diff --git a/flake.lock b/flake.lock
index 79e2636..b16b983 100644
--- a/flake.lock
+++ b/flake.lock
@@ -380,11 +380,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1784054915,
-        "narHash": "sha256-vM+E9Yn/wcRV8nBK+GnOx/Hz9wB36tAP67rRaL+1eMI=",
+        "lastModified": 1784148691,
+        "narHash": "sha256-WqyRR30KSk5k9h1bVtAEmkN4gRz0Jj5KG+n0xASb1wc=",
         "ref": "refs/heads/main",
-        "rev": "bf657177d380286fc34b2f8d78afcabf74c38c61",
-        "revCount": 2662,
+        "rev": "419c9659a328b88e47fc070a031735e0cee6f31b",
+        "revCount": 2706,
         "type": "git",
         "url": "https://forge.darkest.space/hyperhive/hyperhive.git"
       },
@@ -1089,11 +1089,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1784053149,
-        "narHash": "sha256-YBQqQ/kVC7nu0p7PM5ArBfWiI3/z9Md/C94O6N5q2Ws=",
+        "lastModified": 1784095038,
+        "narHash": "sha256-zXZtkiA1HLj8cOWlKM52p/dfo6m4T0LydGKwEAF8urY=",
         "owner": "vibec0re",
         "repo": "trollshell",
-        "rev": "5a9c70cb5600aeb503386e88c86ed51e243c6e55",
+        "rev": "1016b150b6451ec64ddedf3fcd3c39396953f05d",
         "type": "github"
       },
       "original": {
diff --git a/homeConfigurations/muede/niri.nix b/homeConfigurations/muede/niri.nix
index 73b97d9..9fe1c66 100644
--- a/homeConfigurations/muede/niri.nix
+++ b/homeConfigurations/muede/niri.nix
@@ -11,10 +11,18 @@
       xwayland-satellite
     ];
 
-    qt.style = {
-      package = pkgs.adwaita-qt;
-      name = "adwaita-dark";
-    };
+    # Qt theming (QT_STYLE_OVERRIDE) is deliberately disabled, here and in
+    # nixosModules/stylix.nix. Qt >= 6.5 resolves QT_STYLE_OVERRIDE as a
+    # Qt Quick Controls style and crashes any QML app when no such QML module
+    # exists: with QT_STYLE_OVERRIDE=adwaita-dark, polkit-kde-agent segfaulted
+    # on every auth request, breaking polkit under niri. adwaita-qt only ships
+    # a Qt5 widget style (archived upstream), so Qt6 apps never got themed
+    # anyway. If a specific Qt5 app needs the style back, set it per app:
+    #   QT_STYLE_OVERRIDE=adwaita-dark <app>
+    # or for a systemd unit: Environment=QT_STYLE_OVERRIDE=adwaita-dark.
+    # A future alternative is stylix's qtct/kvantum platform, once
+    # https://github.com/nix-community/home-manager/issues/6565 is resolved.
+    stylix.targets.qt.enable = false;
 
     services.wpaperd.enable = true;
 
diff --git a/nixosModules/stylix.nix b/nixosModules/stylix.nix
index 4b30dc7..6ceec1b 100644
--- a/nixosModules/stylix.nix
+++ b/nixosModules/stylix.nix
@@ -68,6 +68,9 @@
         gtksourceview.enable = false;
         fontconfig.enable = true;
         plymouth.enable = false;
+        # Sets QT_STYLE_OVERRIDE system-wide, which crashes Qt6 QML apps
+        # (e.g. polkit-kde-agent) — see homeConfigurations/muede/niri.nix.
+        qt.enable = false;
       };
       fonts = {
         sansSerif = {