diff --git a/requirements.txt b/requirements.txt
index 3cb310ef..ae3b34c6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,10 @@ lxml>=2.3
 argparse
 pyparsing>=2.1.10
 requests>=1.1.0
-pyproj==2.6.1
-Shapely==2.0.1
-OWSLib==0.28.1
-geojson==3.0.1
+cython==0.29.36; python_version < '3.9'
+pyproj==2.6.1; python_version < '3.9'
+pyproj==3.6.1; python_version >= '3.9'
+
+Shapely==2.0.4
+OWSLib==0.31.0
+geojson==3.1.0
\ No newline at end of file