diff --git a/fuzz_runner/Cargo.toml b/fuzz_runner/Cargo.toml
index afdfc29..23e8a52 100644
--- a/fuzz_runner/Cargo.toml
+++ b/fuzz_runner/Cargo.toml
@@ -7,12 +7,11 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-nix = "0.20.2"
+nix = "0.26.2"
 time = "0.2.9"
 subprocess = "0.2.4"
 libc = "0.2.68"
 quick-error = "*"
-tempfile = "3.1.0"
 rand = "0.7.3"
 serde_derive = "1.0"
 serde = "1.0"
diff --git a/fuzz_runner/src/lib.rs b/fuzz_runner/src/lib.rs
index 4577f5c..d2d6d37 100644
--- a/fuzz_runner/src/lib.rs
+++ b/fuzz_runner/src/lib.rs
@@ -3,7 +3,6 @@ extern crate glob;
 extern crate nix;
 extern crate serde_derive;
 extern crate snafu;
-extern crate tempfile;
 extern crate timeout_readwrite;
 extern crate config;
 
diff --git a/fuzz_runner/src/nyx/aux_buffer.rs b/fuzz_runner/src/nyx/aux_buffer.rs
index c51bcd2..fc6207f 100644
--- a/fuzz_runner/src/nyx/aux_buffer.rs
+++ b/fuzz_runner/src/nyx/aux_buffer.rs
@@ -1,5 +1,4 @@
 
-use core::ffi::c_void;
 use nix::sys::mman::*;
 use std::fs::File;
 use std::os::unix::io::IntoRawFd;
@@ -59,8 +58,10 @@ impl AuxBuffer {
         }
 
         let flags = MapFlags::MAP_SHARED;
+        let null_addr = std::num::NonZeroUsize::new(0);
+        let size = std::num::NonZeroUsize::new(AUX_BUFFER_SIZE).unwrap();
         unsafe {
-            let ptr = mmap(0 as *mut c_void, 0x1000, prot, flags, file.into_raw_fd(), 0).unwrap();
+            let ptr = mmap(null_addr, size, prot, flags, file.into_raw_fd(), 0).unwrap();
             let header = (ptr.add(HEADER_OFFSET) as *mut auxilary_buffer_header_s)
                 .as_mut()
                 .unwrap();
diff --git a/fuzz_runner/src/nyx/qemu_process.rs b/fuzz_runner/src/nyx/qemu_process.rs
index d062d87..5dcb2e0 100644
--- a/fuzz_runner/src/nyx/qemu_process.rs
+++ b/fuzz_runner/src/nyx/qemu_process.rs
@@ -1,4 +1,3 @@
-use core::ffi::c_void;
 use std::os::unix::prelude::FromRawFd;
 use std::path::PathBuf;
 use nix::sys::mman::*;
@@ -75,8 +74,10 @@ fn run_qemu(ctrl: &mut UnixStream) -> io::Result<()>{
 fn make_shared_data(file: &File, size: usize) -> &'static mut [u8] {
     let prot = ProtFlags::PROT_READ | ProtFlags::PROT_WRITE;
     let flags = MapFlags::MAP_SHARED;
+    let null_addr = std::num::NonZeroUsize::new(0);
+    let wrapped_size = std::num::NonZeroUsize::new(size).unwrap();
     unsafe {
-        let ptr = mmap(0 as *mut c_void, size, prot, flags, file.as_raw_fd(), 0).unwrap();
+        let ptr = mmap(null_addr, wrapped_size, prot, flags, file.as_raw_fd(), 0).unwrap();
 
         let data = std::slice::from_raw_parts_mut(ptr as *mut u8, size);
         return data;
@@ -86,8 +87,10 @@ fn make_shared_data(file: &File, size: usize) -> &'static mut [u8] {
 fn make_shared_ijon_data(file: File, size: usize) -> FeedbackBuffer {
     let prot = ProtFlags::PROT_READ | ProtFlags::PROT_WRITE;
     let flags = MapFlags::MAP_SHARED;
+    let null_addr = std::num::NonZeroUsize::new(0);
+    let wrapped_size = std::num::NonZeroUsize::new(size).unwrap();
     unsafe {
-        let ptr = mmap(std::ptr::null_mut::<c_void>(), size, prot, flags, file.into_raw_fd(), 0).unwrap();
+        let ptr = mmap(null_addr, wrapped_size, prot, flags, file.into_raw_fd(), 0).unwrap();
         FeedbackBuffer::new((ptr as *mut SharedFeedbackData).as_mut().unwrap())
     }
 }
diff --git a/libnyx/Cargo.toml b/libnyx/Cargo.toml
index cb0dac6..3cb4a47 100644
--- a/libnyx/Cargo.toml
+++ b/libnyx/Cargo.toml
@@ -8,7 +8,7 @@ name = "libnyx"
 crate-type = ["staticlib", "dylib"]
 
 [build-dependencies]
-cbindgen = "0.19"
+cbindgen = "0.24.3"
 
 [dependencies]
 config={path="../config"}