diff --git a/ui/src/Components/AlertAck/index.test.tsx b/ui/src/Components/AlertAck/index.test.tsx
index 5b1b9c94c..a8e122737 100644
--- a/ui/src/Components/AlertAck/index.test.tsx
+++ b/ui/src/Components/AlertAck/index.test.tsx
@@ -18,7 +18,7 @@ let alerts: APIAlertT[];
 let group: APIAlertGroupT;
 
 beforeEach(() => {
-  jest.useFakeTimers("modern");
+  jest.useFakeTimers();
   jest.setSystemTime(new Date(Date.UTC(2000, 1, 1, 0, 0, 0)));
 
   alertStore = new AlertStore([]);
diff --git a/ui/src/Components/AlertHistory/index.test.tsx b/ui/src/Components/AlertHistory/index.test.tsx
index 04bdc9330..9c2186cf2 100644
--- a/ui/src/Components/AlertHistory/index.test.tsx
+++ b/ui/src/Components/AlertHistory/index.test.tsx
@@ -57,7 +57,7 @@ const MockAlerts = (alertCount: number) => {
 };
 
 beforeEach(() => {
-  jest.useFakeTimers("modern");
+  jest.useFakeTimers();
   jest.setSystemTime(new Date(Date.UTC(2000, 1, 1, 0, 0, 0)));
 
   group = MockGroup("fakeGroup");
diff --git a/ui/src/Components/Fetcher/index.test.tsx b/ui/src/Components/Fetcher/index.test.tsx
index 73991bee8..4d86aca6e 100644
--- a/ui/src/Components/Fetcher/index.test.tsx
+++ b/ui/src/Components/Fetcher/index.test.tsx
@@ -19,7 +19,7 @@ let fetchSpy: any;
 let requestAnimationFrameSpy: any;
 
 beforeEach(() => {
-  jest.useFakeTimers("modern");
+  jest.useFakeTimers();
   jest.setSystemTime(new Date(Date.UTC(2000, 1, 1, 0, 0, 0)));
 
   alertStore = new AlertStore(["label=value"]);
diff --git a/ui/src/Components/Grid/AlertGrid/AlertGroup/Alert/index.test.tsx b/ui/src/Components/Grid/AlertGrid/AlertGroup/Alert/index.test.tsx
index 14e84ca01..3655b1f30 100644
--- a/ui/src/Components/Grid/AlertGrid/AlertGroup/Alert/index.test.tsx
+++ b/ui/src/Components/Grid/AlertGrid/AlertGroup/Alert/index.test.tsx
@@ -23,7 +23,7 @@ let silenceFormStore: SilenceFormStore;
 let grid: APIGridT;
 
 beforeEach(() => {
-  jest.useFakeTimers("modern");
+  jest.useFakeTimers();
   jest.setSystemTime(new Date(Date.UTC(2018, 7, 15, 20, 40, 0)));
   alertStore = new AlertStore([]);
   silenceFormStore = new SilenceFormStore();
diff --git a/ui/src/Components/Grid/AlertGrid/AlertGroup/GroupFooter/index.test.tsx b/ui/src/Components/Grid/AlertGrid/AlertGroup/GroupFooter/index.test.tsx
index ffbd2f427..58aa3c47c 100644
--- a/ui/src/Components/Grid/AlertGrid/AlertGroup/GroupFooter/index.test.tsx
+++ b/ui/src/Components/Grid/AlertGrid/AlertGroup/GroupFooter/index.test.tsx
@@ -54,7 +54,7 @@ beforeEach(() => {
   silenceFormStore = new SilenceFormStore();
   group = MockGroup();
 
-  jest.useFakeTimers("modern");
+  jest.useFakeTimers();
   jest.setSystemTime(new Date(Date.UTC(2000, 0, 1, 15, 0, 0)));
 
   alertStore.data.setReceivers(["by-cluster-service", "by-name"]);
diff --git a/ui/src/Components/Grid/AlertGrid/AlertGroup/Silences.test.tsx b/ui/src/Components/Grid/AlertGrid/AlertGroup/Silences.test.tsx
index 146427c07..106f8fc2a 100644
--- a/ui/src/Components/Grid/AlertGrid/AlertGroup/Silences.test.tsx
+++ b/ui/src/Components/Grid/AlertGrid/AlertGroup/Silences.test.tsx
@@ -15,7 +15,7 @@ describe("<RenderSilence />", () => {
     alertStore = new AlertStore([]);
     silenceFormStore = new SilenceFormStore();
 
-    jest.useFakeTimers("modern");
+    jest.useFakeTimers();
     jest.setSystemTime(new Date(Date.UTC(2000, 1, 1, 0, 0, 0)));
   });
 
diff --git a/ui/src/Components/Grid/AlertGrid/index.test.tsx b/ui/src/Components/Grid/AlertGrid/index.test.tsx
index ca13d78ad..7d11a2743 100644
--- a/ui/src/Components/Grid/AlertGrid/index.test.tsx
+++ b/ui/src/Components/Grid/AlertGrid/index.test.tsx
@@ -457,7 +457,7 @@ describe("<Grid />", () => {
   });
 
   it("doesn't throw errors after FontFaceObserver timeout", () => {
-    jest.useFakeTimers("modern");
+    jest.useFakeTimers();
     jest.setSystemTime(new Date(Date.UTC(2000, 1, 1, 0, 0, 0)));
 
     MockGroupList(1, 1);
diff --git a/ui/src/Components/ManagedSilence/DeleteSilence.test.tsx b/ui/src/Components/ManagedSilence/DeleteSilence.test.tsx
index 1bd0f8450..c7870654f 100644
--- a/ui/src/Components/ManagedSilence/DeleteSilence.test.tsx
+++ b/ui/src/Components/ManagedSilence/DeleteSilence.test.tsx
@@ -37,7 +37,7 @@ const generateUpstreams = (): APIAlertsResponseUpstreamsT => ({
 });
 
 beforeEach(() => {
-  jest.useFakeTimers("modern");
+  jest.useFakeTimers();
   jest.setSystemTime(new Date(Date.UTC(2000, 0, 1, 0, 30, 0)));
 
   alertStore = new AlertStore([]);
diff --git a/ui/src/Components/ManagedSilence/SilenceComment.test.tsx b/ui/src/Components/ManagedSilence/SilenceComment.test.tsx
index e506c638f..0201f1a3e 100644
--- a/ui/src/Components/ManagedSilence/SilenceComment.test.tsx
+++ b/ui/src/Components/ManagedSilence/SilenceComment.test.tsx
@@ -11,7 +11,7 @@ let silence: APISilenceT;
 let alertStore: AlertStore;
 
 beforeEach(() => {
-  jest.useFakeTimers("modern");
+  jest.useFakeTimers();
   jest.setSystemTime(new Date(Date.UTC(2000, 0, 1, 0, 30, 0)));
 
   silence = MockSilence();
diff --git a/ui/src/Components/ManagedSilence/SilenceDetails.test.tsx b/ui/src/Components/ManagedSilence/SilenceDetails.test.tsx
index f093a5856..c824c615f 100644
--- a/ui/src/Components/ManagedSilence/SilenceDetails.test.tsx
+++ b/ui/src/Components/ManagedSilence/SilenceDetails.test.tsx
@@ -45,7 +45,7 @@ beforeEach(() => {
   alertStore.data.setUpstreams(generateUpstreams());
 
   jest.restoreAllMocks();
-  jest.useFakeTimers("modern");
+  jest.useFakeTimers();
 });
 
 afterEach(() => {
diff --git a/ui/src/Components/ManagedSilence/index.test.tsx b/ui/src/Components/ManagedSilence/index.test.tsx
index c10105c44..5fc7a6855 100644
--- a/ui/src/Components/ManagedSilence/index.test.tsx
+++ b/ui/src/Components/ManagedSilence/index.test.tsx
@@ -17,7 +17,7 @@ let cluster: string;
 let silence: APISilenceT;
 
 beforeEach(() => {
-  jest.useFakeTimers("modern");
+  jest.useFakeTimers();
   jest.setSystemTime(new Date(Date.UTC(2000, 0, 1, 0, 30, 0)));
 
   alertStore = new AlertStore([]);
diff --git a/ui/src/Components/PaginatedAlertList/index.test.tsx b/ui/src/Components/PaginatedAlertList/index.test.tsx
index a9880107f..32c794845 100644
--- a/ui/src/Components/PaginatedAlertList/index.test.tsx
+++ b/ui/src/Components/PaginatedAlertList/index.test.tsx
@@ -8,7 +8,7 @@ import { PaginatedAlertList } from ".";
 let alertStore: AlertStore;
 
 beforeEach(() => {
-  jest.useFakeTimers("modern");
+  jest.useFakeTimers();
   jest.setSystemTime(new Date(Date.UTC(2000, 0, 1, 0, 30, 0)));
 
   alertStore = new AlertStore([]);
diff --git a/ui/src/Components/SilenceModal/Browser/index.test.tsx b/ui/src/Components/SilenceModal/Browser/index.test.tsx
index 4b19b29f1..a70cb497f 100644
--- a/ui/src/Components/SilenceModal/Browser/index.test.tsx
+++ b/ui/src/Components/SilenceModal/Browser/index.test.tsx
@@ -24,7 +24,7 @@ let silence: APISilenceT;
 declare let global: any;
 
 beforeEach(() => {
-  jest.useFakeTimers("modern");
+  jest.useFakeTimers();
   jest.setSystemTime(new Date(Date.UTC(2000, 0, 1, 0, 30, 0)));
 
   alertStore = new AlertStore([]);
diff --git a/ui/src/Components/SilenceModal/DateTimeSelect/index.test.tsx b/ui/src/Components/SilenceModal/DateTimeSelect/index.test.tsx
index 5914c2818..12317fb94 100644
--- a/ui/src/Components/SilenceModal/DateTimeSelect/index.test.tsx
+++ b/ui/src/Components/SilenceModal/DateTimeSelect/index.test.tsx
@@ -20,7 +20,7 @@ import {
 let silenceFormStore: SilenceFormStore;
 
 beforeEach(() => {
-  jest.useFakeTimers("modern");
+  jest.useFakeTimers();
 
   silenceFormStore = new SilenceFormStore();
   silenceFormStore.data.setStart(new Date(2060, 1, 1, 0, 0, 0));