diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b05c10f1e1..cf2266d06a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -323,7 +323,9 @@ jobs:
         ${{ matrix.pre-command }}
         # Use the development version of Briefcase
         python -m pip install -U pip
-        python -m pip install git+https://github.com/beeware/briefcase.git
+        # python -m pip install git+https://github.com/beeware/briefcase.git
+        # TODO: Use the stable release of Briefcase so that binary packages are available.
+        python -m pip install briefcase==0.3.19
 
     - name: Test App
       working-directory: testbed
diff --git a/changes/2771.misc.rst b/changes/2771.misc.rst
new file mode 100644
index 0000000000..8444f40be5
--- /dev/null
+++ b/changes/2771.misc.rst
@@ -0,0 +1 @@
+Testbed CI was temporarily reverted to use briefcase 0.3.19.