diff --git a/requirements_linux.txt b/requirements_linux.txt
index 21c859a27..aa0047cad 100644
--- a/requirements_linux.txt
+++ b/requirements_linux.txt
@@ -31,3 +31,4 @@ h3
 pygmt
 reportlab
 netCDF4
+igraph
diff --git a/requirements_macos.txt b/requirements_macos.txt
index 6343cc8bd..18aff5f43 100644
--- a/requirements_macos.txt
+++ b/requirements_macos.txt
@@ -28,3 +28,4 @@ h3
 pygmt
 reportlab
 netCDF4
+Igraph
diff --git a/requirements_win64.txt b/requirements_win64.txt
index 2d4d5f36f..279925ceb 100644
--- a/requirements_win64.txt
+++ b/requirements_win64.txt
@@ -35,3 +35,4 @@ h3
 pygmt
 reportlab
 netCDF4
+igraph
diff --git a/setup.py b/setup.py
index 5aabcbc73..a22b6ceb4 100644
--- a/setup.py
+++ b/setup.py
@@ -75,6 +75,7 @@ def get_version():
         'h3',
         'reportlab',
         'netCDF4',
+        'igraph',
         # 'GDAL',
     ],
     python_requires='>=3.8',