diff --git a/pkgs/development/libraries/haskell/hindent/default.nix b/pkgs/development/libraries/haskell/hindent/default.nix
index 7d003289c7a..36fe2f7113d 100644
--- a/pkgs/development/libraries/haskell/hindent/default.nix
+++ b/pkgs/development/libraries/haskell/hindent/default.nix
@@ -5,8 +5,8 @@
 
 cabal.mkDerivation (self: {
   pname = "hindent";
-  version = "3.9";
-  sha256 = "0x8qm39rmaw1s0fbljr9zp6vnqxfcs1w6a3ylrknwqgwbzzr5hbn";
+  version = "3.9.1";
+  sha256 = "1q1a5smykjs36y29cn34kws443kw0w26xjjfdvv0kf69jpcm4b2f";
   isLibrary = true;
   isExecutable = true;
   buildDepends = [ dataDefault haskellSrcExts monadLoops mtl text ];