diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 69c8ef0c10..b9748523e7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -5,8 +5,8 @@ on:
     branches:
       - '**'
   push:
-    branches:
-      - master
+    # branches:
+    #   - master
 
 jobs:
   lint:
@@ -66,7 +66,7 @@ jobs:
         run: yarn --non-interactive --frozen-lockfile
 
       - name: Run tests
-        run: yarn test:coverage --maxWorkers=2 --workerIdleMemoryLimit=2000MB --shard=${{ matrix.shard }}
+        run: yarn test:coverage --maxWorkers=1 --shard=${{ matrix.shard }}
 
       - name: Check for missing fixtures
         run: |
@@ -111,7 +111,7 @@ jobs:
         run: yarn --non-interactive --frozen-lockfile
 
       - name: Run slow tests & coverage
-        run: yarn test:slow:coverage --maxWorkers=2 --workerIdleMemoryLimit=2000MB --shard=${{ matrix.shard }}
+        run: yarn test:slow:coverage --maxWorkers=1 --shard=${{ matrix.shard }}
 
       - name: Check for missing fixtures
         run: |