diff --git a/manifest.dhall b/manifest.dhall
index d5bd274b720161e8ca2098c5bad49016578e1824..c31ecd5e02834044b69a1467eda39e6731ce1754 100644
--- a/manifest.dhall
+++ b/manifest.dhall
@@ -567,6 +567,7 @@ in  [ callHackage "Cabal" "3.8.1.0"
     , callHackage "some" "1.0.4"
     , callHackage "sop-core" "0.5.0.1"
     , callHackage "souffle-haskell" "3.5.0"
+    , callHackage "splitmix" "0.1.0.4"
     , callHackage "split" "0.2.3.3"
     , callHackage "sqlite-simple" "0.4.18.2"
     , callHackage "statistics" "0.16.1.0"
diff --git a/overlay.nix b/overlay.nix
index bc025f2a5a50d9eb35a1a6ce08b8a624d46c46d1..d894bca7fa4389d9f7e9b39ac7cd005b63de3f06 100644
--- a/overlay.nix
+++ b/overlay.nix
@@ -799,6 +799,8 @@ self: with pkgs.haskell.lib; {
 
   split = self.callPackage (./pkgs/split.nix) { };
 
+  splitmix = self.callPackage (./pkgs/splitmix.nix) { };
+
   sqlite-simple = self.callPackage (./pkgs/sqlite-simple.nix) { };
 
   statistics = self.callPackage (./pkgs/statistics.nix) { };
diff --git a/pkgs/splitmix.nix b/pkgs/splitmix.nix
new file mode 100644
index 0000000000000000000000000000000000000000..efaa9bcd90c0f1cb96a6c20973edd548aa09df78
--- /dev/null
+++ b/pkgs/splitmix.nix
@@ -0,0 +1,68 @@
+{ mkDerivation
+, async
+, base
+, base-compat
+, base-compat-batteries
+, bytestring
+, clock
+, containers
+, criterion
+, deepseq
+, HUnit
+, lib
+, math-functions
+, process
+, random
+, test-framework
+, test-framework-hunit
+, testu01
+, tf-random
+, vector
+}:
+mkDerivation {
+  pname = "splitmix";
+  version = "0.1.0.4";
+  sha256 = "6d065402394e7a9117093dbb4530a21342c9b1e2ec509516c8a8d0ffed98ecaa";
+  revision = "1";
+  editedCabalFile = "1iqlg2d4mybqwzwp67c5a1yxzd47cbp4f7mrpa6d0ckypis2akl0";
+  isLibrary = true;
+  isExecutable = false;
+  enableSeparateDataOutput = false;
+  libraryHaskellDepends = [ base deepseq ];
+  testHaskellDepends = [
+    async
+    base
+    base-compat
+    base-compat-batteries
+    bytestring
+    containers
+    deepseq
+    HUnit
+    math-functions
+    process
+    random
+    test-framework
+    test-framework-hunit
+    tf-random
+    vector
+  ];
+  testSystemDepends = [ testu01 ];
+  benchmarkHaskellDepends = [
+    base
+    clock
+    containers
+    criterion
+    random
+    tf-random
+  ];
+  enableLibraryProfiling = false;
+  enableExecutableProfiling = false;
+  doHaddock = false;
+  jailbreak = true;
+  doCheck = false;
+  doBenchmark = false;
+  hyperlinkSource = false;
+  description = "Fast Splittable PRNG";
+  license = lib.licenses.bsd3;
+  broken = false;
+}