diff --git a/pkgs/development/tools/parsing/re-flex/default.nix b/pkgs/development/tools/parsing/re-flex/default.nix
index 0dd520eb9e3f..3ef4e6db4751 100644
--- a/pkgs/development/tools/parsing/re-flex/default.nix
+++ b/pkgs/development/tools/parsing/re-flex/default.nix
@@ -9,13 +9,13 @@
 
 stdenv.mkDerivation rec {
   pname = "re-flex";
-  version = "3.3.8";
+  version = "3.4.1";
 
   src = fetchFromGitHub {
     owner = "Genivia";
     repo = "RE-flex";
     rev = "v${version}";
-    sha256 = "sha256-ujBdR4NDY9TwHwghtj2uMJoLtuYpzw5cUCMSbEsXlmY=";
+    sha256 = "sha256-U25W/hNPol6WtBDrKsft00vr/GoRjaNEr36fq2L9FlY=";
   };
 
   nativeBuildInputs = [ boost autoconf automake ];