diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 625220a..3ab481a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -29,6 +29,9 @@ jobs:
       - name: Ensure the code passes lints
         run: flake8 homu/
 
+      - name: Preinstall pinned Python dependencies
+        run: pip install -r requirements.txt
+
       - name: Install homu on the builder
         run: pip install -e .
 
diff --git a/requirements.txt b/requirements.txt
index 787f8b4..459d870 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,6 +6,7 @@ idna==3.6
 Jinja2==3.1.3
 MarkupSafe==2.1.5
 pip==20.0.2
+pluggy==1.5.0
 requests==2.31.0
 retrying==1.3.4
 setuptools==45.2.0
diff --git a/setup.py b/setup.py
index d69845c..74c16f7 100644
--- a/setup.py
+++ b/setup.py
@@ -20,10 +20,10 @@
         'retrying',
     ],
     setup_requires=[
-        'pytest-runner',
+        'pytest-runner<8',
     ],
     tests_require=[
-        'pytest',
+        'pytest<8',
     ],
     package_data={
         'homu': [