diff --git a/libconfig/Cargo.toml b/libconfig/Cargo.toml
index 43ea995..ccd80e6 100644
--- a/libconfig/Cargo.toml
+++ b/libconfig/Cargo.toml
@@ -6,8 +6,7 @@ edition = "2018"
 
 [dependencies]
 libboard_zynq = { path = "../libboard_zynq" }
-core_io = { version = "0.1", features = ["collections"] }
-fatfs = { version = "0.3", features = ["core_io"], default-features = false }
+fatfs = { default-features = false, optional = true, git = "https://github.com/rafalh/rust-fatfs" }
 log = "0.4"
 
 [features]
@@ -16,4 +15,4 @@ target_coraz7 = []
 target_redpitaya = []
 target_kasli_soc = []
 ipv6 = []
-fat_lfn = [ "fatfs/alloc" ]
\ No newline at end of file
+fat_lfn = [ "fatfs/alloc" ]
diff --git a/szl/Cargo.toml b/szl/Cargo.toml
index b1a33ae..28423dc 100644
--- a/szl/Cargo.toml
+++ b/szl/Cargo.toml
@@ -15,7 +15,6 @@ default = ["target_zc706"]
 [dependencies]
 log = "0.4"
 byteorder = { version = "1.3", default-features = false }
-core_io = { version = "0.1", features = ["collections"] }
 
 libboard_zynq = { path = "../libboard_zynq" }
 libsupport_zynq = { path = "../libsupport_zynq" }