diff --git a/moonstreamapi/moonstreamapi/admin/migrations/add_selectors.py b/moonstreamapi/moonstreamapi/admin/migrations/add_selectors.py
new file mode 100644
index 00000000..de0b96ea
--- /dev/null
+++ b/moonstreamapi/moonstreamapi/admin/migrations/add_selectors.py
@@ -0,0 +1,84 @@
+"""
+Add selectors to all moonworm tasks.
+"""
+import logging
+import json
+
+
+from bugout.exceptions import BugoutResponseException
+from web3 import Web3
+
+from ...settings import (
+    BUGOUT_REQUEST_TIMEOUT_SECONDS,
+    MOONSTREAM_ADMIN_ACCESS_TOKEN,
+    MOONSTREAM_MOONWORM_TASKS_JOURNAL,
+)
+from ...settings import bugout_client as bc
+from ...actions import get_all_entries_from_search
+
+logger = logging.getLogger(__name__)
+
+
+def fill_missing_selectors_in_moonworm_tasks() -> None:
+    """
+    Add selectors to all moonworm tasks.
+    """
+
+    batch_size = 100
+
+    moonworm_tasks = get_all_entries_from_search(
+        journal_id=MOONSTREAM_MOONWORM_TASKS_JOURNAL,
+        token=MOONSTREAM_ADMIN_ACCESS_TOKEN,
+        search_query="type:subscription !#version:2.0",
+        timeout=BUGOUT_REQUEST_TIMEOUT_SECONDS,
+    )
+
+    entries_tags = []
+
+    ## batch tasks
+
+    for task_batch in [
+        moonworm_tasks[i : i + batch_size]
+        for i in range(0, len(moonworm_tasks), batch_size)
+    ]:
+        for task in task_batch:
+            tags = ["#version:2.0"]
+
+            ## get abi
+            try:
+                abi = json.loads(task.content)
+            except Exception as e:
+                logger.warn(f"Unable to parse abi from task: {task.id}")
+                continue
+
+            if not any([tag.startswith("selector:") for tag in task.tags]):
+                ## generate selector
+
+                abi_selector = Web3.keccak(
+                    text=abi["name"]
+                    + "("
+                    + ",".join(map(lambda x: x["type"], abi["inputs"]))
+                    + ")"
+                )[:4].hex()
+
+                tags.append(f"#selector:{abi_selector}")
+
+            entries_tags.append(
+                {
+                    "entry_id": task.entry_url.split("/")[-1],  ## 😭
+                    "tags": tags,
+                }
+            )
+
+        ## update entries
+
+        try:
+            bc.create_entries_tags(
+                journal_id=MOONSTREAM_MOONWORM_TASKS_JOURNAL,
+                token=MOONSTREAM_ADMIN_ACCESS_TOKEN,
+                entries_tags=entries_tags,
+                timeout=15,
+            )
+        except BugoutResponseException as e:
+            logger.error(f"Unable to update entries tags: {e}")
+            continue