diff --git a/libconfig/Cargo.toml b/libconfig/Cargo.toml
index ab509ba..e1c7fa8 100644
--- a/libconfig/Cargo.toml
+++ b/libconfig/Cargo.toml
@@ -6,9 +6,8 @@ edition = "2021"
 
 [dependencies]
 libboard_zynq = { path = "../libboard_zynq" }
-<<<<<<< HEAD
-core_io = { version = "0.1", features = ["collections"] }
-fatfs = { version = "0.3", features = ["core_io"], default-features = false }
+core2 = { version = "=0.3.2", features = ["alloc", "nightly"], default-features = false }
+fatfs = { git = "https://github.com/SimonRenblad/rust-fatfs", branch = "stable-0.3", features = ["core2", "alloc"], default-features = false }
 log = "=0.4.14"
 
 [features]
@@ -17,4 +16,3 @@ target_coraz7 = []
 target_redpitaya = []
 target_kasli_soc = []
 ipv6 = []
-fat_lfn = [ "fatfs/alloc" ]
diff --git a/libconfig/src/bootgen.rs b/libconfig/src/bootgen.rs
index 884f22c..cb60716 100644
--- a/libconfig/src/bootgen.rs
+++ b/libconfig/src/bootgen.rs
@@ -1,5 +1,5 @@
 use alloc::vec::Vec;
-use core_io::{Error, Read, Seek, SeekFrom};
+use core2::io::{Error, Read, Seek, SeekFrom};
 use libboard_zynq::devc;
 use log::debug;
 
diff --git a/libconfig/src/lib.rs b/libconfig/src/lib.rs
index f1bf1b1..3cdf4cf 100644
--- a/libconfig/src/lib.rs
+++ b/libconfig/src/lib.rs
@@ -3,7 +3,7 @@ extern crate alloc;
 
 use core::fmt;
 use alloc::{string::FromUtf8Error, string::String, vec::Vec, rc::Rc};
-use core_io::{self as io, BufRead, BufReader, Read, Write, Seek, SeekFrom};
+use core2::io::{self as io, Read, Write, Seek, SeekFrom};
 use libboard_zynq::sdio;
 
 pub mod sd_reader;
@@ -54,11 +54,13 @@ impl<'a> From<FromUtf8Error> for Error<'a> {
 fn parse_config<'a>(
     key: &'a str,
     buffer: &mut Vec<u8>,
-    file: fatfs::File<sd_reader::SdReader>,
+    file: &mut fatfs::File<sd_reader::SdReader>,
 ) -> Result<'a, ()> {
     let prefix = [key, "="].concat().to_ascii_lowercase();
-    for line in BufReader::new(file).lines() {
-        let line = line?.to_ascii_lowercase();
+    let mut read_buf = Vec::new();
+    file.read_to_end(&mut read_buf)?;
+    for line in String::from_utf8(read_buf)?.lines() {
+        let line = line.to_ascii_lowercase();
         if line.starts_with(&prefix) {
             buffer.extend(line[prefix.len()..].as_bytes());
             return Ok(());
@@ -101,7 +103,7 @@ impl Config {
             match root_dir.open_file(&["/CONFIG/", key, ".BIN"].concat()) {
                 Ok(mut f) => f.read_to_end(&mut buffer).map(|_| ())?,
                 Err(_) => match root_dir.open_file("/CONFIG.TXT") {
-                    Ok(f) => parse_config(key, &mut buffer, f)?,
+                    Ok(mut f) => parse_config(key, &mut buffer, &mut f)?,
                     Err(_) => return Err(Error::KeyNotFoundError(key)),
                 },
             };
@@ -124,11 +126,11 @@ impl Config {
                     let prefix = [key, "="].concat().to_ascii_lowercase();
                     match root_dir.create_file("/CONFIG.TXT") {
                         Ok(mut f) => {
-                            let mut buffer = String::new();
-                            f.read_to_string(&mut buffer)?;
+                            let mut buffer = Vec::new();
+                            f.read_to_end(&mut buffer)?;
                             f.seek(SeekFrom::Start(0))?;
                             f.truncate()?;
-                            for line in buffer.lines() {
+                            for line in String::from_utf8(buffer)?.lines() {
                                 if line.len() > 0 && !line.to_ascii_lowercase().starts_with(&prefix) {
                                     f.write(line.as_bytes())?;
                                     f.write(NEWLINE)?;
diff --git a/libconfig/src/sd_reader.rs b/libconfig/src/sd_reader.rs
index 5254a07..655bc94 100644
--- a/libconfig/src/sd_reader.rs
+++ b/libconfig/src/sd_reader.rs
@@ -1,4 +1,4 @@
-use core_io::{BufRead, Error, ErrorKind, Read, Result as IoResult, Seek, SeekFrom, Write};
+use core2::io::{BufRead, Error, ErrorKind, Read, Result as IoResult, Seek, SeekFrom, Write};
 use fatfs;
 use libboard_zynq::sdio::{sd_card::SdCard, CmdTransferError};
 use log::debug;
diff --git a/szl/Cargo.toml b/szl/Cargo.toml
index 958ae3a..6b97e4f 100644
--- a/szl/Cargo.toml
+++ b/szl/Cargo.toml
@@ -13,9 +13,9 @@ target_kasli_soc = ["libboard_zynq/target_kasli_soc", "libsupport_zynq/target_ka
 default = ["target_zc706"]
 
 [dependencies]
-log = "0.4"
-byteorder = { version = "1.3", default-features = false }
-core_io = { version = "0.1", features = ["collections"] }
+log = "=0.4.14"
+byteorder = { version = "=1.3", default-features = false }
+core2 = { version = "=0.3.2", default-features = false, features = ["alloc", "nightly"] }
 
 libboard_zynq = { path = "../libboard_zynq" }
 libsupport_zynq = { path = "../libsupport_zynq" }
diff --git a/szl/src/main.rs b/szl/src/main.rs
index aafda8b..2729099 100644
--- a/szl/src/main.rs
+++ b/szl/src/main.rs
@@ -8,7 +8,7 @@ mod netboot;
 
 use alloc::rc::Rc;
 use core::mem;
-use core_io::{Read, Seek};
+use core2::io::{Read, Seek};
 use libboard_zynq::{
     self as zynq,
     clocks::source::{ArmPll, ClockSource, IoPll},
diff --git a/szl/src/netboot.rs b/szl/src/netboot.rs
index 8552a6e..ee91b62 100644
--- a/szl/src/netboot.rs
+++ b/szl/src/netboot.rs
@@ -1,7 +1,7 @@
 use alloc::vec;
 use alloc::vec::Vec;
 use byteorder::{ByteOrder, NetworkEndian};
-use core_io::{Read, Seek};
+use core2::io::{Read, Seek};
 use libboard_zynq::{
     devc,
     eth::Eth,