diff --git a/pkgs/development/libraries/haskell/tls/1.2.3.nix b/pkgs/development/libraries/haskell/tls/1.2.6.nix
similarity index 92%
rename from pkgs/development/libraries/haskell/tls/1.2.3.nix
rename to pkgs/development/libraries/haskell/tls/1.2.6.nix
index 5906413796db..15019265f911 100644
--- a/pkgs/development/libraries/haskell/tls/1.2.3.nix
+++ b/pkgs/development/libraries/haskell/tls/1.2.6.nix
@@ -7,8 +7,8 @@
 
 cabal.mkDerivation (self: {
   pname = "tls";
-  version = "1.2.3";
-  sha256 = "0vv81z5m223b90zzfp5dk376fh8yngyd8h9anrxjrqb4f3bycaxg";
+  version = "1.2.6";
+  sha256 = "16r60acz9q84dv91jms9qaqvc53r98761ap9ijj3pifizzxcyswi";
   buildDepends = [
     asn1Encoding asn1Types byteable cereal cipherAes cipherRc4
     cryptohash cryptoNumbers cryptoPubkey cryptoPubkeyTypes
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index a94bf643d934..533b12b3d981 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -2481,8 +2481,8 @@ let result = let callPackage = x : y : modifyPrio (newScope result.finalReturn x
   timeCompat = callPackage ../development/libraries/haskell/time-compat {};
 
   tls_1_1_5 = callPackage ../development/libraries/haskell/tls/1.1.5.nix {};
-  tls_1_2_3 = callPackage ../development/libraries/haskell/tls/1.2.3.nix {};
-  tls = self.tls_1_2_3;
+  tls_1_2_6 = callPackage ../development/libraries/haskell/tls/1.2.6.nix {};
+  tls = self.tls_1_2_6;
 
   tlsExtra = callPackage ../development/libraries/haskell/tls-extra {
     tls = self.tls_1_1_5;