diff --git a/setup.py b/setup.py
index 197f09a6c7564435adb18f4b9e367e39fba85952..e5df81bca0f1c0eed4fd6e34297ec713e6011be9 100755
--- a/setup.py
+++ b/setup.py
@@ -158,10 +158,10 @@ def setup_package():
         python_requires='>=3.6',
         package_dir={'': 'src'},
         install_requires=['lxml>=3.6.4',
-                          'PyYaml>=3.12', 'future', 'PySocks>=1.6.7', "jsonschema"],
+                          'PyYaml>=3.12', 'future', 'PySocks>=1.6.7', "jsonschema==3.2.0"],
         extras_require={'keyring': ['keyring>=13.0.0']},
         setup_requires=["pytest-runner>=2.0,<3dev"],
-        tests_require=["pytest", "pytest-cov", "coverage>=4.4.2", "jsonschema"],
+        tests_require=["pytest", "pytest-cov", "coverage>=4.4.2", "jsonschema==3.2.0"],
         package_data={
             'caosdb': ['cert/indiscale.ca.crt', 'schema-pycaosdb-ini.yml'],
         },