diff --git a/src/__tests__/fixtures/ssh-gitmodules.ini b/src/__tests__/fixtures/ssh-gitmodules.ini
new file mode 100644
index 0000000..970ee15
--- /dev/null
+++ b/src/__tests__/fixtures/ssh-gitmodules.ini
@@ -0,0 +1,3 @@
+[submodule "ports/mdBook"]
+  path = ports/mdBook
+  url = git@github.com:catppuccin/mdBook.git
diff --git a/src/__tests__/main.test.ts b/src/__tests__/main.test.ts
index b12dd55..bcaa02e 100644
--- a/src/__tests__/main.test.ts
+++ b/src/__tests__/main.test.ts
@@ -9,9 +9,14 @@ import {
   Submodule,
   updateToLatestCommit,
   updateToLatestTag,
+  getRemoteName,
 } from "../main";
 import { getExecOutput } from "@actions/exec";
-import { mdBookSubmodule, nvimSubmodule, vscodeIconsSubmodule } from "./utils";
+import {
+  mdBookSubmodule,
+  nvimSubmodule,
+  vscodeIconsSubmodule
+} from "./utils";
 import { getInput, setOutput } from "@actions/core";
 
 vi.mock("@actions/core", async () => {
@@ -62,6 +67,37 @@ test("parse GitHub Action inputs with no input submodules", async () => {
   expect(actual).toEqual(expected);
 });
 
+test.each([
+  ["ssh://user@host.xz:port/path/to/repo.git/", "port/path/to/repo"],
+  ["ssh://user@host.xz/path/to/repo.git/", "path/to/repo"],
+  ["ssh://host.xz:port/path/to/repo.git/", "port/path/to/repo"],
+  ["ssh://host.xz/path/to/repo.git/", "path/to/repo"],
+  ["ssh://user@host.xz/path/to/repo.git/", "path/to/repo"],
+  ["ssh://host.xz/path/to/repo.git/", "path/to/repo"],
+  ["ssh://user@host.xz/~user/path/to/repo.git/", "user/path/to/repo"],
+  ["ssh://host.xz/~user/path/to/repo.git/", "user/path/to/repo"],
+  ["ssh://user@host.xz/~/path/to/repo.git", "path/to/repo"],
+  ["ssh://host.xz/~/path/to/repo.git", "path/to/repo"],
+  ["user@host.xz:/path/to/repo.git/", "path/to/repo"],
+  ["host.xz:/path/to/repo.git/", "path/to/repo"],
+  ["user@host.xz:~user/path/to/repo.git/", "user/path/to/repo"],
+  ["host.xz:~user/path/to/repo.git/", "user/path/to/repo"],
+  ["user@host.xz:path/to/repo.git", "path/to/repo"],
+  ["host.xz:path/to/repo.git", "path/to/repo"],
+  ["rsync://host.xz/path/to/repo.git/", "path/to/repo"],
+  ["git://host.xz/path/to/repo.git/", "path/to/repo"],
+  ["git://host.xz/~user/path/to/repo.git/", "user/path/to/repo"],
+  ["http://host.xz/path/to/repo.git/", "path/to/repo"],
+  ["https://host.xz/path/to/repo.git/", "path/to/repo"],
+  ["/path/to/repo.git/", "path/to/repo"],
+  ["path/to/repo.git/", "path/to/repo"],
+  ["~/path/to/repo.git", "path/to/repo"],
+  ["file:///path/to/repo.git/", "path/to/repo"],
+  ["file://~/path/to/repo.git/", "path/to/repo"],
+])('getRemoteName(%s) -> %s', (url, expected) => {
+  expect(getRemoteName(url)).toBe(expected)
+})
+
 test("extract single submodule from .gitmodules", async () => {
   const input = await readFile("src/__tests__/fixtures/single-gitmodules.ini");
   const expected = [mdBookSubmodule()];
@@ -93,6 +129,39 @@ test("extract single submodule from .gitmodules", async () => {
   expect(actual).toEqual(expected);
 });
 
+test("extract single submodule from .gitmodules with ssh-style url", async () => {
+  const input = await readFile("src/__tests__/fixtures/ssh-gitmodules.ini");
+  const submodule = mdBookSubmodule()
+  submodule.url = "git@github.com:catppuccin/mdBook.git"
+  const expected = [submodule];
+
+  vi.mocked(getExecOutput)
+    .mockReturnValueOnce(
+      Promise.resolve({
+        exitCode: 0,
+        stdout: `\n${expected[0].previousCommitSha}`,
+        stderr: "",
+      })
+    )
+    .mockReturnValueOnce(
+      Promise.resolve({
+        exitCode: 0,
+        stdout: `\n${expected[0].previousTag}`,
+        stderr: "",
+      })
+    )
+    .mockReturnValueOnce(
+      Promise.resolve({
+        exitCode: 0,
+        stdout: `\n${expected[0].previousTag}`,
+        stderr: "",
+      })
+    );
+
+  const actual = await parseGitmodules(input);
+  expect(actual).toEqual(expected);
+});
+
 test("extract single submodule from .gitmodules that has no tags", async () => {
   const input = await readFile("src/__tests__/fixtures/single-gitmodules.ini");
   const expected = [mdBookSubmodule()];
diff --git a/src/main.ts b/src/main.ts
index d5e200a..c8d46a5 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -14,8 +14,8 @@ const gitmodulesSchema = z.record(
   z.string(),
   z.object({
     path: z.string(),
-    url: z.string().url(),
-  })
+    url: z.string().regex(/[A-Za-z][A-Za-z0-9+.-]*/),
+  }),
 );
 
 export type Inputs = {
@@ -84,6 +84,34 @@ export const readFile = async (path: string): Promise<string> => {
   });
 };
 
+export const getRemoteName = (url: string) => {
+  url = url.replace(/\.git\/?/, "")
+
+  let startIndex = url.length - 1;
+
+  // Scan backwards to find separator.
+  while (startIndex >= 0) {
+    if (url[startIndex] == "~" || url[startIndex] == ":") {
+      startIndex++;
+      break;
+    } else if (url[startIndex] == ".") {
+      break;
+    }
+
+    startIndex--;
+  }
+
+  // If we broke on a dot, we _probably_ hit a domain label, so
+  // scan forward until we hit a slash.
+  if (url[startIndex] == ".") {
+    while (url[startIndex] != "/") {
+      startIndex++;
+    }
+  }
+
+  return url.substring(startIndex).replace(/^\/+/, "");
+}
+
 export const parseGitmodules = async (
   content: string
 ): Promise<Submodule[]> => {
@@ -94,8 +122,7 @@ export const parseGitmodules = async (
       const name = key.split('"')[1].trim();
       const path = values.path.replace(/"/g, "").trim();
       const url = values.url.replace(/"/g, "").trim();
-      const urlParts = url.replace(".git", "").split("/");
-      const remoteName = `${urlParts[3]}/${urlParts[4]}`;
+      const remoteName = getRemoteName(url);
       const [previousCommitSha, previousShortCommitSha] = await getCommit(path);
       const previousCommitShaHasTag = await hasTag(path, previousCommitSha);
       const previousTag = await getPreviousTag(path);