diff --git a/pkgs/servers/sks/default.nix b/pkgs/servers/sks/default.nix
index 8e0ce6bedac5..7a9836e1142f 100644
--- a/pkgs/servers/sks/default.nix
+++ b/pkgs/servers/sks/default.nix
@@ -1,22 +1,36 @@
-{ lib, stdenv, fetchFromBitbucket, ocaml, zlib, db, perl, camlp4 }:
+{ lib, stdenv, fetchFromGitHub, ocamlPackages, perl
+, zlib, db
+}:
+
+let
+  inherit (ocamlPackages)
+    ocaml
+    findlib
+    cryptokit
+    num
+    ;
+in
 
 stdenv.mkDerivation rec {
   pname = "sks";
-  version = "1.1.6";
+  version = "unstable-2021-02-04";
 
-  src = fetchFromBitbucket {
-    owner = "skskeyserver";
+  src = fetchFromGitHub {
+    owner = "SKS-Keyserver";
     repo = "sks-keyserver";
-    rev = version;
-    sha256 = "00q5ma5rvl10rkc6cdw8d69bddgrmvy0ckqj3hbisy65l4idj2zm";
+    rev = "c3ba6d5abb525dcb84745245631c410c11c07ec1";
+    sha256 = "0fql07sc69hv6jy7x5svb19977cdsz0p1j8wv53k045a6v7rw1jw";
   };
 
   # pkgs.db provides db_stat, not db$major.$minor_stat
-  patches = [ ./adapt-to-nixos.patch ];
+  patches = [
+    ./adapt-to-nixos.patch
+  ];
 
   outputs = [ "out" "webSamples" ];
 
-  buildInputs = [ ocaml zlib db perl camlp4 ];
+  nativeBuildInputs = [ ocaml findlib perl ];
+  buildInputs = [ zlib db cryptokit num ];
 
   makeFlags = [ "PREFIX=$(out)" "MANDIR=$(out)/share/man" ];
   preConfigure = ''
@@ -44,7 +58,7 @@ stdenv.mkDerivation rec {
       spotty connectivity, can fully synchronize with rest of the system.
     '';
     inherit (src.meta) homepage;
-    license = licenses.gpl2;
+    license = licenses.gpl2Plus;
     platforms = platforms.linux;
     maintainers = with maintainers; [ primeos fpletz globin ];
   };
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 3ff14e23fbe9..64bf6b05ceea 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -8087,7 +8087,7 @@ in
 
   skippy-xd = callPackage ../tools/X11/skippy-xd {};
 
-  sks = callPackage ../servers/sks { inherit (ocaml-ng.ocamlPackages_4_02) ocaml camlp4; };
+  sks = callPackage ../servers/sks { };
 
   skydns = callPackage ../servers/skydns { };