diff --git a/Cargo.toml b/Cargo.toml
index 7206592..c70aa5e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,15 +22,15 @@ name = "algebraics"
 crate-type = ["rlib", "cdylib"]
 
 [dependencies]
-num-traits = "0.2"
-num-bigint = "0.2"
-num-integer = "0.1"
-num-rational = "0.2"
-rand = "0.5"
-rand_pcg = "0.1.1"
-lazy_static = "1.4"
+num-traits = "0.2.14"
+num-bigint = "0.4.3"
+num-integer = "0.1.44"
+num-rational = "0.4.0"
+rand = "0.8.5"
+rand_pcg = "0.3.1"
+lazy_static = "1.4.0"
 
 [dependencies.pyo3]
-version = "0.9.0"
+version = "0.16.2"
 optional = true
 features = ["num-bigint"]
diff --git a/src/traits.rs b/src/traits.rs
index 82390d1..5d7d263 100644
--- a/src/traits.rs
+++ b/src/traits.rs
@@ -5,6 +5,7 @@ use num_bigint::{BigInt, BigUint};
 use num_integer::Integer;
 use num_rational::Ratio;
 use num_traits::{CheckedDiv, CheckedMul, CheckedRem, NumAssign, One, Signed, ToPrimitive, Zero};
+use std::convert::TryInto;
 use std::{
     fmt,
     ops::{Add, Div, DivAssign, Mul},
@@ -401,7 +402,7 @@ impl CeilLog2 for BigUint {
         if self.is_zero() {
             None
         } else {
-            Some((self - 1u32).bits())
+            Some((self - 1u32).bits().try_into().unwrap())
         }
     }
 }
@@ -411,7 +412,7 @@ impl FloorLog2 for BigUint {
         if self.is_zero() {
             None
         } else {
-            Some(self.bits() - 1)
+            Some((self.bits() - 1).try_into().unwrap())
         }
     }
 }
@@ -445,7 +446,7 @@ impl TrailingZeros for BigUint {
 impl CeilLog2 for BigInt {
     fn ceil_log2(&self) -> Option<usize> {
         if self.is_positive() {
-            Some((self - 1u32).bits())
+            Some((self - 1u32).bits().try_into().unwrap())
         } else {
             None
         }
@@ -455,7 +456,7 @@ impl CeilLog2 for BigInt {
 impl FloorLog2 for BigInt {
     fn floor_log2(&self) -> Option<usize> {
         if self.is_positive() {
-            Some(self.bits() - 1)
+            Some((self.bits() - 1).try_into().unwrap())
         } else {
             None
         }