diff --git a/.drone.jsonnet b/.drone.jsonnet
index d2a742d..08eed75 100644
--- a/.drone.jsonnet
+++ b/.drone.jsonnet
@@ -6,6 +6,7 @@ local PythonVersion(pyversion='3.6') = {
   },
   commands: [
     'pip install poetry poetry-dynamic-versioning -qq',
+    'poetry config experimental.new-installer false',
     'poetry install',
     'poetry version',
     'poetry run git-batch --help',
@@ -32,6 +33,7 @@ local PipelineLint = {
       commands: [
         'git fetch -tq',
         'pip install poetry poetry-dynamic-versioning -qq',
+        'poetry config experimental.new-installer false',
         'poetry install',
         'poetry run yapf -dr ./gitbatch',
       ],
@@ -45,6 +47,7 @@ local PipelineLint = {
       commands: [
         'git fetch -tq',
         'pip install poetry poetry-dynamic-versioning -qq',
+        'poetry config experimental.new-installer false',
         'poetry install',
         'poetry run flake8 ./gitbatch',
       ],
@@ -100,6 +103,7 @@ local PipelineSecurity = {
       commands: [
         'git fetch -tq',
         'pip install poetry poetry-dynamic-versioning -qq',
+        'poetry config experimental.new-installer false',
         'poetry install',
         'poetry run bandit -r ./gitbatch -x ./gitbatch/test',
       ],
@@ -177,24 +181,35 @@ local PipelineBuildPackage = {
 };
 
 local PipelineBuildContainer(arch='amd64') = {
+  local build = if arch == 'arm' then [{
+    name: 'build',
+    image: 'python:3.9-alpine',
+    commands: [
+      'apk add -Uq --no-cache build-base libressl-dev libffi-dev musl-dev python3-dev git cargo',
+      'git fetch -tq',
+      'pip install poetry poetry-dynamic-versioning -qq',
+      'poetry build',
+    ],
+    environment: {
+      CARGO_NET_GIT_FETCH_WITH_CLI: true,
+    },
+  }] else [{
+    name: 'build',
+    image: 'python:3.9',
+    commands: [
+      'git fetch -tq',
+      'pip install poetry poetry-dynamic-versioning -qq',
+      'poetry build',
+    ],
+  }],
+
   kind: 'pipeline',
   name: 'build-container-' + arch,
   platform: {
     os: 'linux',
     arch: arch,
   },
-  steps: [
-    {
-      name: 'build',
-      image: 'python:3.9-alpine',
-      commands: [
-        'apk --update --quiet add build-base libffi-dev musl-dev libressl-dev python3-dev cargo git',
-        'git fetch -tq',
-        'pip install --upgrade --no-cache-dir pip',
-        'pip install poetry poetry-dynamic-versioning -qq',
-        'poetry build',
-      ],
-    },
+  steps: build + [
     {
       name: 'dryrun',
       image: 'thegeeklab/drone-docker:19',
diff --git a/.drone.yml b/.drone.yml
index 712eada..cfaaec9 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -12,6 +12,7 @@ steps:
   commands:
   - git fetch -tq
   - pip install poetry poetry-dynamic-versioning -qq
+  - poetry config experimental.new-installer false
   - poetry install
   - poetry run yapf -dr ./gitbatch
   environment:
@@ -22,6 +23,7 @@ steps:
   commands:
   - git fetch -tq
   - pip install poetry poetry-dynamic-versioning -qq
+  - poetry config experimental.new-installer false
   - poetry install
   - poetry run flake8 ./gitbatch
   environment:
@@ -51,6 +53,7 @@ steps:
   image: python:3.6
   commands:
   - pip install poetry poetry-dynamic-versioning -qq
+  - poetry config experimental.new-installer false
   - poetry install
   - poetry version
   - poetry run git-batch --help
@@ -63,6 +66,7 @@ steps:
   image: python:3.7
   commands:
   - pip install poetry poetry-dynamic-versioning -qq
+  - poetry config experimental.new-installer false
   - poetry install
   - poetry version
   - poetry run git-batch --help
@@ -75,6 +79,7 @@ steps:
   image: python:3.8
   commands:
   - pip install poetry poetry-dynamic-versioning -qq
+  - poetry config experimental.new-installer false
   - poetry install
   - poetry version
   - poetry run git-batch --help
@@ -87,6 +92,7 @@ steps:
   image: python:3.9
   commands:
   - pip install poetry poetry-dynamic-versioning -qq
+  - poetry config experimental.new-installer false
   - poetry install
   - poetry version
   - poetry run git-batch --help
@@ -118,6 +124,7 @@ steps:
   commands:
   - git fetch -tq
   - pip install poetry poetry-dynamic-versioning -qq
+  - poetry config experimental.new-installer false
   - poetry install
   - poetry run bandit -r ./gitbatch -x ./gitbatch/test
   environment:
@@ -202,11 +209,9 @@ platform:
 
 steps:
 - name: build
-  image: python:3.9-alpine
+  image: python:3.9
   commands:
-  - apk --update --quiet add build-base libffi-dev musl-dev libressl-dev python3-dev cargo git
   - git fetch -tq
-  - pip install --upgrade --no-cache-dir pip
   - pip install poetry poetry-dynamic-versioning -qq
   - poetry build
 
@@ -282,11 +287,9 @@ platform:
 
 steps:
 - name: build
-  image: python:3.9-alpine
+  image: python:3.9
   commands:
-  - apk --update --quiet add build-base libffi-dev musl-dev libressl-dev python3-dev cargo git
   - git fetch -tq
-  - pip install --upgrade --no-cache-dir pip
   - pip install poetry poetry-dynamic-versioning -qq
   - poetry build
 
@@ -364,11 +367,12 @@ steps:
 - name: build
   image: python:3.9-alpine
   commands:
-  - apk --update --quiet add build-base libffi-dev musl-dev libressl-dev python3-dev cargo git
+  - apk add -Uq --no-cache build-base libressl-dev libffi-dev musl-dev python3-dev git cargo
   - git fetch -tq
-  - pip install --upgrade --no-cache-dir pip
   - pip install poetry poetry-dynamic-versioning -qq
   - poetry build
+  environment:
+    CARGO_NET_GIT_FETCH_WITH_CLI: true
 
 - name: dryrun
   image: thegeeklab/drone-docker:19
@@ -529,6 +533,6 @@ depends_on:
 
 ---
 kind: signature
-hmac: ba5d8a0fd0f6223e221c2d6f0f0af662b1c4dacf850bfb054fef4b3f83455906
+hmac: 9dfbb0e1e570c1891f0eef862e933b3e98cc268a96808481dd255a0e2fd3a4d7
 
 ...