diff --git a/node-src/git/git.ts b/node-src/git/git.ts
index c1db28f69..6e2e25618 100644
--- a/node-src/git/git.ts
+++ b/node-src/git/git.ts
@@ -90,6 +90,29 @@ export async function getBranch() {
   }
 }
 
+// Retrieve the hash of all uncommitted files, which includes staged, unstaged, and untracked files,
+// excluding deleted files (which can't be hashed) and ignored files. There is no one single Git
+// command to reliably get this information, so we use a combination of commands grouped together.
+export async function getUncommittedHash() {
+  const listStagedFiles = 'git diff --name-only --diff-filter=d --cached';
+  const listUnstagedFiles = 'git diff --name-only --diff-filter=d';
+  const listUntrackedFiles = 'git ls-files --others --exclude-standard';
+  const listUncommittedFiles = [listStagedFiles, listUnstagedFiles, listUntrackedFiles].join(';');
+
+  const uncommittedHash = (
+    await execGitCommand(
+      // Pass the combined list of filenames to hash-object to retrieve a list of hashes. Then pass
+      // the list of hashes to hash-object again to retrieve a single hash of all hashes. We use
+      // stdin to avoid the limit on command line arguments.
+      `(${listUncommittedFiles}) | git hash-object --stdin-paths | git hash-object --stdin`
+    )
+  ).trim();
+
+  // In case there are no uncommited changes (empty list), we always get this same hash.
+  const noChangesHash = 'e69de29bb2d1d6434b8b29ae775ad8c2e48c5391';
+  return uncommittedHash === noChangesHash ? '' : uncommittedHash;
+}
+
 export async function hasPreviousCommit() {
   const result = await execGitCommand(`git --no-pager log -n 1 --skip=1 --format="%H"`);
   return !!result.trim();
diff --git a/node-src/index.ts b/node-src/index.ts
index 38d98f37a..0e9212e87 100644
--- a/node-src/index.ts
+++ b/node-src/index.ts
@@ -14,7 +14,7 @@ import checkPackageJson from './lib/checkPackageJson';
 import { writeChromaticDiagnostics } from './lib/writeChromaticDiagnostics';
 import invalidPackageJson from './ui/messages/errors/invalidPackageJson';
 import noPackageJson from './ui/messages/errors/noPackageJson';
-import { getBranch, getCommit, getSlug } from './git/git';
+import { getBranch, getCommit, getSlug, getUncommittedHash } from './git/git';
 
 /**
  Make keys of `T` outside of `R` optional.
@@ -112,11 +112,12 @@ export async function runAll(ctx, options?: Options) {
   }
 }
 
-export type GitInfo = {
+export interface GitInfo {
   branch: string;
   commit: string;
   slug: string;
-};
+  uncommittedHash: string;
+}
 
 export async function getGitInfo(): Promise<GitInfo> {
   const branch = await getBranch();
@@ -126,5 +127,6 @@ export async function getGitInfo(): Promise<GitInfo> {
   const [ownerName, repoName, ...rest] = slug ? slug.split('/') : [];
   const isValidSlug = !!ownerName && !!repoName && !rest.length;
 
-  return { branch, commit, slug: isValidSlug ? slug : '' };
+  const uncommittedHash = await getUncommittedHash();
+  return { branch, commit, slug: isValidSlug ? slug : '', uncommittedHash };
 }
diff --git a/node-src/main.test.ts b/node-src/main.test.ts
index 425d4fbc2..e3de1d5a0 100644
--- a/node-src/main.test.ts
+++ b/node-src/main.test.ts
@@ -264,6 +264,7 @@ jest.mock('./git/git', () => ({
   getVersion: () => Promise.resolve('2.24.1'),
   getChangedFiles: () => Promise.resolve(['src/foo.stories.js']),
   getRepositoryRoot: () => Promise.resolve(process.cwd()),
+  getUncommittedHash: () => Promise.resolve('abc123'),
 }));
 
 jest.mock('./git/getParentCommits', () => ({
diff --git a/node-src/tasks/gitInfo.test.ts b/node-src/tasks/gitInfo.test.ts
index 8b658991a..a25a4fdaf 100644
--- a/node-src/tasks/gitInfo.test.ts
+++ b/node-src/tasks/gitInfo.test.ts
@@ -17,6 +17,9 @@ const getChangedFilesWithReplacement = <
 >getChangedFilesWithReplacementUnmocked;
 const getSlug = <jest.MockedFunction<typeof git.getSlug>>git.getSlug;
 const getVersion = <jest.MockedFunction<typeof git.getVersion>>git.getVersion;
+const getUncommittedHash = <jest.MockedFunction<typeof git.getUncommittedHash>>(
+  git.getUncommittedHash
+);
 
 const getBaselineBuilds = <jest.MockedFunction<typeof getBaselineBuildsUnmocked>>(
   getBaselineBuildsUnmocked
@@ -42,6 +45,7 @@ const client = { runQuery: jest.fn(), setAuthorization: jest.fn() };
 
 beforeEach(() => {
   getCommitAndBranch.mockResolvedValue(commitInfo);
+  getUncommittedHash.mockResolvedValue('abc123');
   getParentCommits.mockResolvedValue(['asd2344']);
   getBaselineBuilds.mockResolvedValue([]);
   getChangedFilesWithReplacement.mockResolvedValue({ changedFiles: [] });
diff --git a/node-src/tasks/gitInfo.ts b/node-src/tasks/gitInfo.ts
index 9bdcc08a0..317d2e62c 100644
--- a/node-src/tasks/gitInfo.ts
+++ b/node-src/tasks/gitInfo.ts
@@ -1,7 +1,7 @@
 import picomatch from 'picomatch';
 
 import getCommitAndBranch from '../git/getCommitAndBranch';
-import { getSlug, getVersion } from '../git/git';
+import { getSlug, getUncommittedHash, getVersion } from '../git/git';
 import { getParentCommits } from '../git/getParentCommits';
 import { getBaselineBuilds } from '../git/getBaselineBuilds';
 import { exitCodes, setExitCode } from '../lib/setExitCode';
@@ -62,8 +62,12 @@ export const setGitInfo = async (ctx: Context, task: Task) => {
   } = ctx.options;
 
   ctx.git = {
-    version: await getVersion(),
     ...(await getCommitAndBranch(ctx, { branchName, patchBaseRef, ci })),
+    uncommittedHash: await getUncommittedHash().catch((e) => {
+      ctx.log.warn('Failed to retrieve uncommitted files hash', e);
+      return null;
+    }),
+    version: await getVersion(),
   };
 
   if (!ctx.git.slug) {
diff --git a/node-src/types.ts b/node-src/types.ts
index 96219cb75..23b799c0d 100644
--- a/node-src/types.ts
+++ b/node-src/types.ts
@@ -144,6 +144,7 @@ export interface Context {
     committedAt: number;
     slug?: string;
     mergeCommit?: string;
+    uncommittedHash?: string;
     parentCommits?: string[];
     baselineCommits?: string[];
     changedFiles?: string[];
diff --git a/package.json b/package.json
index dc742ad19..cf5fe93e3 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "chromatic",
-  "version": "6.21.0",
+  "version": "6.22.0-canary.5",
   "description": "Automate visual testing across browsers. Gather UI feedback. Versioned documentation.",
   "keywords": [
     "storybook-addon",