diff --git a/.circleci/config.yml b/.circleci/config.yml
index 5c9301ec4a7..0cbbef4fdcd 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -9,6 +9,18 @@ version: 2.1
 orbs:
   win: circleci/windows@1.0.0
 
+commands:
+  checkout_merge:
+    description: "checkout merge branch"
+    steps:
+      - checkout
+      - run:
+          name: Checkout merge branch
+          command: |
+            set -ex
+            git fetch --force origin ${CIRCLE_BRANCH}/merge:merged/${CIRCLE_BRANCH}
+            git checkout "merged/$CIRCLE_BRANCH"
+
 binary_common: &binary_common
   parameters:
     # Edit these defaults to do a release`
@@ -60,7 +72,7 @@ jobs:
       - image: << parameters.wheel_docker_image >>
     resource_class: 2xlarge+
     steps:
-      - checkout
+      - checkout_merge
       - run: packaging/build_wheel.sh
       - store_artifacts:
           path: dist
@@ -75,7 +87,7 @@ jobs:
       - image: "soumith/conda-cuda"
     resource_class: 2xlarge+
     steps:
-      - checkout
+      - checkout_merge
       - run: packaging/build_conda.sh
       - store_artifacts:
           path: /opt/conda/conda-bld/linux-64
@@ -90,7 +102,7 @@ jobs:
       image: ubuntu-1604:201903-01
     resource_class: gpu.medium
     steps:
-    - checkout
+    - checkout_merge
     - run:
         name: Setup environment
         command: |
@@ -159,7 +171,7 @@ jobs:
       name: win/vs2019
       shell: bash.exe
     steps:
-      - checkout
+      - checkout_merge
       - run:
           command: |
             choco install miniconda3
@@ -173,7 +185,7 @@ jobs:
     macos:
       xcode: "9.0"
     steps:
-      - checkout
+      - checkout_merge
       - run:
           # Cannot easily deduplicate this as source'ing activate
           # will set environment variables which we need to propagate
@@ -195,7 +207,7 @@ jobs:
     macos:
       xcode: "9.0"
     steps:
-      - checkout
+      - checkout_merge
       - run:
           command: |
             curl -o conda.sh https://repo.anaconda.com/miniconda/Miniconda3-latest-MacOSX-x86_64.sh
diff --git a/.circleci/config.yml.in b/.circleci/config.yml.in
index 70d5a613508..fe094ebcd1c 100644
--- a/.circleci/config.yml.in
+++ b/.circleci/config.yml.in
@@ -9,6 +9,18 @@ version: 2.1
 orbs:
   win: circleci/windows@1.0.0
 
+commands:
+  checkout_merge:
+    description: "checkout merge branch"
+    steps:
+      - checkout
+      - run:
+          name: Checkout merge branch
+          command: |
+            set -ex
+            git fetch --force origin ${CIRCLE_BRANCH}/merge:merged/${CIRCLE_BRANCH}
+            git checkout "merged/$CIRCLE_BRANCH"
+
 binary_common: &binary_common
   parameters:
     # Edit these defaults to do a release`
@@ -60,7 +72,7 @@ jobs:
       - image: << parameters.wheel_docker_image >>
     resource_class: 2xlarge+
     steps:
-      - checkout
+      - checkout_merge
       - run: packaging/build_wheel.sh
       - store_artifacts:
           path: dist
@@ -75,7 +87,7 @@ jobs:
       - image: "soumith/conda-cuda"
     resource_class: 2xlarge+
     steps:
-      - checkout
+      - checkout_merge
       - run: packaging/build_conda.sh
       - store_artifacts:
           path: /opt/conda/conda-bld/linux-64
@@ -90,7 +102,7 @@ jobs:
       image: ubuntu-1604:201903-01
     resource_class: gpu.medium
     steps:
-    - checkout
+    - checkout_merge
     - run:
         name: Setup environment
         command: |
@@ -159,7 +171,7 @@ jobs:
       name: win/vs2019
       shell: bash.exe
     steps:
-      - checkout
+      - checkout_merge
       - run:
           command: |
             choco install miniconda3
@@ -173,7 +185,7 @@ jobs:
     macos:
       xcode: "9.0"
     steps:
-      - checkout
+      - checkout_merge
       - run:
           # Cannot easily deduplicate this as source'ing activate
           # will set environment variables which we need to propagate
@@ -195,7 +207,7 @@ jobs:
     macos:
       xcode: "9.0"
     steps:
-      - checkout
+      - checkout_merge
       - run:
           command: |
             curl -o conda.sh https://repo.anaconda.com/miniconda/Miniconda3-latest-MacOSX-x86_64.sh
diff --git a/.circleci/regenerate.py b/.circleci/regenerate.py
index 7e6fd747399..cc94e624bec 100755
--- a/.circleci/regenerate.py
+++ b/.circleci/regenerate.py
@@ -76,7 +76,8 @@ def generate_upload_workflow(base_workflow_name, os_type, btype, cu_version):
 
 
 def indent(indentation, data_list):
-    return ("\n" + " " * indentation).join(yaml.dump(data_list).splitlines())
+    return ("\n" + " " * indentation).join(
+        yaml.dump(data_list, default_flow_style=False).splitlines())
 
 
 if __name__ == "__main__":