diff --git a/.github/workflows/hello-yaml-command.yaml b/.github/workflows/hello-yaml-command.yaml
new file mode 100644
index 000000000..a8e895efb
--- /dev/null
+++ b/.github/workflows/hello-yaml-command.yaml
@@ -0,0 +1,30 @@
+name: Hello yaml Command
+on:
+  repository_dispatch:
+    types: [hello-yaml-local-command]
+jobs:
+  helloYaml:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Add reaction
+        uses: peter-evans/create-or-update-comment@v4
+        with:
+          comment-id: ${{ github.event.client_payload.github.payload.comment.id }}
+          reactions: hooray
+
+      - name: Create URL to the run output
+        id: vars
+        run: echo "run-url=https://github.com/$GITHUB_REPOSITORY/actions/runs/$GITHUB_RUN_ID" >> $GITHUB_OUTPUT
+
+      - name: Create comment
+        uses: peter-evans/create-or-update-comment@v4
+        with:
+          issue-number: ${{ github.event.client_payload.github.payload.issue.number }}
+          body: |
+            Hello @${{ github.event.client_payload.github.actor }}!
+
+            This command was in a workflow file with the `.yaml` extension.
+
+            [Click here to see the command run output][1]
+
+            [1]: ${{ steps.vars.outputs.run-url }}
diff --git a/.github/workflows/slash-command-dispatch.yml b/.github/workflows/slash-command-dispatch.yml
index d7f810e1a..f972e7db8 100644
--- a/.github/workflows/slash-command-dispatch.yml
+++ b/.github/workflows/slash-command-dispatch.yml
@@ -19,6 +19,7 @@ jobs:
         with:
           token: ${{ secrets.REPO_ACCESS_TOKEN }}
           commands: |
+            hello-yaml-local
             hello-world-local
             ping-local
           permission: none
diff --git a/dist/index.js b/dist/index.js
index faf637755..a807129b7 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -350,7 +350,8 @@ class GitHubHelper {
     }
     createWorkflowDispatch(cmd, clientPayload) {
         return __awaiter(this, void 0, void 0, function* () {
-            const workflow = `${cmd.command}${cmd.event_type_suffix}.yml`;
+            const workflowName = `${cmd.command}${cmd.event_type_suffix}`;
+            const workflow = yield this.getWorkflow(cmd.repository, workflowName);
             const slashCommand = clientPayload.slash_command;
             const ref = slashCommand.args.named.ref
                 ? slashCommand.args.named.ref
@@ -366,8 +367,21 @@ class GitHubHelper {
                 if (count == 10)
                     break;
             }
-            yield this.octokit.request('POST /repos/{owner}/{repo}/actions/workflows/{workflow_id}/dispatches', Object.assign(Object.assign({}, this.parseRepository(cmd.repository)), { workflow_id: workflow, ref: ref, inputs: inputs }));
-            core.info(`Command '${cmd.command}' dispatched to workflow '${workflow}' in '${cmd.repository}'`);
+            yield this.octokit.request('POST /repos/{owner}/{repo}/actions/workflows/{workflow}/dispatches', Object.assign(Object.assign({}, this.parseRepository(cmd.repository)), { workflow: workflow, ref: ref, inputs: inputs }));
+            core.info(`Command '${cmd.command}' dispatched to workflow '${workflowName}' in '${cmd.repository}'`);
+        });
+    }
+    getWorkflow(repository, workflowName) {
+        return __awaiter(this, void 0, void 0, function* () {
+            core.debug(`Getting workflow ${workflowName} for repository ${repository}`);
+            const { data: workflows } = yield this.octokit.rest.actions.listRepoWorkflows(Object.assign({}, this.parseRepository(repository)));
+            for (const workflow of workflows.workflows) {
+                if (workflow.path === `${workflowName}.yml` || workflow.path === `${workflowName}.yaml`) {
+                    core.info(`Selecting workflow file ${workflow.path}`);
+                    return workflow.path;
+                }
+            }
+            throw new Error(`Workflow ${workflowName} not found`);
         });
     }
     getDefaultBranch(repository) {
diff --git a/docs/workflow-dispatch.md b/docs/workflow-dispatch.md
index 166d31367..ab957622b 100644
--- a/docs/workflow-dispatch.md
+++ b/docs/workflow-dispatch.md
@@ -19,7 +19,7 @@ There are significant differences in the action's behaviour when using `workflow
 
 It is important to name the `workflow_dispatch` event workflow correctly since the action targets the workflow based on its filename.
 The target filename is a combination of the command name and the `event-type-suffix`.
-Additionally, the file extension must be `.yml`.
+The file extensions `.yml` and `.yaml` are supported.
 
 For the following example configuration, the target workflows are:
 - `deploy-command.yml`
diff --git a/src/github-helper.ts b/src/github-helper.ts
index 31b96237f..387633c82 100644
--- a/src/github-helper.ts
+++ b/src/github-helper.ts
@@ -150,7 +150,8 @@ export class GitHubHelper {
     cmd: Command,
     clientPayload: ClientPayload
   ): Promise<void> {
-    const workflow = `${cmd.command}${cmd.event_type_suffix}.yml`
+    const workflowName = `${cmd.command}${cmd.event_type_suffix}`
+    const workflow = await this.getWorkflow(cmd.repository, workflowName)
     const slashCommand: SlashCommandPayload = clientPayload.slash_command
     const ref = slashCommand.args.named.ref
       ? slashCommand.args.named.ref
@@ -181,6 +182,28 @@ export class GitHubHelper {
     )
   }
 
+  private async getWorkflow(
+    repository: string,
+    workflowName: string
+  ): Promise<string> {
+    core.debug(`Getting workflow ${workflowName} for repository ${repository}`)
+    const {data: workflows} = await this.octokit.rest.actions.listRepoWorkflows(
+      {
+        ...this.parseRepository(repository)
+      }
+    )
+    for (const workflow of workflows.workflows) {
+      if (
+        workflow.path === `${workflowName}.yml` ||
+        workflow.path === `${workflowName}.yaml`
+      ) {
+        core.debug(`Selecting workflow file ${workflow.path}`)
+        return workflow.path
+      }
+    }
+    throw new Error(`Workflow ${workflowName} not found`)
+  }
+
   private async getDefaultBranch(repository: string): Promise<string> {
     const {data: repo} = await this.octokit.rest.repos.get({
       ...this.parseRepository(repository)