diff --git a/HISTORY.rst b/HISTORY.rst
index cb32acd81..242210fc0 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -2,6 +2,10 @@
 
 Release History
 ===============
+0.1.29
+++++++
+* `azdev setup`: Pin pip to 20.2.4.
+
 0.1.28
 ++++++
 * [Linter] Fix minor display issue in `azdev linter`.
diff --git a/azdev/__init__.py b/azdev/__init__.py
index 76eeb4b7f..8ad625142 100644
--- a/azdev/__init__.py
+++ b/azdev/__init__.py
@@ -4,4 +4,4 @@
 # license information.
 # -----------------------------------------------------------------------------
 
-__VERSION__ = '0.1.28'
+__VERSION__ = '0.1.29'
diff --git a/azdev/operations/setup.py b/azdev/operations/setup.py
index 87aa4968e..54e019a31 100644
--- a/azdev/operations/setup.py
+++ b/azdev/operations/setup.py
@@ -311,8 +311,8 @@ def setup(cli_path=None, ext_repo_path=None, ext=None, deps=None):
     # install packages
     subheading('Installing packages')
 
-    # upgrade to latest pip
-    pip_cmd('install --upgrade pip -q', 'Upgrading pip...')
+    # Use pip==20.2.4, due to https://github.com/pypa/pip/issues/9284
+    pip_cmd('install --upgrade pip==20.2.4 -q', 'Installing pip==20.2.4...')
 
     _install_cli(cli_path, deps=deps)
     _install_extensions(ext_to_install)