diff --git a/heat-equation/Cargo.toml b/heat-equation/Cargo.toml
index 74fa830..0ad6c80 100644
--- a/heat-equation/Cargo.toml
+++ b/heat-equation/Cargo.toml
@@ -9,4 +9,4 @@ edition = "2018"
 sbp = { path = "../sbp", features = ["sparse"] }
 ndarray = "0.13.1"
 plotters = { version = "0.3.0", default-features = false, features = ["bitmap_gif", "bitmap_backend", "line_series"] }
-sprs = "0.7.0"
+sprs = { version = "0.9.0", default-features = false }