diff --git a/preserves-nim/default.nix b/preserves-nim/default.nix
index 30435d8..f0625aa 100644
--- a/preserves-nim/default.nix
+++ b/preserves-nim/default.nix
@@ -1,12 +1,11 @@
-{ lib, stdenv, buildNimPackage, fetchFromGitea, fetchFromGitHub, preserves }:
+{ lib, stdenv, buildNimPackage, fetchFromGitea, fetchFromGitHub, runCommand
+, nim-unwrapped, preserves }:
 
 let
-  compiler = fetchFromGitHub {
-    owner = "nim-lang";
-    repo = "nim";
-    rev = "v1.6.0";
-    hash = "sha256-C9oveXIufv0HqMQw6eNmLbku4Sd7r28PKcRILvKYzn0=";
-  };
+  compiler = runCommand "compiler.nimble" { inherit (nim-unwrapped) src; } ''
+    mkdir -p $out
+    tar xf $src --strip-components=1 -C $out
+  '';
 
   npeg = fetchFromGitHub {
     owner = "zevv";
@@ -17,13 +16,13 @@ let
 
 in buildNimPackage rec {
   pname = "preserves";
-  version = "3.3.1";
+  version = "20220625";
   src = fetchFromGitea {
     domain = "git.syndicate-lang.org";
     owner = "ehmry";
     repo = "${pname}-nim";
-    rev = "nim-${pname}-${version}";
-    sha256 = "sha256-xliHep/00EYWK9Y7bxhW6I/at3pbSJX7BCtngVo9UtY=";
+    rev = version;
+    sha256 = "sha256-ZNgBlIOKyWD0R5wZvGb/0K5tUpz5q5QpET4Qa/kxhkA=";
   };
 
   propagatedBuildInputs = [ compiler npeg ];
diff --git a/xdg_open_ng/default.nix b/xdg_open_ng/default.nix
index 7d97f0e..0a0d371 100644
--- a/xdg_open_ng/default.nix
+++ b/xdg_open_ng/default.nix
@@ -2,15 +2,15 @@
 
 buildNimPackage rec {
   pname = "xdg_open_ng";
-  version = "0.4.0";
+  version = "20220625";
   nimBinOnly = true;
 
   src = fetchFromGitea {
     domain = "git.syndicate-lang.org";
     owner = "ehmry";
     repo = pname;
-    rev = "${pname}-${version}";
-    hash = "sha256-8Ox6ypxbn3X+Yj0VIaHF5JLvoTknPoYf/xYIMwyyfWg=";
+    rev = version;
+    hash = "sha256-yOuR4KYAMxlRc4AIr3ud0HzidHDQPeIiN3dzlnphLug=";
   };
 
   propagatedBuildInputs = [ syndicate ];
@@ -20,7 +20,6 @@ buildNimPackage rec {
     desktopName = "Syndicate URI dispatcher (xdg-open)";
     exec = "${name} %U";
     mimeTypes = [
-      "all/all"
       "application/xhtml+xml"
       "text/html"
       "text/xml"