diff --git a/Cargo.toml b/Cargo.toml
index 33a78673..f6569ae5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -31,17 +31,14 @@ generic-array  = "0.11"
 rand           = { version = "0.5", default-features = false }
 num-traits     = { version = "0.2", default-features = false }
 num-complex    = { version = "0.2", default-features = false }
-approx         = { version = "0.2", default-features = false }
-alga           = { version = "0.6", default-features = false }
+approx         = { version = "0.3", default-features = false }
+alga           = { version = "0.7", default-features = false }
 matrixmultiply = { version = "0.1", optional = true }
 serde          = { version = "1.0", optional = true }
 serde_derive   = { version = "1.0", optional = true }
-abomonation    = { version = "0.4", optional = true }
+abomonation    = { version = "0.5", optional = true }
 mint           = { version = "0.5", optional = true }
-
-[dependencies.quickcheck]
-optional = true
-version  = "0.4"
+quickcheck     = { version = "0.6", optional = true }
 
 [dev-dependencies]
 serde_json = "1.0"
diff --git a/nalgebra-lapack/Cargo.toml b/nalgebra-lapack/Cargo.toml
index 5a5c4664..3b9fd5f6 100644
--- a/nalgebra-lapack/Cargo.toml
+++ b/nalgebra-lapack/Cargo.toml
@@ -25,15 +25,15 @@ intel-mkl  = ["lapack-src/intel-mkl"]
 nalgebra      = { version = "0.15", path = ".." }
 num-traits    = "0.2"
 num-complex   = { version = "0.2", default-features = false }
-alga          = { version = "0.6", default-features = false }
+alga          = { version = "0.7", default-features = false }
 serde         = { version = "1.0", optional = true }
 serde_derive  = { version = "1.0", optional = true }
 lapack        = { version = "0.16", default-features = false }
-lapack-src    = { version = "0.1", default-features = false }
+lapack-src    = { version = "0.2", default-features = false }
 # clippy = "*"
 
 [dev-dependencies]
 nalgebra   = { version = "0.15", path = "..", features = [ "arbitrary" ] }
 quickcheck = "0.4"
-approx     = "0.2"
+approx     = "0.3"
 rand       = "0.5"
diff --git a/src/geometry/quaternion_construction.rs b/src/geometry/quaternion_construction.rs
index c492705f..e5f9b19f 100644
--- a/src/geometry/quaternion_construction.rs
+++ b/src/geometry/quaternion_construction.rs
@@ -6,14 +6,16 @@ use base::storage::Owned;
 use quickcheck::{Arbitrary, Gen};
 
 use num::{One, Zero};
-use rand::distributions::{Distribution, Standard, OpenClosed01};
+use rand::distributions::{Distribution, OpenClosed01, Standard};
 use rand::Rng;
 
 use alga::general::Real;
 
 use base::dimension::U3;
 use base::storage::Storage;
-use base::{Unit, Vector, Vector3, Vector4};
+#[cfg(feature = "arbitrary")]
+use base::Vector3;
+use base::{Unit, Vector, Vector4};
 
 use geometry::{Quaternion, Rotation, UnitQuaternion};