diff --git a/Cargo.toml b/Cargo.toml
index 15902eef642a795c2e76ddc22d54e0a16765765a..5f1e68510393469cb1371289729c829c99d8052f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -25,8 +25,11 @@ socket2 = { version = "0.3.12", optional = true }
 backtrace = "0.3"
 lazy_static = "1.4.0"
 
+# ffi
+
 # socket ffi
-atomic_refcell = { version = "0.1.6", optional = true }
+libc = { version = "^0.2", optional = true }
+os_socketaddr = { verion = "0.1.0", optional = true }
 
 [dev-dependencies]
 # test-generator = "0.3.0"
@@ -38,8 +41,8 @@ lazy_static = "1.4.0"
 crate-type = ["cdylib"]
 
 [features]
-default = ["ffi", "ffi_socket_api"] # // "session_optimization", 
-ffi = [] # see src/ffi.rs
-ffi_socket_api = ["ffi", "atomic_refcell", "socket2"]
+default = ["ffi", "session_optimization"]
+ffi = [] # see src/ffi/mod.rs
+ffi_pseudo_socket_api = ["ffi", "libc", "os_socketaddr"]# see src/ffi/pseudo_socket_api.rs
 endpoint_logging = [] # see src/macros.rs
 session_optimization = [] # see src/runtime/setup.rs
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