diff --git a/src/bls12_381/ec.rs b/src/bls12_381/ec.rs
index 675999167..6bebc246b 100644
--- a/src/bls12_381/ec.rs
+++ b/src/bls12_381/ec.rs
@@ -18,7 +18,7 @@ macro_rules! curve_impl {
         }
 
         impl ::std::fmt::Display for $affine {
-            fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
+            fn fmt(&self, f: &mut ::std::fmt::Formatter<'_>) -> ::std::fmt::Result {
                 if self.infinity {
                     write!(f, "{}(Infinity)", $name)
                 } else {
@@ -35,7 +35,7 @@ macro_rules! curve_impl {
         }
 
         impl ::std::fmt::Display for $projective {
-            fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
+            fn fmt(&self, f: &mut ::std::fmt::Formatter<'_>) -> ::std::fmt::Result {
                 write!(f, "{}", self.into_affine())
             }
         }
@@ -656,7 +656,7 @@ pub mod g1 {
     }
 
     impl fmt::Debug for G1Uncompressed {
-        fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+        fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
             self.0[..].fmt(formatter)
         }
     }
@@ -766,7 +766,7 @@ pub mod g1 {
     }
 
     impl fmt::Debug for G1Compressed {
-        fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+        fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
             self.0[..].fmt(formatter)
         }
     }
@@ -1325,7 +1325,7 @@ pub mod g2 {
     }
 
     impl fmt::Debug for G2Uncompressed {
-        fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+        fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
             self.0[..].fmt(formatter)
         }
     }
@@ -1451,7 +1451,7 @@ pub mod g2 {
     }
 
     impl fmt::Debug for G2Compressed {
-        fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+        fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
             self.0[..].fmt(formatter)
         }
     }
diff --git a/src/bls12_381/fq12.rs b/src/bls12_381/fq12.rs
index 097b6926c..0d6e066ef 100644
--- a/src/bls12_381/fq12.rs
+++ b/src/bls12_381/fq12.rs
@@ -12,7 +12,7 @@ pub struct Fq12 {
 }
 
 impl ::std::fmt::Display for Fq12 {
-    fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
+    fn fmt(&self, f: &mut ::std::fmt::Formatter<'_>) -> ::std::fmt::Result {
         write!(f, "Fq12({} + {} * w)", self.c0, self.c1)
     }
 }
diff --git a/src/bls12_381/fq2.rs b/src/bls12_381/fq2.rs
index 3587d7350..c115dd210 100644
--- a/src/bls12_381/fq2.rs
+++ b/src/bls12_381/fq2.rs
@@ -12,7 +12,7 @@ pub struct Fq2 {
 }
 
 impl ::std::fmt::Display for Fq2 {
-    fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
+    fn fmt(&self, f: &mut ::std::fmt::Formatter<'_>) -> ::std::fmt::Result {
         write!(f, "Fq2({} + {} * u)", self.c0, self.c1)
     }
 }
diff --git a/src/bls12_381/fq6.rs b/src/bls12_381/fq6.rs
index 0f434ff84..e2b49c992 100644
--- a/src/bls12_381/fq6.rs
+++ b/src/bls12_381/fq6.rs
@@ -12,7 +12,7 @@ pub struct Fq6 {
 }
 
 impl ::std::fmt::Display for Fq6 {
-    fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
+    fn fmt(&self, f: &mut ::std::fmt::Formatter<'_>) -> ::std::fmt::Result {
         write!(f, "Fq6({} + {} * v, {} * v^2)", self.c0, self.c1, self.c2)
     }
 }
diff --git a/src/lib.rs b/src/lib.rs
index 4e1110719..4c1f6b742 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -11,13 +11,12 @@
 // Force public structures to implement Debug
 #![deny(missing_debug_implementations)]
 
-extern crate byteorder;
-extern crate ff;
-extern crate group;
-extern crate rand_core;
 
-#[cfg(test)]
-extern crate rand_xorshift;
+
+
+
+
+
 
 #[cfg(test)]
 pub mod tests;