diff --git a/environment-gpu.yml b/environment-gpu.yml
index 2b8f6027..28410de1 100644
--- a/environment-gpu.yml
+++ b/environment-gpu.yml
@@ -15,7 +15,7 @@ dependencies:
   - gdal=2.4.1
   - tqdm=4.31.1
   - matplotlib=3.1.0
-  - rtree=0.8.3
+  - rtree=0.9.1
   - urllib3=1.24.3
   - networkx=2.3
   - rasterio=1.0.24
diff --git a/environment.yml b/environment.yml
index 1fb2ce13..f38b22a6 100644
--- a/environment.yml
+++ b/environment.yml
@@ -11,11 +11,12 @@ dependencies:
   - pandas=0.24.2
   - geopandas>=0.4.1,<0.6.0
   - opencv=3.4.4
+  - libspatialindex
   - numpy=1.16.3
   - gdal=2.4.1
   - tqdm=4.31.1
   - matplotlib=3.1.0
-  - rtree=0.8.3
+  - rtree=0.9.1
   - urllib3=1.24.3
   - networkx=2.3
   - rasterio=1.0.23