diff --git a/pkgs/applications/audio/mbrola/default.nix b/pkgs/applications/audio/mbrola/default.nix
index ade11f764c70d4..e025827fed7adc 100644
--- a/pkgs/applications/audio/mbrola/default.nix
+++ b/pkgs/applications/audio/mbrola/default.nix
@@ -8,7 +8,7 @@
 
 let
   pname = "mbrola";
-  version = "3.3";
+  version = "3.3-unstable-2024-01-29";
 
   meta = with lib; {
     license = licenses.agpl3Plus;
@@ -25,8 +25,8 @@ let
     src = fetchFromGitHub {
       owner = "numediart";
       repo = "MBROLA";
-      rev = version;
-      sha256 = "1w86gv6zs2cbr0731n49z8v6xxw0g8b0hzyv2iqb9mqcfh38l8zy";
+      rev = "bf17e9e1416a647979ac683657a536e8ca5d880e";
+      hash = "sha256-ZjCl1gx/6sGtpXAYO4sAh6dutjwzClQ7kZoq0WaaBlU=";
     };
 
     # required for cross compilation