diff --git a/pkgs/development/tools/ocaml/opam/default.nix b/pkgs/development/tools/ocaml/opam/default.nix
index f844b369eb32..452f162b2356 100644
--- a/pkgs/development/tools/ocaml/opam/default.nix
+++ b/pkgs/development/tools/ocaml/opam/default.nix
@@ -7,7 +7,7 @@ assert lib.versionAtLeast ocaml.version "4.02.3";
 let
   srcs = {
     cmdliner = fetchurl {
-      url = "https://erratique.ch/software/cmdliner/releases/cmdliner-1.0.2.tbz";
+      url = "http://erratique.ch/software/cmdliner/releases/cmdliner-1.0.2.tbz";
       sha256 = "18jqphjiifljlh9jg8zpl6310p3iwyaqphdkmf89acyaix0s4kj1";
     };
     cppo = fetchurl {
@@ -23,16 +23,16 @@ let
       sha256 = "00yvyfm4j423zqndvgc1ycnmiffaa2l9ab40cyg23pf51qmzk2jm";
     };
     dune-local = fetchurl {
-      url = "https://github.com/ocaml/dune/releases/download/1.2.1/dune-1.2.1.tbz";
-      sha256 = "00c5dbm4hkdapc2i7pg07b2lj8sv6ly38qr7zid58cdmbmzq21z9";
+      url = "https://github.com/ocaml/dune/releases/download/1.6.3/dune-1.6.3.tbz";
+      sha256 = "0dmf0wbfmgdy5plz1bjiisc2hjgblvxsnrqjmw2c8y45v1h23mdz";
     };
     extlib = fetchurl {
       url = "http://ygrek.org.ua/p/release/ocaml-extlib/extlib-1.7.5.tar.gz";
       sha256 = "19slqf5bdj0rrph2w41giwmn6df2qm07942jn058pjkjrnk30d4s";
     };
     mccs = fetchurl {
-      url = "https://github.com/AltGr/ocaml-mccs/archive/1.1+9.tar.gz";
-      sha256 = "0gf86c65jdxxcwd96kcmrqxrmnnzc0570gb9ad6c57rl3fyy8yhv";
+      url = "https://github.com/AltGr/ocaml-mccs/archive/1.1+10.tar.gz";
+      sha256 = "003kam22plnh88liyxi4d1065j2rys1mpdla20rxps53ah1xwmxg";
     };
     ocamlgraph = fetchurl {
       url = "http://ocamlgraph.lri.fr/download/ocamlgraph-1.8.8.tar.gz";
@@ -55,13 +55,13 @@ let
       sha256 = "02lb2d9i12bxrz2ba5wygk2bycan316skqlyri0597q7j9210g8r";
     };
     opam = fetchurl {
-      url = "https://github.com/ocaml/opam/archive/2.0.4.zip";
-      sha256 = "1312nc9s4h0vksiimz7jsv3zw17fa05p6mdx23s5sii0qspvnx8c";
+      url = "https://github.com/ocaml/opam/archive/2.0.5.zip";
+      sha256 = "0arv5zaikvcqbicdk47jpfgvjrqhqm71yq2zmj7pp6zf7bm0js6s";
     };
   };
 in stdenv.mkDerivation rec {
   name = "opam-${version}";
-  version = "2.0.4";
+  version = "2.0.5";
 
   buildInputs = [ unzip curl ncurses ocaml makeWrapper getconf ] ++ lib.optional stdenv.isLinux bubblewrap;
 
@@ -117,4 +117,4 @@ in stdenv.mkDerivation rec {
     platforms = platforms.all;
   };
 }
-# Generated by: ./opam.nix.pl -v 2.0.4 -p opam-shebangs.patch
+# Generated by: ./opam.nix.pl -v 2.0.5 -p opam-shebangs.patch