diff --git a/pkgs/development/haskell-modules/cabal2nix-unstable/cabal2nix.nix b/pkgs/development/haskell-modules/cabal2nix-unstable/cabal2nix.nix
index afa2ab7a079a..1368246c3fa8 100644
--- a/pkgs/development/haskell-modules/cabal2nix-unstable/cabal2nix.nix
+++ b/pkgs/development/haskell-modules/cabal2nix-unstable/cabal2nix.nix
@@ -35,10 +35,10 @@
 }:
 mkDerivation {
   pname = "cabal2nix";
-  version = "2.21.0-unstable-2026-01-25";
+  version = "2.21.2-unstable-2026-03-07";
   src = fetchzip {
-    url = "https://github.com/NixOS/cabal2nix/archive/751a8eccfc92f8ce3ca9d517c554e7dcb3f409bd.tar.gz";
-    sha256 = "1i9ifxmh5bqgpa7a6l46lqkzpr7z3zfm7bdkllq56hz1nmj4gbqx";
+    url = "https://github.com/NixOS/cabal2nix/archive/977a1c199f7f8092ce9eef7d322b0eecebde22a2.tar.gz";
+    sha256 = "0nl5502mpwhmav7qxx051zzyx8ag9mibwhh33bf4aj07ywziza4c";
   };
   postUnpack = "sourceRoot+=/cabal2nix; echo source root reset to $sourceRoot";
   isLibrary = true;
diff --git a/pkgs/development/haskell-modules/cabal2nix-unstable/distribution-nixpkgs.nix b/pkgs/development/haskell-modules/cabal2nix-unstable/distribution-nixpkgs.nix
index 8a5382ee2ac3..495a3849544b 100644
--- a/pkgs/development/haskell-modules/cabal2nix-unstable/distribution-nixpkgs.nix
+++ b/pkgs/development/haskell-modules/cabal2nix-unstable/distribution-nixpkgs.nix
@@ -18,10 +18,10 @@
 }:
 mkDerivation {
   pname = "distribution-nixpkgs";
-  version = "1.7.1.1-unstable-2026-01-25";
+  version = "1.7.1.1-unstable-2026-03-07";
   src = fetchzip {
-    url = "https://github.com/NixOS/cabal2nix/archive/751a8eccfc92f8ce3ca9d517c554e7dcb3f409bd.tar.gz";
-    sha256 = "1i9ifxmh5bqgpa7a6l46lqkzpr7z3zfm7bdkllq56hz1nmj4gbqx";
+    url = "https://github.com/NixOS/cabal2nix/archive/977a1c199f7f8092ce9eef7d322b0eecebde22a2.tar.gz";
+    sha256 = "0nl5502mpwhmav7qxx051zzyx8ag9mibwhh33bf4aj07ywziza4c";
   };
   postUnpack = "sourceRoot+=/distribution-nixpkgs; echo source root reset to $sourceRoot";
   enableSeparateDataOutput = true;
diff --git a/pkgs/development/haskell-modules/cabal2nix-unstable/hackage-db.nix b/pkgs/development/haskell-modules/cabal2nix-unstable/hackage-db.nix
index c0363bea2617..eeb10e513e7a 100644
--- a/pkgs/development/haskell-modules/cabal2nix-unstable/hackage-db.nix
+++ b/pkgs/development/haskell-modules/cabal2nix-unstable/hackage-db.nix
@@ -13,14 +13,13 @@
   lib,
   tar,
   time,
-  utf8-string,
 }:
 mkDerivation {
   pname = "hackage-db";
-  version = "2.1.3-unstable-2026-01-25";
+  version = "2.1.3-unstable-2026-03-07";
   src = fetchzip {
-    url = "https://github.com/NixOS/cabal2nix/archive/751a8eccfc92f8ce3ca9d517c554e7dcb3f409bd.tar.gz";
-    sha256 = "1i9ifxmh5bqgpa7a6l46lqkzpr7z3zfm7bdkllq56hz1nmj4gbqx";
+    url = "https://github.com/NixOS/cabal2nix/archive/977a1c199f7f8092ce9eef7d322b0eecebde22a2.tar.gz";
+    sha256 = "0nl5502mpwhmav7qxx051zzyx8ag9mibwhh33bf4aj07ywziza4c";
   };
   postUnpack = "sourceRoot+=/hackage-db; echo source root reset to $sourceRoot";
   isLibrary = true;
@@ -36,7 +35,6 @@ mkDerivation {
     filepath
     tar
     time
-    utf8-string
   ];
   homepage = "https://github.com/NixOS/cabal2nix/tree/master/hackage-db#readme";
   description = "Access cabal-install's Hackage database via Data.Map";
diff --git a/pkgs/development/haskell-modules/cabal2nix-unstable/language-nix.nix b/pkgs/development/haskell-modules/cabal2nix-unstable/language-nix.nix
index 53130dcbc60d..13509f8cd37c 100644
--- a/pkgs/development/haskell-modules/cabal2nix-unstable/language-nix.nix
+++ b/pkgs/development/haskell-modules/cabal2nix-unstable/language-nix.nix
@@ -14,10 +14,10 @@
 }:
 mkDerivation {
   pname = "language-nix";
-  version = "2.3.0-unstable-2026-01-25";
+  version = "2.3.0-unstable-2026-03-07";
   src = fetchzip {
-    url = "https://github.com/NixOS/cabal2nix/archive/751a8eccfc92f8ce3ca9d517c554e7dcb3f409bd.tar.gz";
-    sha256 = "1i9ifxmh5bqgpa7a6l46lqkzpr7z3zfm7bdkllq56hz1nmj4gbqx";
+    url = "https://github.com/NixOS/cabal2nix/archive/977a1c199f7f8092ce9eef7d322b0eecebde22a2.tar.gz";
+    sha256 = "0nl5502mpwhmav7qxx051zzyx8ag9mibwhh33bf4aj07ywziza4c";
   };
   postUnpack = "sourceRoot+=/language-nix; echo source root reset to $sourceRoot";
   libraryHaskellDepends = [