diff --git a/package-lock.json b/package-lock.json
index 6424487..b4383bd 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5579,9 +5579,9 @@
       }
     },
     "node_modules/@web3-storage/filecoin-api": {
-      "version": "4.3.1",
-      "resolved": "https://registry.npmjs.org/@web3-storage/filecoin-api/-/filecoin-api-4.3.1.tgz",
-      "integrity": "sha512-1hbIqOWxGPqf4Oh+FH696ru9pWd6LdA680V6K3BEieWvZ4U9bpwqsvzWdJwACPYR7neqtoqbQSNQRIXkONVveg==",
+      "version": "4.4.0",
+      "resolved": "https://registry.npmjs.org/@web3-storage/filecoin-api/-/filecoin-api-4.4.0.tgz",
+      "integrity": "sha512-mT3QRC1Cbu0SDHMQjo1ZJFEH8dL4+8H6++wZOIm401bFSHXEamTkydQT3DfX9IHXAFSab/7kwkQ93yDwOgtXiA==",
       "dependencies": {
         "@ipld/dag-ucan": "^3.4.0",
         "@ucanto/client": "^9.0.0",
@@ -5589,7 +5589,7 @@
         "@ucanto/interface": "^9.0.0",
         "@ucanto/server": "^9.0.1",
         "@ucanto/transport": "^9.0.0",
-        "@web3-storage/capabilities": "^13.0.0",
+        "@web3-storage/capabilities": "^13.1.1",
         "@web3-storage/data-segment": "^4.0.0",
         "p-map": "^6.0.0"
       },
@@ -5609,9 +5609,9 @@
       }
     },
     "node_modules/@web3-storage/filecoin-api/node_modules/@web3-storage/capabilities": {
-      "version": "13.0.0",
-      "resolved": "https://registry.npmjs.org/@web3-storage/capabilities/-/capabilities-13.0.0.tgz",
-      "integrity": "sha512-SSviDXFweCu8FhaQ7BjsK1WDPBdwoduJhfD2DFRKkZT/V25vdBkqtW4qVc6tfO5IhTVxRpnn62PmbIbbcHzBRQ==",
+      "version": "13.1.1",
+      "resolved": "https://registry.npmjs.org/@web3-storage/capabilities/-/capabilities-13.1.1.tgz",
+      "integrity": "sha512-yQwrjhqwXGc1z8FCs7dCMsNp+G1LCrPq8RWCrflHA0rlISyMez6DQQpOJrCfao/MSk30nzPSzIm+FX/k3+8knw==",
       "dependencies": {
         "@ucanto/core": "^9.0.1",
         "@ucanto/interface": "^9.0.0",
@@ -15206,7 +15206,7 @@
         "@ucanto/transport": "^9.0.0",
         "@web3-storage/capabilities": "^12.0.3",
         "@web3-storage/data-segment": "^5.0.0",
-        "@web3-storage/filecoin-api": "^4.3.1",
+        "@web3-storage/filecoin-api": "^4.4.0",
         "@web3-storage/filecoin-client": "^3.1.3",
         "fzstd": "^0.1.0",
         "multiformats": "12.0.1",
@@ -15382,7 +15382,8 @@
         "@ucanto/server": "^9.0.1",
         "@ucanto/transport": "^9.0.0",
         "@w3filecoin/core": "*",
-        "@web3-storage/filecoin-api": "^4.3.1",
+        "@web3-storage/data-segment": "5.0.0",
+        "@web3-storage/filecoin-api": "^4.4.0",
         "@web3-storage/filecoin-client": "3.0.1",
         "uint8arrays": "^4.0.6"
       },
@@ -15484,6 +15485,16 @@
         "@ucanto/validator": "^9.0.0"
       }
     },
+    "packages/functions/node_modules/@web3-storage/data-segment": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/@web3-storage/data-segment/-/data-segment-5.0.0.tgz",
+      "integrity": "sha512-5CbElsxec2DsKhEHEh3XRGISAyna+bCjKjjvFrLcYyXLCaiSt/nF3ypcllxwjpE4newMUArymGKGzzZnRWL2kg==",
+      "dependencies": {
+        "@ipld/dag-cbor": "^9.0.5",
+        "multiformats": "^11.0.2",
+        "sync-multihash-sha2": "^1.0.0"
+      }
+    },
     "packages/functions/node_modules/tslib": {
       "version": "1.14.1",
       "dev": true,
diff --git a/packages/core/package.json b/packages/core/package.json
index 94697f6..24f8118 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -23,7 +23,7 @@
     "@ucanto/transport": "^9.0.0",
     "@web3-storage/capabilities": "^12.0.3",
     "@web3-storage/data-segment": "^5.0.0",
-    "@web3-storage/filecoin-api": "^4.3.1",
+    "@web3-storage/filecoin-api": "^4.4.0",
     "@web3-storage/filecoin-client": "^3.1.3",
     "fzstd": "^0.1.0",
     "multiformats": "12.0.1",
diff --git a/packages/functions/package.json b/packages/functions/package.json
index 66655a3..3e9a489 100644
--- a/packages/functions/package.json
+++ b/packages/functions/package.json
@@ -11,7 +11,8 @@
     "@ucanto/core": "^9.0.0",
     "@ucanto/server": "^9.0.1",
     "@ucanto/transport": "^9.0.0",
-    "@web3-storage/filecoin-api": "^4.3.1",
+    "@web3-storage/data-segment": "5.0.0",
+    "@web3-storage/filecoin-api": "^4.4.0",
     "@web3-storage/filecoin-client": "3.0.1",
     "@w3filecoin/core": "*"
   },
diff --git a/packages/functions/src/aggregator/handle-buffer-queue-message.js b/packages/functions/src/aggregator/handle-buffer-queue-message.js
index cd8ac87..f42ef98 100644
--- a/packages/functions/src/aggregator/handle-buffer-queue-message.js
+++ b/packages/functions/src/aggregator/handle-buffer-queue-message.js
@@ -4,6 +4,7 @@ import { createClient as createBufferStoreClient } from '@w3filecoin/core/src/st
 import { createClient as createBufferQueueClient, decodeMessage } from '@w3filecoin/core/src/queue/buffer-queue.js'
 import { createClient as createAggregateOfferQueueClient } from '@w3filecoin/core/src/queue/aggregate-offer-queue.js'
 import * as aggregatorEvents from '@web3-storage/filecoin-api/aggregator/events'
+import { Piece } from '@web3-storage/data-segment'
 
 import { mustGetEnv } from '../utils.js'
 
@@ -93,7 +94,14 @@ function getContext () {
     config: {
       maxAggregateSize,
       minAggregateSize,
-      minUtilizationFactor
+      minUtilizationFactor,
+      prependBufferedPieces: [{
+        // Small piece to prepend that is encoded as a CAR file
+        piece: Piece.fromString('bafkzcibciab3bwd67rgcoiejigar34jguwfasa5327hq3sjdcma3zz2ccupy4oi').link,
+        // will be prepended, so policy is irrelevant
+        policy: /** @type {import('@web3-storage/filecoin-api/src/aggregator/api').PiecePolicy} */ (0),
+        insertedAt: (new Date()).toISOString()
+      }]
     }
   }
 }