diff --git a/Cargo.lock b/Cargo.lock
index 07be021..c04f40c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -63,7 +63,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "float4"
 version = "0.1.0"
 dependencies = [
- "simd 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "simd 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -196,7 +196,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "simd"
-version = "0.2.0"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -280,7 +280,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum redox_syscall 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)" = "3041aeb6000db123d2c9c751433f526e1f404b23213bd733167ab770c3989b4d"
 "checksum rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)" = "dcf128d1287d2ea9d80910b5f1120d0b8eede3fbf1abe91c40d39ea7d51e6fda"
 "checksum scoped_threadpool 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "3ef399c8893e8cb7aa9696e895427fab3a6bf265977bb96e126f24ddd2cda85a"
-"checksum simd 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7a94d14a2ae1f1f110937de5fb69e494372560181c7e1739a097fcc2cee37ba0"
+"checksum simd 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "3dd0805c7363ab51a829a1511ad24b6ed0349feaa756c4bc2f977f9f496e6673"
 "checksum strsim 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b4d15c810519a91cf877e7e36e63fe068815c678181439f2f29e2562147c3694"
 "checksum term_size 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e2b6b55df3198cc93372e85dd2ed817f0e38ce8cc0f22eb32391bfad9c4bf209"
 "checksum time 0.1.37 (registry+https://github.com/rust-lang/crates.io-index)" = "ffd7ccbf969a892bf83f1e441126968a07a3941c24ff522a26af9f9f4585d1a3"
diff --git a/sub_crates/float4/Cargo.toml b/sub_crates/float4/Cargo.toml
index 38f1264..e2efc1c 100644
--- a/sub_crates/float4/Cargo.toml
+++ b/sub_crates/float4/Cargo.toml
@@ -13,4 +13,4 @@ simd_perf = ["simd"]
 
 [dependencies]
 # Crates.io dependencies
-simd = { version = "0.2.0", optional = true }
\ No newline at end of file
+simd = { version = "0.2.1", optional = true }
\ No newline at end of file
diff --git a/sub_crates/float4/src/lib.rs b/sub_crates/float4/src/lib.rs
index 35b1df0..8358d82 100644
--- a/sub_crates/float4/src/lib.rs
+++ b/sub_crates/float4/src/lib.rs
@@ -263,7 +263,7 @@ impl Float4 {
         );
         #[cfg(feature = "simd_perf")]
         {
-            self.data = self.data.replace(n, v);
+            self.data = self.data.replace(n as u32, v);
         }
         #[cfg(not(feature = "simd_perf"))]
         unsafe {
@@ -304,7 +304,7 @@ impl Float4 {
         );
         #[cfg(feature = "simd_perf")]
         {
-            self.data.extract(n)
+            self.data.extract(n as u32)
         }
         #[cfg(not(feature = "simd_perf"))]
         unsafe { *self.data.get_unchecked(n) }
@@ -569,7 +569,7 @@ impl Bool4 {
         );
         #[cfg(feature = "simd_perf")]
         {
-            self.data.extract(n)
+            self.data.extract(n as u32)
         }
         #[cfg(not(feature = "simd_perf"))]
         {