diff --git a/pkgs/development/haskell-modules/configuration-ghc-7.10.x.nix b/pkgs/development/haskell-modules/configuration-ghc-7.10.x.nix
index 5684d14cadd..d5c3e3c205b 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-7.10.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-7.10.x.nix
@@ -40,7 +40,7 @@ self: super: {
   mtl = self.mtl_2_2_2;
   parsec = self.parsec_3_1_13_0;
   parsec_3_1_13_0 = addBuildDepends super.parsec_3_1_13_0 [self.fail self.semigroups];
-  stm = self.stm_2_4_5_1;
+  stm = self.stm_2_5_0_0;
   text = self.text_1_2_3_0;
 
   # Build jailbreak-cabal with the latest version of Cabal.
diff --git a/pkgs/development/haskell-modules/configuration-ghc-8.0.x.nix b/pkgs/development/haskell-modules/configuration-ghc-8.0.x.nix
index a2868200423..168b569cf8c 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-8.0.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-8.0.x.nix
@@ -39,7 +39,7 @@ self: super: {
   # These are now core libraries in GHC 8.4.x.
   mtl = self.mtl_2_2_2;
   parsec = self.parsec_3_1_13_0;
-  stm = self.stm_2_4_5_1;
+  stm = self.stm_2_5_0_0;
   text = self.text_1_2_3_0;
 
   # https://github.com/bmillwood/applicative-quoters/issues/6