diff --git a/setup.py b/setup.py
index 25dc77b..79297bd 100644
--- a/setup.py
+++ b/setup.py
@@ -34,6 +34,7 @@
     tests_require=[
         'pytest>=7.2.2, <8.4.0',
         'coverage>=7.2.2, <7.7.0',
-        'pytest-cov>=4.0, <6.1'
+        'pytest-cov>=4.0, <6.1',
+        'testfixtures>=8.3.0, <= 10.0.0'
     ]
 )
diff --git a/test-requirements.txt b/test-requirements.txt
index 5e0dd9d..db773b4 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,4 +1,4 @@
 pytest>=7.2.2, <8.4.0
 pytest-mock~=3.14.0
 coverage>=7.2.2, <7.7.0
-testfixtures~=8.2.0
+testfixtures>=8.3.0, <= 10.0.0