diff --git a/requirements.txt b/requirements.txt
index 49092925..0e1e2763 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 git-lfs
-natcap.invest
+git+https://github.com/natcap/invest.git@release/3.15.0
 pint
 setuptools_scm
 sphinx