diff --git a/pkgs/applications/networking/browsers/palemoon/bin.nix b/pkgs/applications/networking/browsers/palemoon/bin.nix
index b05c73387394..d6baf363af04 100644
--- a/pkgs/applications/networking/browsers/palemoon/bin.nix
+++ b/pkgs/applications/networking/browsers/palemoon/bin.nix
@@ -6,7 +6,9 @@
   autoPatchelfHook,
   copyDesktopItems,
   dbus-glib,
-  ffmpeg,
+  # ffmpeg 7 not supported yet, results in MP4 playback being unavailable
+  # https://repo.palemoon.org/MoonchildProductions/UXP/issues/2523
+  ffmpeg_6,
   gtk2-x11,
   withGTK3 ? true,
   gtk3,
@@ -21,7 +23,7 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "palemoon-bin";
-  version = "33.6.1";
+  version = "33.7.0";
 
   src = finalAttrs.passthru.sources."gtk${if withGTK3 then "3" else "2"}";
 
@@ -145,7 +147,7 @@ stdenv.mkDerivation (finalAttrs: {
     gappsWrapperArgs+=(
       --prefix LD_LIBRARY_PATH : "${
         lib.makeLibraryPath [
-          ffmpeg
+          ffmpeg_6
           libglvnd
           libpulseaudio
         ]
@@ -172,11 +174,11 @@ stdenv.mkDerivation (finalAttrs: {
       {
         gtk3 = fetchzip {
           urls = urlRegionVariants "gtk3";
-          hash = "sha256-OaiY34UcPZ0zxDZP/VrJyEXou2Kz77SqMuJMiVCRIbA=";
+          hash = "sha256-pWqBcYBSRFI67Q4A38qf7KibZQ1vRlDnTEhJJbTw1Yg=";
         };
         gtk2 = fetchzip {
           urls = urlRegionVariants "gtk2";
-          hash = "sha256-Yq9bpvyNP+tOKvcZbjxbNhrtimi6Ylb5vBytx+OEgiI=";
+          hash = "sha256-hZhhWIuRu1329VNArT7bsaDqcw/NCopZ5/x5rXVE6y4=";
         };
       };