diff --git a/pkgs/development/libraries/haskell/uu-parsinglib/default.nix b/pkgs/development/libraries/haskell/uu-parsinglib/default.nix
index 6df06579942e..421e23aa5612 100644
--- a/pkgs/development/libraries/haskell/uu-parsinglib/default.nix
+++ b/pkgs/development/libraries/haskell/uu-parsinglib/default.nix
@@ -2,8 +2,8 @@
 
 cabal.mkDerivation (self : {
   pname = "uu-parsinglib";
-  version = "2.3.1";
-  sha256 = "63ed4257f360a861b13f3e0edad6c17bbad90a0e3e031de49ed4d13a1ace98d2";
+  version = "2.3.4";
+  sha256 = "c5faeade06f363c2e7b95a2b7eeba752bf2dd1f4ff0cebbe09aaef9b79f8fdb2";
   meta = {
     description = "New version of the Utrecht University parser combinator library";
   };
diff --git a/pkgs/development/tools/haskell/uuagc/default.nix b/pkgs/development/tools/haskell/uuagc/default.nix
index 248216bf6730..06000e514e7f 100644
--- a/pkgs/development/tools/haskell/uuagc/default.nix
+++ b/pkgs/development/tools/haskell/uuagc/default.nix
@@ -2,9 +2,9 @@
 
 cabal.mkDerivation (self : {
   pname = "uuagc";
-  version = "0.9.14";
+  version = "0.9.29";
   name = self.fname;
-  sha256 = "076250219874b03fc04473a71f6fc6e1c2324f3a65e98a6f7afcaa42de4dea0c";
+  sha256 = "325d395abcc1f8224400a3cd765dd187e6be64a782251aa33080aab008b8829e";
   extraBuildInputs = [uulib];
   meta = {
     description = "Attribute Grammar System of Universiteit Utrecht";