diff --git a/python_requirements.txt b/python_requirements.txt
index eeb91a87236d6fc50ed9d9aace7ae3b5a96d0114..4708c29a63ba393d5399e4a3dddcdae86c95ef3e 100644
--- a/python_requirements.txt
+++ b/python_requirements.txt
@@ -8,6 +8,7 @@ openpyxl
 OWSLib
 pandas
 pyproj
+rtree
 seaborn
 # GDAL, Fiona and Rasterio Python packages cannot be installed using PyPI on Windows
 # Also, the version of Shapely that comes through pip is unstable
diff --git a/python_requirements_v8p4.txt b/python_requirements_v8p4.txt
index 004fab262a4458a60766c1a125ba8ca5588bff5e..dd0cd53c947091c771188ad9ff5e8a0f4e1a80c4 100644
--- a/python_requirements_v8p4.txt
+++ b/python_requirements_v8p4.txt
@@ -105,6 +105,7 @@ requests==2.31.0
 rfc3339-validator==0.1.4
 rfc3986-validator==0.1.1
 rpds-py==0.12.0
+Rtree==1.1.0
 scipy==1.8.1
 seaborn==0.13.0
 Send2Trash==1.8.2
diff --git a/python_requirements_v8p5.txt b/python_requirements_v8p5.txt
index 7de6f915fda2cf6feda0843989352e3c5150a7cc..6dfe339e26f8377857818f1e0089d06bfdef60be 100644
--- a/python_requirements_v8p5.txt
+++ b/python_requirements_v8p5.txt
@@ -104,6 +104,7 @@ requests==2.31.0
 rfc3339-validator==0.1.4
 rfc3986-validator==0.1.1
 rpds-py==0.13.2
+Rtree==1.1.0
 scipy==1.11.4
 seaborn==0.13.0
 Send2Trash==1.8.2