diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f3fbd3e3fe..69c8ef0c10 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -42,6 +42,9 @@ jobs:
   test:
     name: Test
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        shard: [1/3, 2/3, 3/3]
 
     steps:
       - name: Check out Git repository
@@ -63,7 +66,7 @@ jobs:
         run: yarn --non-interactive --frozen-lockfile
 
       - name: Run tests
-        run: yarn test:coverage --maxWorkers=2 --workerIdleMemoryLimit=2000MB
+        run: yarn test:coverage --maxWorkers=2 --workerIdleMemoryLimit=2000MB --shard=${{ matrix.shard }}
 
       - name: Check for missing fixtures
         run: |
@@ -84,6 +87,9 @@ jobs:
   testslow:
     name: Slow Tests
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        shard: [1/2, 2/2]
 
     steps:
       - name: Check out Git repository
@@ -105,7 +111,7 @@ jobs:
         run: yarn --non-interactive --frozen-lockfile
 
       - name: Run slow tests & coverage
-        run: yarn test:slow:coverage --maxWorkers=2 --workerIdleMemoryLimit=2000MB
+        run: yarn test:slow:coverage --maxWorkers=2 --workerIdleMemoryLimit=2000MB --shard=${{ matrix.shard }}
 
       - name: Check for missing fixtures
         run: |