diff --git a/package.json b/package.json
index 347e299101..4dfaa26909 100644
--- a/package.json
+++ b/package.json
@@ -253,6 +253,7 @@
     "ms": "^2.1.3",
     "multicodec": "^3.0.1",
     "multihashes": "^4.0.2",
+    "nock": "^13.3.3",
     "node-vibrant": "^3.2.1-alpha.1",
     "numbro": "^2.3.6",
     "polished": "^3.3.2",
diff --git a/src/setupTests.ts b/src/setupTests.ts
index 12e1506aaa..a024eeb79f 100644
--- a/src/setupTests.ts
+++ b/src/setupTests.ts
@@ -7,6 +7,7 @@ import 'polyfills'
 import type { createPopper } from '@popperjs/core'
 import { useWeb3React } from '@web3-react/core'
 import failOnConsole from 'jest-fail-on-console'
+import { disableNetConnect, restore as restoreNetConnect } from 'nock'
 import { Readable } from 'stream'
 import { toBeVisible } from 'test-utils/matchers'
 import { mocked } from 'test-utils/mocked'
@@ -116,6 +117,15 @@ beforeEach(() => {
 
   // Mock useWeb3React to return a chainId of 1 by default.
   mocked(useWeb3React).mockReturnValue({ chainId: 1 } as ReturnType<typeof useWeb3React>)
+
+  // Disable network connections by default.
+  disableNetConnect()
+})
+
+afterEach(() => {
+  // Without this, nock causes a memory leak and the tests will fail on CI.
+  // https://github.com/nock/nock/issues/1817
+  restoreNetConnect()
 })
 
 /**
diff --git a/yarn.lock b/yarn.lock
index 0789991833..e8435e0e72 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -15606,6 +15606,16 @@ no-case@^3.0.4:
     lower-case "^2.0.2"
     tslib "^2.0.3"
 
+nock@^13.3.3:
+  version "13.3.3"
+  resolved "https://registry.yarnpkg.com/nock/-/nock-13.3.3.tgz#179759c07d3f88ad3e794ace885629c1adfd3fe7"
+  integrity sha512-z+KUlILy9SK/RjpeXDiDUEAq4T94ADPHE3qaRkf66mpEhzc/ytOMm3Bwdrbq6k1tMWkbdujiKim3G2tfQARuJw==
+  dependencies:
+    debug "^4.1.0"
+    json-stringify-safe "^5.0.1"
+    lodash "^4.17.21"
+    propagate "^2.0.0"
+
 node-abi@^3.3.0:
   version "3.47.0"
   resolved "https://registry.yarnpkg.com/node-abi/-/node-abi-3.47.0.tgz#6cbfa2916805ae25c2b7156ca640131632eb05e8"
@@ -17156,6 +17166,11 @@ prop-types@^15.5.10, prop-types@^15.6.0, prop-types@^15.6.1, prop-types@^15.6.2,
     object-assign "^4.1.1"
     react-is "^16.13.1"
 
+propagate@^2.0.0:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/propagate/-/propagate-2.0.1.tgz#40cdedab18085c792334e64f0ac17256d38f9a45"
+  integrity sha512-vGrhOavPSTz4QVNuBNdcNXePNdNMaO1xj9yBeH1ScQPjk/rhg9sSlCXPhMkFuaNNW/syTvYqsnbIJxMBfRbbag==
+
 proxy-addr@~2.0.7:
   version "2.0.7"
   resolved "https://registry.yarnpkg.com/proxy-addr/-/proxy-addr-2.0.7.tgz#f19fe69ceab311eeb94b42e70e8c2070f9ba1025"
@@ -18405,9 +18420,9 @@ selfsigned@^2.0.1, selfsigned@^2.1.1:
     node-forge "^1"
 
 semver@^5.5.0:
-  version "5.7.1"
-  resolved "https://registry.yarnpkg.com/semver/-/semver-5.7.1.tgz#a954f931aeba508d307bbf069eff0c01c96116f7"
-  integrity sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==
+  version "5.7.2"
+  resolved "https://registry.yarnpkg.com/semver/-/semver-5.7.2.tgz#48d55db737c3287cd4835e17fa13feace1c41ef8"
+  integrity sha512-cBznnQ9KjJqU67B52RMC65CMarK2600WFnbkcaiwWq3xy/5haFJlshgnpjovMVJ+Hff49d8GEn0b87C5pDQ10g==
 
 semver@^6.0.0, semver@^6.1.1, semver@^6.1.2, semver@^6.3.0, semver@^6.3.1:
   version "6.3.1"