diff --git a/environment.yml b/environment.yml
index f0d2ead..f72ac05 100644
--- a/environment.yml
+++ b/environment.yml
@@ -12,8 +12,8 @@ dependencies:
   - numpy=1.18.1
   - geojson=2.5.0
   - python-dateutil=2.8.1
-  - graph-tool
-  - cairo
+  - graph-tool=2.33
+  - cairo=1.16.0
   - scipy=1.5.0
   - pytest=5.4.1
   - pytest-cov=2.8.1
diff --git a/setup.py b/setup.py
index 1d9bf5b..2dda868 100644
--- a/setup.py
+++ b/setup.py
@@ -7,8 +7,8 @@
     "numpy ==1.18.1",
     "geojson ==2.5.0",
     "python-dateutil ==2.8.1",
-    "graph-tool",
-    "cairo",
+    "graph-tool ==2.33",
+    "cairo ==1.16.0",
     "scipy ==1.3.2",
     "ujson ==3.0.0",
     "more-itertools ==8.4.0",