diff --git a/Project.toml b/Project.toml
index e5255d7..bf6148c 100644
--- a/Project.toml
+++ b/Project.toml
@@ -48,7 +48,7 @@ Healpix = "3, 4"
 Interpolations = "0.13, 0.14, 0.15"
 JLD2 = "0.4"
 LazyArtifacts = "1"
-NonlinearSolve = "1, 2, 3"
+NonlinearSolve = "1, 2, 3, 4"
 Parameters = "0.12"
 PhysicalConstants = "0.2"
 Pixell = "0.2"