diff --git a/maintainers/maintainer-list.nix b/maintainers/maintainer-list.nix
index 57906a857af9..79dab21bad9e 100644
--- a/maintainers/maintainer-list.nix
+++ b/maintainers/maintainer-list.nix
@@ -8347,6 +8347,14 @@
     githubId = 7385287;
     name = "Lana Black";
   };
+  grgi = {
+    name = "Gregor Giesen";
+    email = "gregor@giesen.net";
+    matrix = "@gregor:giesen.net";
+    github = "grgi";
+    githubId = 6435815;
+    keys = [ { fingerprint = "0F92 602B 1860 4476 77F4  8A67 C303 16AA C10F 3EA7"; } ];
+  };
   gridaphobe = {
     email = "eric@seidel.io";
     github = "gridaphobe";
diff --git a/pkgs/servers/sql/postgresql/ext/default.nix b/pkgs/servers/sql/postgresql/ext/default.nix
index 03ccb6ae531d..30cd54914119 100644
--- a/pkgs/servers/sql/postgresql/ext/default.nix
+++ b/pkgs/servers/sql/postgresql/ext/default.nix
@@ -72,6 +72,8 @@ in {
 
     pg_net = super.callPackage ./pg_net.nix { };
 
+    pg-semver = super.callPackage ./pg-semver.nix { };
+
     pgtap = super.callPackage ./pgtap.nix { };
 
     smlar = super.callPackage ./smlar.nix { };
diff --git a/pkgs/servers/sql/postgresql/ext/pg-semver.nix b/pkgs/servers/sql/postgresql/ext/pg-semver.nix
new file mode 100644
index 000000000000..50f48fb3172d
--- /dev/null
+++ b/pkgs/servers/sql/postgresql/ext/pg-semver.nix
@@ -0,0 +1,37 @@
+{
+  lib,
+  fetchFromGitHub,
+  postgresql,
+  postgresqlTestExtension,
+  testers,
+  buildPostgresqlExtension,
+}:
+
+buildPostgresqlExtension (finalAttrs: {
+  pname = "pg-semver";
+  version = "0.40.0";
+
+  src = fetchFromGitHub {
+    owner = "theory";
+    repo = "pg-semver";
+    rev = "refs/tags/v${finalAttrs.version}";
+    hash = "sha256-9f+QuGupjTUK3cQk7DFDrL7MOIwDE9SAUyVZ9RfrdDM=";
+  };
+
+  passthru.tests = {
+    version = testers.testVersion { package = finalAttrs.finalPackage; };
+    extension = postgresqlTestExtension {
+      inherit (finalAttrs) finalPackage;
+      sql = "CREATE EXTENSION semver;";
+    };
+  };
+
+  meta = {
+    description = "Semantic version data type for PostgreSQL";
+    homepage = "https://github.com/theory/pg-semver";
+    changelog = "https://github.com/theory/pg-semver/blob/main/Changes";
+    maintainers = with lib.maintainers; [ grgi ];
+    inherit (postgresql.meta) platforms;
+    license = lib.licenses.postgresql;
+  };
+})