diff --git a/pkgs/applications/networking/browsers/firefox/packages/firefox-beta.nix b/pkgs/applications/networking/browsers/firefox/packages/firefox-beta.nix
index 5b8e791ec555..8dd14fbb7e1f 100644
--- a/pkgs/applications/networking/browsers/firefox/packages/firefox-beta.nix
+++ b/pkgs/applications/networking/browsers/firefox/packages/firefox-beta.nix
@@ -10,11 +10,11 @@
 buildMozillaMach rec {
   pname = "firefox-beta";
   binaryName = pname;
-  version = "141.0b8";
+  version = "141.0b9";
   applicationName = "Firefox Beta";
   src = fetchurl {
     url = "mirror://mozilla/firefox/releases/${version}/source/firefox-${version}.source.tar.xz";
-    sha512 = "6727f7543a6a00e557c282f9a94663bb789eba90ca261725f56277a3eff65bd26b28285618ca5949df1c9254d2f03bbc517b681d6a156b363476542af4c7f913";
+    sha512 = "b474898f3e5955c35fa8bef05ea27d68604aad5ec00e3417bfc586e8a6abd55b19d98515719997b179209a38a032cc96245c67acb2fd7df14d8a355b832c6b77";
   };
 
   meta = {
diff --git a/pkgs/applications/networking/browsers/firefox/packages/firefox-devedition.nix b/pkgs/applications/networking/browsers/firefox/packages/firefox-devedition.nix
index 6f323f4822b9..c7e29fc1677f 100644
--- a/pkgs/applications/networking/browsers/firefox/packages/firefox-devedition.nix
+++ b/pkgs/applications/networking/browsers/firefox/packages/firefox-devedition.nix
@@ -10,13 +10,13 @@
 buildMozillaMach rec {
   pname = "firefox-devedition";
   binaryName = pname;
-  version = "141.0b8";
+  version = "141.0b9";
   applicationName = "Firefox Developer Edition";
   requireSigning = false;
   branding = "browser/branding/aurora";
   src = fetchurl {
     url = "mirror://mozilla/devedition/releases/${version}/source/firefox-${version}.source.tar.xz";
-    sha512 = "b64e483eb1ad1c3bf9b60d59b9fbd99f32eb1689f8b15cde0b08fde4e1fe68481e2f128ff450b1c4922029c328b493d2a2a21434ae7479a744ecb067fc376476";
+    sha512 = "0acb95c53c35d086aa777a96563e5cdc2838b8fedceeba344a2d4f5c9b0cbd148e8d1313463c35cf98fb52048bebd1b7a3aefc63e0d3ac9ae66de69fa25fc2e8";
   };
 
   # buildMozillaMach sets MOZ_APP_REMOTINGNAME during configuration, but