diff --git a/pkgs/development/tools/parsing/happy/1.19.0.nix b/pkgs/development/tools/parsing/happy/1.19.1.nix
similarity index 83%
rename from pkgs/development/tools/parsing/happy/1.19.0.nix
rename to pkgs/development/tools/parsing/happy/1.19.1.nix
index 2ff2950591e..3ca5add9e6b 100644
--- a/pkgs/development/tools/parsing/happy/1.19.0.nix
+++ b/pkgs/development/tools/parsing/happy/1.19.1.nix
@@ -2,8 +2,8 @@
 
 cabal.mkDerivation (self: {
   pname = "happy";
-  version = "1.19.0";
-  sha256 = "1phk44crr1zi4sd3slxj1ik5ll799zl48k69z1miws3mxq6w076z";
+  version = "1.19.1";
+  sha256 = "0vhyv8pgj3cc31xx1vbdlhc01sfpl6xpzya79bvssnkian2n6yy2";
   isLibrary = false;
   isExecutable = true;
   buildDepends = [ mtl ];
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index 2b00a7e3888..7bd52e8b119 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -177,7 +177,7 @@ let result = let callPackage = x : y : modifyPrio (newScope result.finalReturn x
     cabalInstall = self.cabalInstall_1_18_0_2;
     alex         = self.alex_3_1_2;
     haddock      = self.haddock_2_13_2;
-    happy        = self.happy_1_19_0;
+    happy        = self.happy_1_19_1;
     primitive    = self.primitive_0_5_1_0;      # semi-official, but specified
   };
 
@@ -2474,8 +2474,8 @@ let result = let callPackage = x : y : modifyPrio (newScope result.finalReturn x
   happy_1_18_9 = callPackage ../development/tools/parsing/happy/1.18.9.nix {};
   happy_1_18_10 = callPackage ../development/tools/parsing/happy/1.18.10.nix {};
   happy_1_18_11 = callPackage ../development/tools/parsing/happy/1.18.11.nix {};
-  happy_1_19_0 = callPackage ../development/tools/parsing/happy/1.19.0.nix {};
-  happy = self.happy_1_19_0;
+  happy_1_19_1 = callPackage ../development/tools/parsing/happy/1.19.1.nix {};
+  happy = self.happy_1_19_1;
 
   happyMeta = callPackage ../development/tools/haskell/happy-meta {};