diff --git a/pkgs/development/libraries/ctranslate2/default.nix b/pkgs/development/libraries/ctranslate2/default.nix
index dbd213f8a3f0..369630c81243 100644
--- a/pkgs/development/libraries/ctranslate2/default.nix
+++ b/pkgs/development/libraries/ctranslate2/default.nix
@@ -24,13 +24,13 @@ let
 in
 stdenv.mkDerivation rec {
   pname = "ctranslate2";
-  version = "4.2.0";
+  version = "4.2.1";
 
   src = fetchFromGitHub {
     owner = "OpenNMT";
     repo = "CTranslate2";
     rev = "v${version}";
-    hash = "sha256-P/aXrzaCF6Rz99Pz9CkpR/FlWXCj04q/4swiAddcwKk=";
+    hash = "sha256-Bg25HL7BDM+SHtM0m7mJ3mAdpFe4kefdiDx5Ek1pQBs=";
     fetchSubmodules = true;
   };
 
diff --git a/pkgs/development/python-modules/faster-whisper/default.nix b/pkgs/development/python-modules/faster-whisper/default.nix
index 847afc47a352..2fe0b785cea6 100644
--- a/pkgs/development/python-modules/faster-whisper/default.nix
+++ b/pkgs/development/python-modules/faster-whisper/default.nix
@@ -1,6 +1,7 @@
 { lib
 , buildPythonPackage
 , fetchFromGitHub
+, pythonRelaxDepsHook
 
 # build-system
 , setuptools
@@ -30,6 +31,11 @@ buildPythonPackage rec {
 
   build-system = [
     setuptools
+    pythonRelaxDepsHook
+  ];
+
+  pythonRelaxDeps = [
+    "tokenizers"
   ];
 
   dependencies = [