
+  version = "1.99.19-beta";
 in
 buildOcaml {
 
@@ -11,7 +11,7 @@ buildOcaml {
     owner = "OCamlPro";
     repo = "ocp-build";
     rev = version;
-    sha256 = "14vzam8p1d2c5qxljrhsfppd8a3j9lxx8kzxlplwclkr2laar0ss";
+    sha256 = "162k5l0cxyqanxlml5v8mqapdq5qbqc9m4b8wdjq7mf523b3h2zj";
   };
 
   buildInputs = [ ocaml ];