diff --git a/pkgs/servers/asterisk/default.nix b/pkgs/servers/asterisk/default.nix
index eb8560a98b35..eeefe0dcd14f 100644
--- a/pkgs/servers/asterisk/default.nix
+++ b/pkgs/servers/asterisk/default.nix
@@ -4,6 +4,7 @@
   lua, speex, libopus, opusfile, libogg,
   srtp, wget, curl, iksemel, pkg-config,
   autoconf, libtool, automake,
+  python39, writeScript,
   withOpus ? true,
 }:
 
@@ -92,9 +93,9 @@ let
     };
   };
 
-  pjproject_2_10 = fetchurl {
-    url = "https://raw.githubusercontent.com/asterisk/third-party/master/pjproject/2.10/pjproject-2.10.tar.bz2";
-    sha256 = "14qmddinm4bv51rl0wwg5133r64x5bd6inwbx27ahb2n0151m2if";
+  pjproject_2_12 = fetchurl {
+    url = "https://raw.githubusercontent.com/asterisk/third-party/master/pjproject/2.12/pjproject-2.12.tar.bz2";
+    hash = "sha256-T3q4r/4WCAZCNGnULxMnNKH9wEK7gkseV/sV8IPasHQ=";
   };
 
   mp3-202 = fetchsvn {
@@ -115,11 +116,17 @@ let
   versions = lib.mapAttrs (_: {version, sha256}: common {
     inherit version sha256;
     externals = {
-      "externals_cache/pjproject-2.10.tar.bz2" = pjproject_2_10;
+      "externals_cache/pjproject-2.12.tar.bz2" = pjproject_2_12;
       "addons/mp3" = mp3-202;
     };
   }) (lib.importJSON ./versions.json);
 
+  updateScript_python = python39.withPackages (p: with p; [ packaging beautifulsoup4 requests ]);
+  updateScript = writeScript "asterisk-update" ''
+    #!/usr/bin/env bash
+    exec ${updateScript_python}/bin/python ${toString ./update.py}
+  '';
+
 in {
   # Supported releases (as of 2022-04-05).
   # Source: https://wiki.asterisk.org/wiki/display/AST/Asterisk+Versions
@@ -131,6 +138,8 @@ in {
   # 19.x    Standard   2021-11-02  2022-11-02  2023-11-02
   asterisk-lts = versions.asterisk_18;
   asterisk-stable = versions.asterisk_19;
-  asterisk = versions.asterisk_19;
+  asterisk = versions.asterisk_19.overrideAttrs (o: {
+    passthru = (o.passthru or {}) // { inherit updateScript; };
+  });
 
 } // versions
diff --git a/pkgs/servers/asterisk/update.py b/pkgs/servers/asterisk/update.py
index 5a7fabf9d676..f8804744956f 100755
--- a/pkgs/servers/asterisk/update.py
+++ b/pkgs/servers/asterisk/update.py
@@ -1,8 +1,11 @@
 #!/usr/bin/env nix-shell
 #!nix-shell -i python3 -p python39 python39.pkgs.packaging python39.pkgs.beautifulsoup4 python39.pkgs.requests
+# mirrored in ./default.nix
 from packaging import version
 from bs4 import BeautifulSoup
 import re, requests, json
+import os, sys
+from pathlib import Path
 
 URL = "https://downloads.asterisk.org/pub/telephony/asterisk"
 
@@ -23,8 +26,10 @@ for mv in major_versions.keys():
         "sha256": sha
     }
 
+versions_path = Path(sys.argv[0]).parent / "versions.json"
+
 try:
-    with open("versions.json", "r") as in_file:
+    with open(versions_path, "r") as in_file:
         in_data = json.loads(in_file.read())
         for v in in_data.keys():
             print(v + ":", in_data[v]["version"], "->", out[v]["version"])
@@ -32,5 +37,5 @@ except:
     # nice to have for the PR, not a requirement
     pass
 
-with open("versions.json", "w") as out_file:
+with open(versions_path, "w") as out_file:
     out_file.write(json.dumps(out, sort_keys=True, indent=2) + "\n")
diff --git a/pkgs/servers/asterisk/versions.json b/pkgs/servers/asterisk/versions.json
index f11f5547c3ef..77023dac2c28 100644
--- a/pkgs/servers/asterisk/versions.json
+++ b/pkgs/servers/asterisk/versions.json
@@ -1,14 +1,14 @@
 {
   "asterisk_16": {
-    "sha256": "379c5529b9957c28734192999543486a0b0b24f6671b2e02e77cc809774e7ba9",
-    "version": "16.25.1"
+    "sha256": "201c92e591fc1db2c71b264907beef594d62d660168d42b5e83f9dc593b1bce0",
+    "version": "16.26.1"
   },
   "asterisk_18": {
-    "sha256": "9db0e94e005a91a5433fc11173247065a5c40c9a7ca946577908f65d130b888e",
-    "version": "18.11.1"
+    "sha256": "acbb58e5c3cd2b9c7c4506fa80b717c3c3c550ce9722ff0177b4f11f98725563",
+    "version": "18.12.1"
   },
   "asterisk_19": {
-    "sha256": "3e1fa31ef1de7813365dd8b98ef93744ff87902255472814d0232b955c794706",
-    "version": "19.3.1"
+    "sha256": "6b0b985163f20fcc8f8878069b8a9ee725eef4cfbdb1c1031fe3840fb32d7abe",
+    "version": "19.4.1"
   }
 }