diff --git a/pkgs/applications/networking/remote/dayon/default.nix b/pkgs/applications/networking/remote/dayon/default.nix
index 8af457c7d4c2..843322df55f0 100644
--- a/pkgs/applications/networking/remote/dayon/default.nix
+++ b/pkgs/applications/networking/remote/dayon/default.nix
@@ -10,21 +10,15 @@
 
 stdenv.mkDerivation rec {
   pname = "dayon";
-  version = "12.0.1";
+  version = "13.0.0";
 
   src = fetchFromGitHub {
     owner = "RetGal";
     repo = "dayon";
     rev = "v${version}";
-    hash = "sha256-SCInonMTvBXtiDxWlN8QWNS+8MFB52vloonqfLcAEis=";
+    hash = "sha256-2Fo+LQvsrDvqEudZxzQBtJHGxrRYUyNyhrPV1xS49pQ=";
   };
 
-  # https://github.com/RetGal/Dayon/pull/66
-  postPatch = ''
-    substituteInPlace resources/deb/dayon_assisted.desktop resources/deb/dayon_assistant.desktop \
-      --replace "Exec=/usr/bin/" "Exec="
-  '';
-
   nativeBuildInputs = [
     ant
     jdk
@@ -47,11 +41,15 @@ stdenv.mkDerivation rec {
     runHook preInstall
     install -Dm644 build/dayon.jar $out/share/dayon/dayon.jar
     mkdir -p $out/bin
+    # jre is in PATH because dayon needs keytool to generate certificates
     makeWrapper ${jre}/bin/java $out/bin/dayon \
+      --prefix PATH : "${lib.makeBinPath [ jre ]}" \
       --add-flags "-jar $out/share/dayon/dayon.jar"
     makeWrapper ${jre}/bin/java $out/bin/dayon_assisted \
+      --prefix PATH : "${lib.makeBinPath [ jre ]}" \
       --add-flags "-cp $out/share/dayon/dayon.jar mpo.dayon.assisted.AssistedRunner"
     makeWrapper ${jre}/bin/java $out/bin/dayon_assistant \
+      --prefix PATH : "${lib.makeBinPath [ jre ]}" \
       --add-flags "-cp $out/share/dayon/dayon.jar mpo.dayon.assistant.AssistantRunner"
     install -Dm644 resources/dayon.png $out/share/icons/hicolor/128x128/apps/dayon.png
     runHook postInstall