diff --git a/Cargo.toml b/Cargo.toml
index 6f919bd..f1b62c2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,7 @@
 [package]
 name = "janus-plugin"
 version = "0.11.1"
+edition = "2018"
 authors = ["Marshall Quander <marshall@quander.me>"]
 description = "Library for creating plugins for Janus, the WebRTC gateway."
 repository = "https://github.com/mozilla/janus-plugin-rs"
diff --git a/jansson-sys/Cargo.toml b/jansson-sys/Cargo.toml
index ca56ee1..b5d348d 100644
--- a/jansson-sys/Cargo.toml
+++ b/jansson-sys/Cargo.toml
@@ -1,10 +1,11 @@
 [package]
 name = "jansson-sys"
 version = "0.1.0"
+edition = "2018"
 authors = ["Marshall Quander <marshall@quander.me>"]
 description = "Native bindings for Jansson, the C JSON library."
 repository = "https://github.com/mozilla/janus-plugin-rs"
 license = "MPL-2.0"
 
 [dev-dependencies]
-cstr-macro = "0.1.0"
\ No newline at end of file
+cstr-macro = "0.1.0"
diff --git a/jansson-sys/src/lib.rs b/jansson-sys/src/lib.rs
index 5dc4dd4..cebd86e 100644
--- a/jansson-sys/src/lib.rs
+++ b/jansson-sys/src/lib.rs
@@ -131,8 +131,7 @@ pub unsafe fn json_decref(json: *mut json_t) {
 }
 
 #[cfg(test)]
-#[macro_use]
-extern crate cstr_macro;
+use cstr_macro::cstr;
 
 #[cfg(test)]
 mod tests {
diff --git a/janus-plugin-sys/Cargo.toml b/janus-plugin-sys/Cargo.toml
index d4f7f8e..db6417c 100644
--- a/janus-plugin-sys/Cargo.toml
+++ b/janus-plugin-sys/Cargo.toml
@@ -1,6 +1,7 @@
 [package]
 name = "janus-plugin-sys"
 version = "0.6.0"
+edition = "2018"
 authors = ["Marshall Quander <marshall@quander.me>"]
 description = "Native bindings to the Janus plugin API."
 repository = "https://github.com/mozilla/janus-plugin-rs"
diff --git a/janus-plugin-sys/src/lib.rs b/janus-plugin-sys/src/lib.rs
index f105aa4..e6c4fb1 100644
--- a/janus-plugin-sys/src/lib.rs
+++ b/janus-plugin-sys/src/lib.rs
@@ -1,8 +1,6 @@
 #![allow(non_camel_case_types)]
 #![deny(missing_debug_implementations)]
 
-extern crate glib_sys;
-extern crate jansson_sys;
 use std::os::raw::{c_char, c_int};
 
 pub mod plugin;
diff --git a/janus-plugin-sys/src/plugin.rs b/janus-plugin-sys/src/plugin.rs
index 55f3ba4..e654f38 100644
--- a/janus-plugin-sys/src/plugin.rs
+++ b/janus-plugin-sys/src/plugin.rs
@@ -34,7 +34,7 @@ pub struct janus_plugin_session {
     pub gateway_handle: *mut c_void,
     pub plugin_handle: *mut c_void,
     pub stopped: c_int,
-    pub ref_: ::janus_refcount,
+    pub ref_: crate::janus_refcount,
 }
 
 #[repr(C)]
diff --git a/janus-plugin-sys/src/rtcp.rs b/janus-plugin-sys/src/rtcp.rs
index a58a093..d54560e 100644
--- a/janus-plugin-sys/src/rtcp.rs
+++ b/janus-plugin-sys/src/rtcp.rs
@@ -1,6 +1,6 @@
 #![allow(non_camel_case_types)]
 
-use super::glib_sys::{gboolean, GSList};
+use glib_sys::{gboolean, GSList};
 use std::os::raw::{c_char, c_int, c_uint};
 
 extern "C" {
diff --git a/janus-plugin-sys/src/sdp.rs b/janus-plugin-sys/src/sdp.rs
index dda276d..3ebafa6 100644
--- a/janus-plugin-sys/src/sdp.rs
+++ b/janus-plugin-sys/src/sdp.rs
@@ -1,6 +1,6 @@
 #![allow(non_camel_case_types)]
 
-use super::glib_sys::{gboolean, GList};
+use glib_sys::{gboolean, GList};
 use std::os::raw::{c_char, c_int, c_long, c_short, c_ulong};
 
 pub type guint16 = c_short;
diff --git a/src/debug.rs b/src/debug.rs
index 560bbc7..6305415 100644
--- a/src/debug.rs
+++ b/src/debug.rs
@@ -1,11 +1,8 @@
 /// Utilities for writing messages to the Janus log.
-extern crate chrono;
-extern crate colored;
-
 pub use super::ffi::janus_log_level as JANUS_LOG_LEVEL;
-use self::chrono::{DateTime, Local};
-use self::colored::{Color, Colorize};
-use super::ffi;
+use chrono::{DateTime, Local};
+use colored::{Color, Colorize};
+use janus_plugin_sys as ffi;
 use std::ffi::CString;
 use std::fmt::Write;
 use std::fmt;
@@ -136,7 +133,7 @@ macro_rules! janus_dbg {
 mod tests {
 
     use super::*;
-    use super::chrono::TimeZone;
+    use chrono::TimeZone;
 
     fn fixed_clock(year: i32, month: u32, day: u32, hour: u32, min: u32, sec: u32) -> DateTime<Local> {
         Local.ymd(year, month, day).and_hms(hour, min, sec)
diff --git a/src/jansson.rs b/src/jansson.rs
index c6b349c..9f2f0d5 100644
--- a/src/jansson.rs
+++ b/src/jansson.rs
@@ -1,5 +1,4 @@
 /// Utilities to work with Jansson JSON values, which are exposed in the Janus plugin API.
-extern crate libc;
 
 use jansson_sys;
 use std::error::Error;
@@ -9,7 +8,8 @@ use std::mem::MaybeUninit;
 use std::ops::Deref;
 use std::slice;
 use std::str;
-use utils::LibcString;
+use crate::utils::LibcString;
+use bitflags::bitflags;
 
 /// A pointer to a raw Jansson value struct.
 pub type RawJanssonValue = jansson_sys::json_t;
diff --git a/src/lib.rs b/src/lib.rs
index ca872da..b2eb188 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,16 +1,11 @@
 #![deny(missing_debug_implementations)]
 
-#[macro_use]
-extern crate bitflags;
-extern crate jansson_sys;
-extern crate janus_plugin_sys as ffi;
-extern crate glib_sys as glib;
-extern crate libc;
-extern crate serde;
-
+use janus_plugin_sys as ffi;
+use glib_sys as glib;
+use bitflags::bitflags;
 pub use debug::LogLevel;
 pub use debug::log;
-pub use jansson::{JanssonDecodingFlags, JanssonEncodingFlags, JanssonValue, RawJanssonValue};
+pub use crate::jansson::{JanssonDecodingFlags, JanssonEncodingFlags, JanssonValue, RawJanssonValue};
 pub use session::SessionWrapper;
 pub use ffi::events::janus_eventhandler as EventHandler;
 pub use ffi::plugin::janus_callbacks as PluginCallbacks;
diff --git a/src/sdp.rs b/src/sdp.rs
index 8547172..b3a434d 100644
--- a/src/sdp.rs
+++ b/src/sdp.rs
@@ -1,10 +1,10 @@
 /// Utilities to write SDP offers and answers using Janus's SDP parsing machinery.
 
-use super::ffi;
-use super::glib;
-use super::libc;
-use super::serde::de::{self, Deserialize, Deserializer, Unexpected, Visitor};
-use super::serde::ser::{Serialize, Serializer};
+use janus_plugin_sys as ffi;
+use glib_sys as glib;
+use libc;
+use serde::de::{self, Deserialize, Deserializer, Unexpected, Visitor};
+use serde::ser::{Serialize, Serializer};
 pub use ffi::sdp::janus_sdp_generate_answer as generate_answer;
 pub use ffi::sdp::janus_sdp_generate_offer as generate_offer;
 use std::collections::HashMap;
@@ -13,7 +13,7 @@ use std::fmt;
 use std::ffi::{CStr, CString};
 use std::ops::Deref;
 use std::str;
-use utils::GLibString;
+use crate::utils::GLibString;
 
 pub type RawSdp = ffi::sdp::janus_sdp;
 pub type RawMLine = ffi::sdp::janus_sdp_mline;
diff --git a/src/utils.rs b/src/utils.rs
index 82746cd..7a09c00 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -1,8 +1,8 @@
 /// Wrapper types and helpers for working with the Janus FFI layer.
 
-use super::glib;
-use super::libc;
-use super::serde::ser::{self, Serialize, Serializer};
+use glib_sys as glib;
+use libc;
+use serde::ser::{self, Serialize, Serializer};
 use std::error::Error;
 use std::ffi::CStr;
 use std::ops::Deref;