diff --git a/sprs-ldl/Cargo.toml b/sprs-ldl/Cargo.toml
index f09105b0..2cfb29fd 100644
--- a/sprs-ldl/Cargo.toml
+++ b/sprs-ldl/Cargo.toml
@@ -18,4 +18,4 @@ sprs_suitesparse_ldl = { version = "0.8.0", path = "../suitesparse_bindings/sprs
 sprs_suitesparse_camd = { version = "0.3.0", path = "../suitesparse_bindings/sprs_suitesparse_camd", optional = true }
 
 [dev-dependencies]
-ndarray = ">=0.15.0,<=0.16"
+ndarray = ">=0.15.0, <=0.16"
diff --git a/sprs/Cargo.toml b/sprs/Cargo.toml
index 1c003565..b6722d02 100644
--- a/sprs/Cargo.toml
+++ b/sprs/Cargo.toml
@@ -21,7 +21,7 @@ multi_thread = ["dep:rayon", "dep:num_cpus"]
 
 [dependencies]
 num-traits = "0.2.0"
-ndarray = ">=0.15,<=0.16"
+ndarray = ">=0.15, <=0.16"
 alga = { version = "0.9.0", optional = true }
 num-complex = "0.4.0"
 serde = { version = "1.0.0", optional = true, features = ["derive"] }