diff --git a/Cargo.toml b/Cargo.toml
index 6fe1f10..787e8e6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,5 +14,5 @@ rational, and complex types.
 """
 
 [dependencies]
-rustc-serialize = "0.2"
-rand = "0.1"
+rustc-serialize = "0.3.5"
+rand = "0.2.0"
diff --git a/benches/shootout-pidigits.rs b/benches/shootout-pidigits.rs
index ff87fee..122a9db 100644
--- a/benches/shootout-pidigits.rs
+++ b/benches/shootout-pidigits.rs
@@ -38,6 +38,9 @@
 // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 // OF THE POSSIBILITY OF SUCH DAMAGE.
 
+#![feature(core)]
+#![feature(test)]
+
 extern crate num;
 extern crate test;
 
@@ -124,9 +127,9 @@ fn use_bencher(b: &mut Bencher) {
     b.iter(|| pidigits(DEFAULT_DIGITS))
 }
 
+#[allow(dead_code)]
 fn main() {
-    let args = std::os::args();
-    let args = args.as_slice();
+    let args = std::env::args().collect::<Vec<_>>();
     let n = if args.len() < 2 {
         DEFAULT_DIGITS
     } else {
diff --git a/src/bigint.rs b/src/bigint.rs
index 7f92a57..366cbaa 100644
--- a/src/bigint.rs
+++ b/src/bigint.rs
@@ -2300,7 +2300,7 @@ mod biguint_tests {
     }
 
     #[test]
-    #[should_fail]
+    #[should_panic]
     fn test_sub_fail_on_underflow() {
         let (a, b) : (BigUint, BigUint) = (Zero::zero(), One::one());
         a - b;
@@ -2686,14 +2686,14 @@ mod biguint_tests {
     }
 
     #[test]
-    #[should_fail]
+    #[should_panic]
     fn test_zero_rand_range() {
         thread_rng().gen_biguint_range(&FromPrimitive::from_usize(54).unwrap(),
                                      &FromPrimitive::from_usize(54).unwrap());
     }
 
     #[test]
-    #[should_fail]
+    #[should_panic]
     fn test_negative_rand_range() {
         let mut rng = thread_rng();
         let l = FromPrimitive::from_usize(2352).unwrap();
@@ -3351,14 +3351,14 @@ mod bigint_tests {
     }
 
     #[test]
-    #[should_fail]
+    #[should_panic]
     fn test_zero_rand_range() {
         thread_rng().gen_bigint_range(&FromPrimitive::from_isize(54).unwrap(),
                                     &FromPrimitive::from_isize(54).unwrap());
     }
 
     #[test]
-    #[should_fail]
+    #[should_panic]
     fn test_negative_rand_range() {
         let mut rng = thread_rng();
         let l = FromPrimitive::from_usize(2352).unwrap();
diff --git a/src/complex.rs b/src/complex.rs
index ee0c6cd..9b23952 100644
--- a/src/complex.rs
+++ b/src/complex.rs
@@ -324,7 +324,7 @@ mod test {
     }
 
     #[test]
-    #[should_fail]
+    #[should_panic]
     fn test_divide_by_zero_natural() {
         let n = Complex::new(2, 3);
         let d = Complex::new(0, 0);
@@ -332,7 +332,7 @@ mod test {
     }
 
     #[test]
-    #[should_fail]
+    #[should_panic]
     #[ignore]
     fn test_inv_zero() {
         // FIXME #5736: should this really fail, or just NaN?
diff --git a/src/rational.rs b/src/rational.rs
index 9dcbaca..85f1484 100644
--- a/src/rational.rs
+++ b/src/rational.rs
@@ -519,7 +519,7 @@ mod test {
         assert_eq!(one22, One::one());
     }
     #[test]
-    #[should_fail]
+    #[should_panic]
     fn test_new_zero() {
         let _a = Ratio::new(1,0);
     }
@@ -674,7 +674,7 @@ mod test {
             assert_eq!(_0 - _0, _0);
         }
         #[test]
-        #[should_fail]
+        #[should_panic]
         fn test_div_0() {
             let _a =  _1 / _0;
         }