diff --git a/.circleci/config.yml b/.circleci/config.yml
deleted file mode 100644
index 90fa16504a9..00000000000
--- a/.circleci/config.yml
+++ /dev/null
@@ -1,33 +0,0 @@
-# Javascript Node CircleCI 2.0 configuration file
-#
-# Check https://circleci.com/docs/2.0/language-javascript/ for more details
-#
-version: 2
-jobs:
-  build:
-    docker:
-      # Service container image
-      - image: circleci/node:14.7.0
-
-    working_directory: ~/chain-events
-
-    steps:
-      # inital checkout
-      - checkout
-      - restore_cache:
-          key: dependency-cache-{{ checksum "yarn.lock" }}
-      - run:
-          name: update dependencies
-          command: yarn
-      - save_cache:
-          key: dependency-cache-{{ checksum "yarn.lock" }}
-          paths:
-            - ./node_modules
-      - run:
-          name: run tests
-          command: yarn test
-      - store_artifacts:
-          path: coverage
-      - run:
-          name: lint
-          command: yarn lint
\ No newline at end of file
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
new file mode 100644
index 00000000000..f7a854bdf40
--- /dev/null
+++ b/.github/workflows/build.yml
@@ -0,0 +1,42 @@
+name: Build
+on: [push]
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v1
+
+      - name: Setup Node
+        uses: actions/setup-node@v1
+        with:
+          node-version: 14.x
+
+      - name: Get yarn cache directory path
+        id: yarn-cache-dir-path
+        run: echo "::set-output name=dir::$(yarn cache dir)"
+
+      - uses: actions/cache@v2
+        id: yarn-cache # use this to check for `cache-hit` (`steps.yarn-cache.outputs.cache-hit != 'true'`)
+        with:
+          path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
+          key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-yarn-
+
+      - name: Install dependencies
+        run: yarn
+
+      - name: Run tests
+        run: yarn test
+
+      - name: Archive code coverage results
+        uses: actions/upload-artifact@v2
+        with:
+          name: code-coverage-report
+          path: coverage
+
+      - name: Run linter
+        run: yarn lint
\ No newline at end of file
diff --git a/src/substrate/storageFetcher.ts b/src/substrate/storageFetcher.ts
index 458c92fbd74..9d97734dfff 100644
--- a/src/substrate/storageFetcher.ts
+++ b/src/substrate/storageFetcher.ts
@@ -20,7 +20,7 @@ import {
 } from '@polkadot/types/interfaces';
 import { Codec } from '@polkadot/types/types';
 import { DeriveProposalImage } from '@polkadot/api-derive/types';
-import { hexToString, isFunction } from '@polkadot/util';
+import { isFunction } from '@polkadot/util';
 
 import { CWEvent, IStorageFetcher } from '../interfaces';
 import { factory, formatFilename } from '../logging';
@@ -45,7 +45,6 @@ import {
   IdentityJudgement,
   ITreasuryBountyBecameActive,
   ITreasuryBountyAwarded,
-  ITreasuryBountyClaimed,
   ITreasuryBountyEvents,
 } from './types';
 
diff --git a/test/unit/edgeware/storageFetcher.spec.ts b/test/unit/edgeware/storageFetcher.spec.ts
index c5240c275f2..e6bb897766f 100644
--- a/test/unit/edgeware/storageFetcher.spec.ts
+++ b/test/unit/edgeware/storageFetcher.spec.ts
@@ -10,7 +10,7 @@ import {
   Votes,
   Bounty,
 } from '@polkadot/types/interfaces';
-import { Vec, Data, TypeRegistry, Bytes } from '@polkadot/types';
+import { Vec, Data, TypeRegistry } from '@polkadot/types';
 import { Codec } from '@polkadot/types/types';
 import { stringToHex } from '@polkadot/util';
 import { DeriveReferendum } from '@polkadot/api-derive/democracy/types';
@@ -30,7 +30,6 @@ import {
   ICollectiveVoted,
   IdentityJudgement,
   ITreasuryBountyProposed,
-  ITreasuryBountyBecameActive,
 } from '../../../src/substrate/types';
 import { StorageFetcher } from '../../../src/substrate/storageFetcher';