diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 9259d40..6c52422 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "12.0.0"
+  ".": "12.0.1"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 195c3f9..f5e8c2d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## [12.0.1](https://github.com/npm/npm-package-arg/compare/v12.0.0...v12.0.1) (2024-12-10)
+### Bug Fixes
+* [`ea07a6e`](https://github.com/npm/npm-package-arg/commit/ea07a6edc71caae4db9342f90e03457edbb7bb24) [#197](https://github.com/npm/npm-package-arg/pull/197) allow for git usernames that start with a number (#197) (@wraithgar)
+### Chores
+* [`41aa799`](https://github.com/npm/npm-package-arg/commit/41aa799ee562f97d4bef48d0d08be8d4320bb219) [#196](https://github.com/npm/npm-package-arg/pull/196) bump @npmcli/template-oss from 4.23.3 to 4.23.4 (#196) (@dependabot[bot], @npm-cli-bot)
+
 ## [12.0.0](https://github.com/npm/npm-package-arg/compare/v11.0.3...v12.0.0) (2024-09-25)
 ### ⚠️ BREAKING CHANGES
 * `npm-package-arg` now supports node `^18.17.0 || >=20.5.0`
diff --git a/lib/npa.js b/lib/npa.js
index 8094b3e..e926058 100644
--- a/lib/npa.js
+++ b/lib/npa.js
@@ -17,6 +17,7 @@ const hasSlashes = isWindows ? /\\|[/]/ : /[/]/
 const isURL = /^(?:git[+])?[a-z]+:/i
 const isGit = /^[^@]+@[^:.]+\.[^:]+:.+$/i
 const isFilename = /[.](?:tgz|tar.gz|tar)$/i
+const isPortNumber = /:[0-9]+(\/|$)/i
 
 function npa (arg, where) {
   let name
@@ -324,7 +325,9 @@ function fromURL (res) {
     // git+ssh://git@my.custom.git.com:username/project.git#deadbeef
     // ...and various combinations. The username in the beginning is *required*.
     const matched = rawSpec.match(/^git\+ssh:\/\/([^:#]+:[^#]+(?:\.git)?)(?:#(.*))?$/i)
-    if (matched && !matched[1].match(/:[0-9]+\/?.*$/i)) {
+    // Filter out all-number "usernames" which are really port numbers
+    // They can either be :1234 :1234/ or :1234/path but not :12abc
+    if (matched && !matched[1].match(isPortNumber)) {
       res.type = 'git'
       setGitAttrs(res, matched[2])
       res.fetchSpec = matched[1]
diff --git a/package.json b/package.json
index 80baa3d..ab285eb 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "npm-package-arg",
-  "version": "12.0.0",
+  "version": "12.0.1",
   "description": "Parse the things that can be arguments to `npm install`",
   "main": "./lib/npa.js",
   "directories": {
@@ -18,7 +18,7 @@
   },
   "devDependencies": {
     "@npmcli/eslint-config": "^5.0.0",
-    "@npmcli/template-oss": "4.23.3",
+    "@npmcli/template-oss": "4.23.4",
     "tap": "^16.0.1"
   },
   "scripts": {
@@ -55,7 +55,7 @@
   },
   "templateOSS": {
     "//@npmcli/template-oss": "This file is partially managed by @npmcli/template-oss. Edits may be overwritten.",
-    "version": "4.23.3",
+    "version": "4.23.4",
     "publish": true
   }
 }
diff --git a/test/github.js b/test/github.js
index f4fa1f0..bd3d2a4 100644
--- a/test/github.js
+++ b/test/github.js
@@ -89,12 +89,37 @@ require('tap').test('basic', function (t) {
       raw: 'foo@bar/foo',
     },
 
+    'git@github.com:12345': {
+      name: undefined,
+      type: 'git',
+      saveSpec: 'git+ssh://git@github.com:12345',
+      fetchSpec: 'ssh://git@github.com:12345',
+      raw: 'git@github.com:12345',
+    },
+
+    'git@github.com:12345/': {
+      name: undefined,
+      type: 'git',
+      saveSpec: 'git+ssh://git@github.com:12345/',
+      fetchSpec: 'ssh://git@github.com:12345/',
+      raw: 'git@github.com:12345/',
+    },
+
     'git@github.com:12345/foo': {
       name: undefined,
       type: 'git',
       saveSpec: 'git+ssh://git@github.com:12345/foo',
+      fetchSpec: 'ssh://git@github.com:12345/foo',
       raw: 'git@github.com:12345/foo',
     },
+
+    'git@github.com:12345foo': {
+      name: undefined,
+      type: 'git',
+      saveSpec: 'git+ssh://git@github.com:12345foo',
+      fetchSpec: 'git@github.com:12345foo',
+      raw: 'git@github.com:12345foo',
+    },
   }
 
   Object.keys(tests).forEach(function (arg) {