diff --git a/pyproject.toml b/pyproject.toml
index 7031aea..78f7701 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "socketdev"
-version = "3.0.20"
+version = "3.0.21"
 requires-python = ">= 3.9"
 dependencies = [
     'requests',
@@ -123,4 +123,4 @@ docstring-code-format = false
 #
 # This only has an effect when the `docstring-code-format` setting is
 # enabled.
-docstring-code-line-length = "dynamic"
\ No newline at end of file
+docstring-code-line-length = "dynamic"
diff --git a/socketdev/fullscans/__init__.py b/socketdev/fullscans/__init__.py
index 94439f9..25af73a 100644
--- a/socketdev/fullscans/__init__.py
+++ b/socketdev/fullscans/__init__.py
@@ -895,4 +895,35 @@ def gfm(self, org_slug: str, before: str, after: str) -> dict:
 
         error_message = response.json().get("error", {}).get("message", "Unknown error")
         log.error(f"Error getting diff scan results: {response.status_code}, message: {error_message}")
-        return {}
\ No newline at end of file
+        return {}
+
+    def finalize_tier1(
+        self,
+        full_scan_id: str,
+        tier1_reachability_scan_id: str,
+    ) -> bool:
+        """
+        Finalize a tier 1 reachability scan by associating it with a full scan.
+
+        Args:
+            full_scan_id: The ID of the full scan to associate with the tier 1 scan
+            tier1_reachability_scan_id: The tier 1 reachability scan ID from the facts file
+
+        Returns:
+            True if successful, False otherwise
+        """
+        path = "tier1-reachability-scan/finalize"
+        payload = json.dumps({
+            "tier1_reachability_scan_id": tier1_reachability_scan_id,
+            "report_run_id": full_scan_id
+        })
+
+        response = self.api.do_request(
+            path=path,
+            method="POST",
+            payload=payload
+        )
+
+        if response.status_code in (200, 201, 204):
+            return True
+        return False
\ No newline at end of file
diff --git a/socketdev/version.py b/socketdev/version.py
index 7c6f3ae..3a43c58 100644
--- a/socketdev/version.py
+++ b/socketdev/version.py
@@ -1 +1 @@
-__version__ = "3.0.20"
+__version__ = "3.0.21"