diff --git a/setup.py b/setup.py
index 87bbf31d0..e3761b69e 100644
--- a/setup.py
+++ b/setup.py
@@ -62,9 +62,7 @@ install_requires = [
     "setuptools>=34.0.0",
     "nanotime>=0.5.2",
     "pyasn1>=0.4.1",
-    "schema>=0.6.7",
-    "schema>=0.6.7",
-    "voluptuous==0.11.7",
+    "voluptuous>=0.11.7",
     "jsonpath-ng>=1.4.3",
     "requests>=2.22.0",
     "grandalf==0.6",