package: fix requirements 2

Author: Marcello-Sega

setup.py

@@ -127,7 +127,8 @@ def run_tests(self):
     install_requires=[
         'MDAnalysis>=1.0.0', 'PyWavelets>=0.5.2', 'numpy>=1.16',
         'scipy>=1.6', 'scikit-image>=0.14.2', 'cython>=0.24.1',
-        'sphinx>=1.4.3', 'matplotlib', 'pytest', 'dask>=1.1.1'
+        'sphinx>=1.4.3', 'matplotlib', 'pytest', 'dask>=1.1.1',
+        'gsd<=3.2.1'
     ],
 
     # List additional groups of dependencies here (e.g. development