diff --git a/pkgs/development/tools/haskell/uuagc/bootstrap.nix b/pkgs/development/tools/haskell/uuagc/bootstrap.nix
index 8d1c111cc208..2110f2582291 100644
--- a/pkgs/development/tools/haskell/uuagc/bootstrap.nix
+++ b/pkgs/development/tools/haskell/uuagc/bootstrap.nix
@@ -2,8 +2,8 @@
 
 cabal.mkDerivation (self: {
   pname = "uuagc-bootstrap";
-  version = "0.9.39.3.0";
-  sha256 = "0y1ipxkh9rl4mvw9a83dx0slr0ry1yw670z3w3dlb716xyzqyg5z";
+  version = "0.9.39.1.0";
+  sha256 = "06w330j0nds5piv1rr3m6m1idnf0c5swfk9qwdqzi0pmpws6lpkj";
   isLibrary = true;
   isExecutable = true;
   buildDepends = [ haskellSrcExts mtl uulib ];
diff --git a/pkgs/development/tools/haskell/uuagc/default.nix b/pkgs/development/tools/haskell/uuagc/default.nix
index 23949ca006e9..417f430ba9b0 100644
--- a/pkgs/development/tools/haskell/uuagc/default.nix
+++ b/pkgs/development/tools/haskell/uuagc/default.nix
@@ -2,8 +2,8 @@
 
 cabal.mkDerivation (self: {
   pname = "uuagc";
-  version = "0.9.39.3";
-  sha256 = "15wm7r7p9bzhad9nshv0r11h7if581dvlkyagx2whldk40clnk48";
+  version = "0.9.39.1";
+  sha256 = "0zqhwpafq51czy97z0f93cbxd8k6hllnmb24a6yzr4y6kzzv65hd";
   isLibrary = true;
   isExecutable = true;
   buildDepends = [