diff --git a/actions/autosync/README.md b/actions/autosync/README.md
index 546f7e58..187d6f1e 100644
--- a/actions/autosync/README.md
+++ b/actions/autosync/README.md
@@ -27,6 +27,7 @@ name: Example Workflow
 | oscal_model | OSCAL Model type to assemble. Values can be catalog, profile, compdef, or ssp. | None | True |
 | check_only | Runs tasks and exits with an error if there is a diff. Defaults to false | false | False |
 | github_token | GitHub token used to make authenticated API requests | None | False |
+| version | Version of the OSCAL model to set during assembly into JSON. | 1.0.0 | False |
 | skip_assemble | Skip assembly task. Defaults to false | false | False |
 | skip_regenerate | Skip regenerate task. Defaults to false. | false | False |
 | skip_items | Comma-separated glob patterns list of content by trestle name to skip during task execution. For example `profile_x,profile_y*,`. | None | False |
diff --git a/actions/autosync/action.yml b/actions/autosync/action.yml
index aff7384a..a96616db 100644
--- a/actions/autosync/action.yml
+++ b/actions/autosync/action.yml
@@ -16,6 +16,10 @@ inputs:
   github_token:
     description: "GitHub token used to make authenticated API requests"
     required: false
+  version:
+    description: "Version of the OSCAL model to set during assembly into JSON."
+    required: false
+    default: "1.0.0"
   skip_assemble:
     description: "Skip assembly task. Defaults to false"
     required: false
diff --git a/actions/autosync/auto-sync-entrypoint.sh b/actions/autosync/auto-sync-entrypoint.sh
index ba03a2d3..f4731450 100644
--- a/actions/autosync/auto-sync-entrypoint.sh
+++ b/actions/autosync/auto-sync-entrypoint.sh
@@ -22,7 +22,8 @@ command="trestlebot-autosync \
         --author-email=\"${INPUT_COMMIT_AUTHOR_EMAIL}\" \
         --working-dir=\"${INPUT_REPOSITORY}\" \
         --target-branch=\"${INPUT_TARGET_BRANCH}\" \
-        --skip-items=\"${INPUT_SKIP_ITEMS}\""
+        --skip-items=\"${INPUT_SKIP_ITEMS}\" \
+        --version=\"${INPUT_VERSION}\""
 
 # Conditionally include flags
 if [[ ${INPUT_SKIP_ASSEMBLE} == true ]]; then
diff --git a/tests/trestlebot/entrypoints/test_autosync.py b/tests/trestlebot/entrypoints/test_autosync.py
index 911cab8e..81f429bb 100644
--- a/tests/trestlebot/entrypoints/test_autosync.py
+++ b/tests/trestlebot/entrypoints/test_autosync.py
@@ -27,6 +27,7 @@ def valid_args_dict() -> Dict[str, str]:
         "committer-email": "test@email.com",
         "working-dir": ".",
         "file-patterns": ".",
+        "version": "0.1.0",
     }
 
 
diff --git a/trestlebot/entrypoints/autosync.py b/trestlebot/entrypoints/autosync.py
index eded0854..0cc451c6 100644
--- a/trestlebot/entrypoints/autosync.py
+++ b/trestlebot/entrypoints/autosync.py
@@ -66,6 +66,12 @@ def setup_autosync_arguments(self) -> None:
             help="Comma-separated list of glob patterns of the chosen model type to skip when running \
                 tasks",
         )
+        self.parser.add_argument(
+            "--version",
+            type=str,
+            required=False,
+            help="Version of the OSCAL model to set during assembly into JSON.",
+        )
         self.parser.add_argument(
             "--skip-assemble",
             required=False,
@@ -134,6 +140,7 @@ def run(self, args: argparse.Namespace) -> None:
                 assemble_task: AssembleTask = AssembleTask(
                     authored_object=authored_object,
                     markdown_dir=args.markdown_path,
+                    version=args.version,
                     model_filter=model_filter,
                 )
                 pre_tasks.append(assemble_task)