diff --git a/ports/argparse/portfile.cmake b/ports/argparse/portfile.cmake
index e8558e7e4b0dfd..51908fbb81cd3c 100644
--- a/ports/argparse/portfile.cmake
+++ b/ports/argparse/portfile.cmake
@@ -3,8 +3,8 @@
 vcpkg_from_github(
     OUT_SOURCE_PATH SOURCE_PATH
     REPO p-ranav/argparse
-    REF 4f10f378c526c8570288daa92e269a26c6ea07ad # v2.8
-    SHA512 29dd57431cea73d88d6dfca58c76c2f14bfa9c661ed2b5dbfa517f8ed2504371ec68939a35dd01e26a50a45d8688169993e971dd98eca5e889ebb5bb6363592a
+    REF 997da9255618311d1fcb0135ce86022729d1f1cb # v2.9
+    SHA512 241e6a1ec76133b7ad4ab3984b1b4e08129f3dac80fc26a0010c9450ab83131ec9e2472844eba30265f2a6f1e94c7b7c07175f11a22553bd61a099b1bb148ef7
     HEAD_REF master
 )
 
diff --git a/ports/argparse/vcpkg.json b/ports/argparse/vcpkg.json
index 94365194d1d11d..458c0a98c74087 100644
--- a/ports/argparse/vcpkg.json
+++ b/ports/argparse/vcpkg.json
@@ -1,6 +1,6 @@
 {
   "name": "argparse",
-  "version": "2.8",
+  "version": "2.9",
   "description": "Argument parser for modern C++",
   "homepage": "https://github.com/p-ranav/argparse",
   "license": "MIT",
diff --git a/versions/a-/argparse.json b/versions/a-/argparse.json
index 4f2083cf4ae0d3..3f5371922e3e2b 100644
--- a/versions/a-/argparse.json
+++ b/versions/a-/argparse.json
@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "007156cde2fbc16b990f1a8cd0a29664873a923c",
+      "version": "2.9",
+      "port-version": 0
+    },
     {
       "git-tree": "e3bf81ce931b3f8abadb45bd70389073d703af8a",
       "version": "2.8",
diff --git a/versions/baseline.json b/versions/baseline.json
index 4149c350b29cd6..65e355d73bc3d6 100644
--- a/versions/baseline.json
+++ b/versions/baseline.json
@@ -181,7 +181,7 @@
       "port-version": 0
     },
     "argparse": {
-      "baseline": "2.8",
+      "baseline": "2.9",
       "port-version": 0
     },
     "args": {