diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index d29104fa..4a207154 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -1,4 +1,4 @@
 # Lines starting with '#' are comments.
 # Each line is a file pattern followed by one or more owners.
 
-*                                   @MetaMask/shared-libraries-engineers
+*                                   @MetaMask/wallet-framework-engineers
diff --git a/.github/workflows/security-code-scanner.yml b/.github/workflows/security-code-scanner.yml
new file mode 100644
index 00000000..ced04497
--- /dev/null
+++ b/.github/workflows/security-code-scanner.yml
@@ -0,0 +1,43 @@
+name: 'MetaMask Security Code Scanner'
+
+on:
+  push:
+    branches: ['main']
+  pull_request:
+    branches: ['main']
+
+jobs:
+  run-security-scan:
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+    steps:
+      - name: MetaMask Security Code Scanner
+        uses: MetaMask/Security-Code-Scanner@main
+        with:
+          repo: ${{ github.repository }}
+          paths_ignored: |
+            .storybook/
+            '**/__snapshots__/'
+            '**/*.snap'
+            '**/*.stories.js'
+            '**/*.stories.tsx'
+            '**/*.test.browser.ts*'
+            '**/*.test.js*'
+            '**/*.test.ts*'
+            '**/fixtures/'
+            '**/jest.config.js'
+            '**/jest.environment.js'
+            '**/mocks/'
+            '**/test*/'
+            docs/
+            e2e/
+            merged-packages/
+            node_modules
+            storybook/
+            test*/
+          rules_excluded: example
+          project_metrics_token: ${{ secrets.SECURITY_SCAN_METRICS_TOKEN }}
+          slack_webhook: ${{ secrets.APPSEC_BOT_SLACK_WEBHOOK }}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c33ecaf4..6cdaab68 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,20 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [12.1.2]
+### Fixed
+- Update `@metamask/eth-block-tracker` from `^9.0.2` to `^9.0.3` ([#306](https://github.com/MetaMask/eth-json-rpc-middleware/pull/306))
+  - Use updated versions of `@metamask/eth-json-rpc-engine` and `@metamask/eth-json-rpc-provider`
+- Update `@metamask/eth-json-rpc-provider` from `^2.1.0` to `^3.0.2` ([#306](https://github.com/MetaMask/eth-json-rpc-middleware/pull/306))
+  - Use updated version of `@metamask/eth-json-rpc-engine`
+- Update `@metamask/json-rpc-engine` from `^7.1.1` to `^8.0.2` ([#306](https://github.com/MetaMask/eth-json-rpc-middleware/pull/306))
+  - Maintenance updates
+
+## [12.1.1]
+### Fixed
+- Update from `eth-block-tracker@^8.0.0` to `@metamask/eth-block-tracker@^9.0.2` ([#303](https://github.com/MetaMask/eth-json-rpc-middleware/pull/303))
+  - Mitigates polling-loop related concurrency issue in the block tracker.
+
 ## [12.1.0]
 ### Added
 - Add `signatureMethod` property to `MessageParams` ([#273](https://github.com/MetaMask/eth-json-rpc-middleware/pull/273))
@@ -164,7 +178,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `json-rpc-engine@5.3.0` ([#53](https://github.com/MetaMask/eth-json-rpc-middleware/pull/53))
 - `eth-rpc-errors@3.0.0` ([#55](https://github.com/MetaMask/eth-json-rpc-middleware/pull/55))
 
-[Unreleased]: https://github.com/MetaMask/eth-json-rpc-middleware/compare/v12.1.0...HEAD
+[Unreleased]: https://github.com/MetaMask/eth-json-rpc-middleware/compare/v12.1.2...HEAD
+[12.1.2]: https://github.com/MetaMask/eth-json-rpc-middleware/compare/v12.1.1...v12.1.2
+[12.1.1]: https://github.com/MetaMask/eth-json-rpc-middleware/compare/v12.1.0...v12.1.1
 [12.1.0]: https://github.com/MetaMask/eth-json-rpc-middleware/compare/v12.0.1...v12.1.0
 [12.0.1]: https://github.com/MetaMask/eth-json-rpc-middleware/compare/v12.0.0...v12.0.1
 [12.0.0]: https://github.com/MetaMask/eth-json-rpc-middleware/compare/v11.0.2...v12.0.0
diff --git a/package.json b/package.json
index 827f3f4f..0802b1b0 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@metamask/eth-json-rpc-middleware",
-  "version": "12.1.0",
+  "version": "12.1.2",
   "description": "Ethereum-related json-rpc-engine middleware.",
   "repository": {
     "type": "git",
@@ -28,12 +28,12 @@
     "test:watch": "jest --watch"
   },
   "dependencies": {
-    "@metamask/eth-json-rpc-provider": "^2.1.0",
+    "@metamask/eth-block-tracker": "^9.0.3",
+    "@metamask/eth-json-rpc-provider": "^3.0.2",
     "@metamask/eth-sig-util": "^7.0.0",
-    "@metamask/json-rpc-engine": "^7.1.1",
+    "@metamask/json-rpc-engine": "^8.0.2",
     "@metamask/rpc-errors": "^6.0.0",
     "@metamask/utils": "^8.1.0",
-    "eth-block-tracker": "^8.0.0",
     "klona": "^2.0.6",
     "pify": "^5.0.0",
     "safe-stable-stringify": "^2.4.3"
diff --git a/src/block-cache.test.ts b/src/block-cache.test.ts
index 3073161f..34744593 100644
--- a/src/block-cache.test.ts
+++ b/src/block-cache.test.ts
@@ -1,6 +1,6 @@
+import { PollingBlockTracker } from '@metamask/eth-block-tracker';
 import { providerFromEngine } from '@metamask/eth-json-rpc-provider';
 import { JsonRpcEngine } from '@metamask/json-rpc-engine';
-import { PollingBlockTracker } from 'eth-block-tracker';
 import pify from 'pify';
 
 import { createBlockCacheMiddleware } from '.';
diff --git a/src/block-cache.ts b/src/block-cache.ts
index 5bfd7e47..cb4f48d7 100644
--- a/src/block-cache.ts
+++ b/src/block-cache.ts
@@ -1,6 +1,6 @@
+import type { PollingBlockTracker } from '@metamask/eth-block-tracker';
 import { createAsyncMiddleware } from '@metamask/json-rpc-engine';
 import type { Json, JsonRpcParams, JsonRpcRequest } from '@metamask/utils';
-import type { PollingBlockTracker } from 'eth-block-tracker';
 
 import { projectLogger, createModuleLogger } from './logging-utils';
 import type {
diff --git a/src/block-ref-rewrite.ts b/src/block-ref-rewrite.ts
index cdc993c8..95ff342c 100644
--- a/src/block-ref-rewrite.ts
+++ b/src/block-ref-rewrite.ts
@@ -1,7 +1,7 @@
+import type { PollingBlockTracker } from '@metamask/eth-block-tracker';
 import type { JsonRpcMiddleware } from '@metamask/json-rpc-engine';
 import { createAsyncMiddleware } from '@metamask/json-rpc-engine';
 import type { Json, JsonRpcParams } from '@metamask/utils';
-import type { PollingBlockTracker } from 'eth-block-tracker';
 
 import { blockTagParamIndex } from './utils/cache';
 
diff --git a/src/block-ref.test.ts b/src/block-ref.test.ts
index 89f8f7ce..2d5f8947 100644
--- a/src/block-ref.test.ts
+++ b/src/block-ref.test.ts
@@ -1,8 +1,8 @@
+import { PollingBlockTracker } from '@metamask/eth-block-tracker';
 import { providerFromEngine } from '@metamask/eth-json-rpc-provider';
 import type { SafeEventEmitterProvider } from '@metamask/eth-json-rpc-provider';
 import type { JsonRpcMiddleware } from '@metamask/json-rpc-engine';
 import { JsonRpcEngine } from '@metamask/json-rpc-engine';
-import { PollingBlockTracker } from 'eth-block-tracker';
 
 import { createBlockRefMiddleware } from '.';
 import {
diff --git a/src/block-ref.ts b/src/block-ref.ts
index 0146ee12..949031c0 100644
--- a/src/block-ref.ts
+++ b/src/block-ref.ts
@@ -1,3 +1,4 @@
+import type { PollingBlockTracker } from '@metamask/eth-block-tracker';
 import type { SafeEventEmitterProvider } from '@metamask/eth-json-rpc-provider';
 import type { JsonRpcMiddleware } from '@metamask/json-rpc-engine';
 import { createAsyncMiddleware } from '@metamask/json-rpc-engine';
@@ -6,7 +7,6 @@ import type {
   JsonRpcParams,
   PendingJsonRpcResponse,
 } from '@metamask/utils';
-import type { PollingBlockTracker } from 'eth-block-tracker';
 import { klona } from 'klona/full';
 import pify from 'pify';
 
diff --git a/src/block-tracker-inspector.ts b/src/block-tracker-inspector.ts
index eba414ec..6540cb28 100644
--- a/src/block-tracker-inspector.ts
+++ b/src/block-tracker-inspector.ts
@@ -1,3 +1,4 @@
+import type { PollingBlockTracker } from '@metamask/eth-block-tracker';
 import type { JsonRpcMiddleware } from '@metamask/json-rpc-engine';
 import { createAsyncMiddleware } from '@metamask/json-rpc-engine';
 import type {
@@ -5,7 +6,6 @@ import type {
   JsonRpcParams,
   PendingJsonRpcResponse,
 } from '@metamask/utils';
-import type { PollingBlockTracker } from 'eth-block-tracker';
 
 import { projectLogger, createModuleLogger } from './logging-utils';
 
diff --git a/src/retryOnEmpty.test.ts b/src/retryOnEmpty.test.ts
index b219b23c..27fefb3c 100644
--- a/src/retryOnEmpty.test.ts
+++ b/src/retryOnEmpty.test.ts
@@ -1,10 +1,10 @@
+import { PollingBlockTracker } from '@metamask/eth-block-tracker';
 import { providerFromEngine } from '@metamask/eth-json-rpc-provider';
 import type { SafeEventEmitterProvider } from '@metamask/eth-json-rpc-provider';
 import type { JsonRpcMiddleware } from '@metamask/json-rpc-engine';
 import { JsonRpcEngine } from '@metamask/json-rpc-engine';
 import { errorCodes, rpcErrors } from '@metamask/rpc-errors';
 import type { Json, JsonRpcParams, JsonRpcRequest } from '@metamask/utils';
-import { PollingBlockTracker } from 'eth-block-tracker';
 
 import { createRetryOnEmptyMiddleware } from '.';
 import type { ProviderRequestStub } from '../test/util/helpers';
diff --git a/src/retryOnEmpty.ts b/src/retryOnEmpty.ts
index b777f8c2..79d34a71 100644
--- a/src/retryOnEmpty.ts
+++ b/src/retryOnEmpty.ts
@@ -1,3 +1,4 @@
+import type { PollingBlockTracker } from '@metamask/eth-block-tracker';
 import type { SafeEventEmitterProvider } from '@metamask/eth-json-rpc-provider';
 import type { JsonRpcMiddleware } from '@metamask/json-rpc-engine';
 import { createAsyncMiddleware } from '@metamask/json-rpc-engine';
@@ -6,7 +7,6 @@ import type {
   JsonRpcParams,
   PendingJsonRpcResponse,
 } from '@metamask/utils';
-import type { PollingBlockTracker } from 'eth-block-tracker';
 import { klona } from 'klona/full';
 import pify from 'pify';
 
diff --git a/yarn.lock b/yarn.lock
index 48be516a..7a232982 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -928,6 +928,19 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@metamask/eth-block-tracker@npm:^9.0.3":
+  version: 9.0.3
+  resolution: "@metamask/eth-block-tracker@npm:9.0.3"
+  dependencies:
+    "@metamask/eth-json-rpc-provider": ^3.0.2
+    "@metamask/safe-event-emitter": ^3.0.0
+    "@metamask/utils": ^8.1.0
+    json-rpc-random-id: ^1.0.1
+    pify: ^5.0.0
+  checksum: edd3d59a0416752d90c8e2d8c10c31635dbe3eb323fcb054c401528afe4cbbb6a5a85aedd6ffee4a504d9779656bfab027f2274fd95981c90bf56b6f565dbca2
+  languageName: node
+  linkType: hard
+
 "@metamask/eth-json-rpc-middleware@workspace:.":
   version: 0.0.0-use.local
   resolution: "@metamask/eth-json-rpc-middleware@workspace:."
@@ -939,9 +952,10 @@ __metadata:
     "@metamask/eslint-config-jest": ^12.1.0
     "@metamask/eslint-config-nodejs": ^12.1.0
     "@metamask/eslint-config-typescript": ^12.1.0
-    "@metamask/eth-json-rpc-provider": ^2.1.0
+    "@metamask/eth-block-tracker": ^9.0.3
+    "@metamask/eth-json-rpc-provider": ^3.0.2
     "@metamask/eth-sig-util": ^7.0.0
-    "@metamask/json-rpc-engine": ^7.1.1
+    "@metamask/json-rpc-engine": ^8.0.2
     "@metamask/rpc-errors": ^6.0.0
     "@metamask/utils": ^8.1.0
     "@types/btoa": ^1.2.3
@@ -958,7 +972,6 @@ __metadata:
     eslint-plugin-n: ^15.7.0
     eslint-plugin-prettier: ^4.2.1
     eslint-plugin-promise: ^6.1.1
-    eth-block-tracker: ^8.0.0
     jest: ^27.5.1
     klona: ^2.0.6
     pify: ^5.0.0
@@ -972,14 +985,14 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@metamask/eth-json-rpc-provider@npm:^2.1.0":
-  version: 2.3.1
-  resolution: "@metamask/eth-json-rpc-provider@npm:2.3.1"
+"@metamask/eth-json-rpc-provider@npm:^3.0.2":
+  version: 3.0.2
+  resolution: "@metamask/eth-json-rpc-provider@npm:3.0.2"
   dependencies:
-    "@metamask/json-rpc-engine": ^7.3.1
+    "@metamask/json-rpc-engine": ^8.0.2
     "@metamask/safe-event-emitter": ^3.0.0
-    "@metamask/utils": ^8.2.0
-  checksum: fa0a987eb7e0dcff495489e95c358f6786a4a793a42ac900bb022027d27e6534ded743092e79a2191b9b4d760f418f39f6cfb99a5a5a0085f252016579be6865
+    "@metamask/utils": ^8.3.0
+  checksum: 0321eaad6fa205a9d3ddcfaf28e63c05291614893cb2e116151185a4acbd6bb6a508d6e556b3cb8bc4d3caef4bf0a638202d9b6bdc127fbcb81715eb2660a809
   languageName: node
   linkType: hard
 
@@ -997,24 +1010,24 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@metamask/json-rpc-engine@npm:^7.1.1, @metamask/json-rpc-engine@npm:^7.3.1":
-  version: 7.3.1
-  resolution: "@metamask/json-rpc-engine@npm:7.3.1"
+"@metamask/json-rpc-engine@npm:^8.0.2":
+  version: 8.0.2
+  resolution: "@metamask/json-rpc-engine@npm:8.0.2"
   dependencies:
-    "@metamask/rpc-errors": ^6.1.0
+    "@metamask/rpc-errors": ^6.2.1
     "@metamask/safe-event-emitter": ^3.0.0
-    "@metamask/utils": ^8.2.0
-  checksum: 4952eb4e70c0011d334fb4a9bf56aa2d68bef745c892dddd06f6ed7e6303fb95b3b60b4e32c88b6d77bfc5091acc8e71ad274f389419e4bdcc5741ef49cde87d
+    "@metamask/utils": ^8.3.0
+  checksum: c240d298ad503d93922a94a62cf59f0344b6d6644a523bc8ea3c0f321bea7172b89f2747a5618e2861b2e8152ae5086b76f391a10e4566529faa50b8850c051d
   languageName: node
   linkType: hard
 
-"@metamask/rpc-errors@npm:^6.0.0, @metamask/rpc-errors@npm:^6.1.0":
-  version: 6.1.0
-  resolution: "@metamask/rpc-errors@npm:6.1.0"
+"@metamask/rpc-errors@npm:^6.0.0, @metamask/rpc-errors@npm:^6.2.1":
+  version: 6.2.1
+  resolution: "@metamask/rpc-errors@npm:6.2.1"
   dependencies:
-    "@metamask/utils": ^8.1.0
+    "@metamask/utils": ^8.3.0
     fast-safe-stringify: ^2.0.6
-  checksum: 9f4821d804e2fcaa8987b0958d02c6d829b7c7db49740c811cb593f381d0c4b00dabb7f1802907f1b2f6126f7c0d83ec34219183d29650f5d24df014ac72906a
+  checksum: a9223c3cb9ab05734ea0dda990597f90a7cdb143efa0c026b1a970f2094fe5fa3c341ed39b1e7623be13a96b98fb2c697ef51a2e2b87d8f048114841d35ee0a9
   languageName: node
   linkType: hard
 
@@ -1025,9 +1038,9 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@metamask/utils@npm:^8.0.0, @metamask/utils@npm:^8.1.0, @metamask/utils@npm:^8.2.0":
-  version: 8.2.1
-  resolution: "@metamask/utils@npm:8.2.1"
+"@metamask/utils@npm:^8.0.0, @metamask/utils@npm:^8.1.0, @metamask/utils@npm:^8.3.0":
+  version: 8.4.0
+  resolution: "@metamask/utils@npm:8.4.0"
   dependencies:
     "@ethereumjs/tx": ^4.2.0
     "@noble/hashes": ^1.3.1
@@ -1037,7 +1050,8 @@ __metadata:
     pony-cause: ^2.1.10
     semver: ^7.5.4
     superstruct: ^1.0.3
-  checksum: 36a714a17e4949d2040bedb28d4373a22e7e86bb797aa2d59223f9799fd76e662443bcede113719c4e200f5e9d90a9d62feafad5028fff8b9a7a85fface097ca
+    uuid: ^9.0.1
+  checksum: b0397e97bac7192f6189a8625a2dfcb56d3c2cf4dd2cb3d4e012a7e9786f04f59f6917805544bc131a6dacd2c8344e237ae43ad47429bb5eb35c6cf1248440b4
   languageName: node
   linkType: hard
 
@@ -3046,19 +3060,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"eth-block-tracker@npm:^8.0.0":
-  version: 8.0.0
-  resolution: "eth-block-tracker@npm:8.0.0"
-  dependencies:
-    "@metamask/eth-json-rpc-provider": ^2.1.0
-    "@metamask/safe-event-emitter": ^3.0.0
-    "@metamask/utils": ^8.1.0
-    json-rpc-random-id: ^1.0.1
-    pify: ^5.0.0
-  checksum: 3416c2ee653f81d1f71f3a9b80e04837fb516494f64ded45c053dfc24c6c6ce8dac7e5b8376cd57f52838f43a93d20a8e17d4d875e50d1e4c267543ffe0e6ad8
-  languageName: node
-  linkType: hard
-
 "ethereum-cryptography@npm:^2.0.0, ethereum-cryptography@npm:^2.1.2":
   version: 2.1.2
   resolution: "ethereum-cryptography@npm:2.1.2"
@@ -6695,6 +6696,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"uuid@npm:^9.0.1":
+  version: 9.0.1
+  resolution: "uuid@npm:9.0.1"
+  bin:
+    uuid: dist/bin/uuid
+  checksum: 39931f6da74e307f51c0fb463dc2462807531dc80760a9bff1e35af4316131b4fc3203d16da60ae33f07fdca5b56f3f1dd662da0c99fea9aaeab2004780cc5f4
+  languageName: node
+  linkType: hard
+
 "v8-compile-cache-lib@npm:^3.0.1":
   version: 3.0.1
   resolution: "v8-compile-cache-lib@npm:3.0.1"