diff --git a/setup.py b/setup.py
index 16011e881..ff4465b51 100644
--- a/setup.py
+++ b/setup.py
@@ -77,11 +77,11 @@ tests_requirements = [
     "wheel>=0.31.1",
     "pydot>=1.2.4",
     # Test requirements:
-    "pytest>=4.4.0",
-    "pytest-timeout>=1.3.3",
-    "pytest-cov>=2.6.1",
-    "pytest-xdist>=1.26.1",
-    "pytest-mock>=1.10.4",
+    "pytest==4.4.0",
+    "pytest-timeout==1.3.3",
+    "pytest-cov==2.6.1",
+    "pytest-xdist==1.26.1",
+    "pytest-mock==1.10.4",
     "flaky>=3.5.3",
     "mock>=3.0.0",
     "xmltodict>=0.11.0",