diff --git a/action-src/main.ts b/action-src/main.ts
index 0940e34a8..1bb88d904 100755
--- a/action-src/main.ts
+++ b/action-src/main.ts
@@ -93,6 +93,7 @@ async function run() {
     const autoAcceptChanges = getInput('autoAcceptChanges');
     const branchName = getInput('branchName');
     const buildScriptName = getInput('buildScriptName');
+    const commitSha = getInput('commitSha');
     const debug = getInput('debug');
     const diagnostics = getInput('diagnostics');
     const dryRun = getInput('dryRun');
@@ -120,7 +121,7 @@ async function run() {
     const junitReport = getInput('junitReport');
 
     process.env.CHROMATIC_ACTION = 'true';
-    process.env.CHROMATIC_SHA = sha;
+    process.env.CHROMATIC_SHA = commitSha || sha;
     process.env.CHROMATIC_BRANCH = branchName || branch;
     process.env.CHROMATIC_SLUG = repositorySlug || slug;
     if (mergeCommit) {
diff --git a/action.yml b/action.yml
index ea50b29d0..cc4189899 100755
--- a/action.yml
+++ b/action.yml
@@ -21,6 +21,9 @@ inputs:
   buildScriptName:
     description: 'The npm script that builds your Storybook [build-storybook]'
     required: false
+  commitSha:
+    description: 'Override the commit SHA'
+    required: false
   debug:
     description: 'Output verbose debugging information'
     required: false