diff --git a/tests/fixtures/cython-import-package/setup.cfg b/tests/fixtures/cython-import-package/setup.cfg
index a43ee22b9b..022b7e9342 100644
--- a/tests/fixtures/cython-import-package/setup.cfg
+++ b/tests/fixtures/cython-import-package/setup.cfg
@@ -27,7 +27,7 @@ tests =
     pytest
     pytest-xdist
     pytest-cov
-    pytest-timeout
+    pytest-timeout==1.4.2
     readme-renderer[md]
     twine
 dev =
diff --git a/tests/fixtures/fake-package/setup.cfg b/tests/fixtures/fake-package/setup.cfg
index c357cea97a..5285f6cf3b 100644
--- a/tests/fixtures/fake-package/setup.cfg
+++ b/tests/fixtures/fake-package/setup.cfg
@@ -26,7 +26,7 @@ tests =
     pytest
     pytest-xdist
     pytest-cov
-    pytest-timeout
+    pytest-timeout==1.4.2
     readme-renderer[md]
     twine
 dev =
diff --git a/tests/fixtures/legacy-backend-package/setup.cfg b/tests/fixtures/legacy-backend-package/setup.cfg
index 1e5f1ed85d..74f299120f 100644
--- a/tests/fixtures/legacy-backend-package/setup.cfg
+++ b/tests/fixtures/legacy-backend-package/setup.cfg
@@ -27,7 +27,7 @@ tests =
     pytest
     pytest-xdist
     pytest-cov
-    pytest-timeout
+    pytest-timeout==1.4.2
     readme-renderer[md]
     twine
 dev =