diff --git a/setup.py b/setup.py
index d6aaf78..6482228 100644
--- a/setup.py
+++ b/setup.py
@@ -47,7 +47,7 @@ def read(fname):
     packages=setuptools.find_packages(),
     include_package_data=True,
     install_requires=[
-        "ecmwflibs==0.5.5",
+        "ecmwflibs==0.5.3",
         "netCDF4", 
         "dask[array]",
         "Magics",