diff --git a/artiq/firmware/Cargo.lock b/artiq/firmware/Cargo.lock
index 6a04d73c2..9f6e3a821 100644
--- a/artiq/firmware/Cargo.lock
+++ b/artiq/firmware/Cargo.lock
@@ -41,7 +41,7 @@ dependencies = [
  "board 0.0.0",
  "build_artiq 0.0.0",
  "build_misoc 0.0.0",
- "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -81,6 +81,11 @@ name = "cc"
 version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "cfg-if"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "compiler_builtins"
 version = "0.1.0"
@@ -107,7 +112,7 @@ dependencies = [
  "build_misoc 0.0.0",
  "byteorder 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "crc 1.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "std_artiq 0.0.0",
 ]
 
@@ -157,6 +162,14 @@ name = "log"
 version = "0.3.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "log"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "log_buffer"
 version = "1.1.0"
@@ -167,7 +180,7 @@ name = "logger_artiq"
 version = "0.0.0"
 dependencies = [
  "board 0.0.0",
- "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "log_buffer 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -183,7 +196,7 @@ dependencies = [
  "byteorder 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "cslice 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "dyld 0.0.0",
- "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "std_artiq 0.0.0",
 ]
 
@@ -202,7 +215,7 @@ dependencies = [
  "cslice 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "drtioaux 0.0.0",
  "fringe 1.1.0 (git+https://github.com/m-labs/libfringe?rev=bd23494)",
- "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "logger_artiq 0.0.0",
  "proto 0.0.0",
  "smoltcp 0.4.0 (git+https://github.com/m-labs/smoltcp?rev=507d2fe)",
@@ -228,7 +241,7 @@ dependencies = [
  "build_artiq 0.0.0",
  "build_misoc 0.0.0",
  "drtioaux 0.0.0",
- "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "logger_artiq 0.0.0",
  "std_artiq 0.0.0",
 ]
@@ -272,6 +285,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum build_const 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e90dc84f5e62d2ebe7676b83c22d33b6db8bd27340fb6ffbff0a364efa0cb9c9"
 "checksum byteorder 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "652805b7e73fada9d85e9a6682a4abd490cb52d96aeecc12e33a0de34dfd0d23"
 "checksum cc 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a9b13a57efd6b30ecd6598ebdb302cca617930b5470647570468a65d12ef9719"
+"checksum cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "d4c819a1287eb618df47cc647173c5c4c66ba19d888a6e50d605672aed3140de"
 "checksum compiler_builtins 0.1.0 (git+https://github.com/m-labs/compiler-builtins?rev=1c765ad)" = "<none>"
 "checksum crc 1.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "bd5d02c0aac6bd68393ed69e00bbc2457f3e89075c6349db7189618dc4ddc1d7"
 "checksum cslice 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "0f8cb7306107e4b10e64994de6d3274bd08996a7c1322a27b86482392f96be0a"
@@ -279,6 +293,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
 "checksum libc 0.2.34 (registry+https://github.com/rust-lang/crates.io-index)" = "36fbc8a8929c632868295d0178dd8f63fc423fd7537ad0738372bd010b3ac9b0"
 "checksum log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)" = "880f77541efa6e5cc74e76910c9884d9859683118839d6a1dc3b11e63512565b"
+"checksum log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "89f010e843f2b1a31dbd316b3b8d443758bc634bed37aabade59c686d644e0a2"
 "checksum log_buffer 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ec57723b84bbe7bdf76aa93169c9b59e67473317c6de3a83cb2a0f8ccb2aa493"
 "checksum managed 0.4.0 (git+https://github.com/m-labs/rust-managed.git?rev=629a6786a1cf1692015f464ed16c04eafa5cb8d1)" = "<none>"
 "checksum same-file 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "d931a44fdaa43b8637009e7632a02adc4f2b2e0733c08caa4cf00e8da4a117a7"
diff --git a/artiq/firmware/libboard_artiq/Cargo.toml b/artiq/firmware/libboard_artiq/Cargo.toml
index 2c92b6050..d666b3ef0 100644
--- a/artiq/firmware/libboard_artiq/Cargo.toml
+++ b/artiq/firmware/libboard_artiq/Cargo.toml
@@ -14,7 +14,7 @@ build_artiq = { path = "../libbuild_artiq" }
 
 [dependencies]
 bitflags = "1.0"
-log = { version = "0.3", default-features = false }
+log = { version = "0.4", default-features = false }
 board = { path = "../libboard" }
 
 [features]
diff --git a/artiq/firmware/libdrtioaux/Cargo.toml b/artiq/firmware/libdrtioaux/Cargo.toml
index 515c15e29..6c4842148 100644
--- a/artiq/firmware/libdrtioaux/Cargo.toml
+++ b/artiq/firmware/libdrtioaux/Cargo.toml
@@ -12,7 +12,7 @@ path = "lib.rs"
 build_misoc = { path = "../libbuild_misoc" }
 
 [dependencies]
-log = { version = "0.3", default-features = false }
+log = { version = "0.4", default-features = false }
 crc = { version = "1.7", default-features = false }
 std_artiq = { path = "../libstd_artiq", features = ["alloc"] }
 board = { path = "../libboard" }
diff --git a/artiq/firmware/liblogger_artiq/Cargo.toml b/artiq/firmware/liblogger_artiq/Cargo.toml
index d9e6e2299..2cf792723 100644
--- a/artiq/firmware/liblogger_artiq/Cargo.toml
+++ b/artiq/firmware/liblogger_artiq/Cargo.toml
@@ -8,6 +8,6 @@ name = "logger_artiq"
 path = "lib.rs"
 
 [dependencies]
-log = { version = "0.3", default-features = false, features = [] }
+log = { version = "0.4", default-features = false }
 log_buffer = { version = "1.0" }
 board = { path = "../libboard" }
diff --git a/artiq/firmware/liblogger_artiq/lib.rs b/artiq/firmware/liblogger_artiq/lib.rs
index c51d45b7b..2d7dd531b 100644
--- a/artiq/firmware/liblogger_artiq/lib.rs
+++ b/artiq/firmware/liblogger_artiq/lib.rs
@@ -7,14 +7,13 @@ extern crate board;
 
 use core::cell::{Cell, RefCell};
 use core::fmt::Write;
-use log::{Log, LogMetadata, LogRecord, LogLevelFilter, MaxLogLevelFilter};
+use log::{Log, LevelFilter};
 use log_buffer::LogBuffer;
 use board::clock;
 
 pub struct BufferLogger {
     buffer:      RefCell<LogBuffer<&'static mut [u8]>>,
-    filter:      RefCell<Option<MaxLogLevelFilter>>,
-    uart_filter: Cell<LogLevelFilter>
+    uart_filter: Cell<LevelFilter>
 }
 
 static mut LOGGER: *const BufferLogger = 0 as *const _;
@@ -23,28 +22,18 @@ impl BufferLogger {
     pub fn new(buffer: &'static mut [u8]) -> BufferLogger {
         BufferLogger {
             buffer: RefCell::new(LogBuffer::new(buffer)),
-            filter: RefCell::new(None),
-            uart_filter: Cell::new(LogLevelFilter::Info),
+            uart_filter: Cell::new(LevelFilter::Info),
         }
     }
 
     pub fn register<F: FnOnce()>(&self, f: F) {
-        // log::set_logger_raw captures a pointer to ourselves, so we must prevent
-        // ourselves from being moved or dropped after that function is called (and
-        // before log::shutdown_logger_raw is called).
         unsafe {
-            log::set_logger_raw(|max_log_level| {
-                max_log_level.set(LogLevelFilter::Info);
-                *self.filter.borrow_mut() = Some(max_log_level);
-                self as *const Log
-            }).expect("global logger can only be initialized once");
             LOGGER = self;
+            log::set_logger(&*LOGGER)
+                .expect("global logger can only be initialized once");
         }
+        log::set_max_level(LevelFilter::Info);
         f();
-        log::shutdown_logger_raw().unwrap();
-        unsafe {
-            LOGGER = 0 as *const _;
-        }
     }
 
     pub fn with<R, F: FnOnce(&BufferLogger) -> R>(f: F) -> R {
@@ -60,34 +49,18 @@ impl BufferLogger {
     }
 
     pub fn extract<R, F: FnOnce(&str) -> R>(&self, f: F) -> R {
-        let old_log_level = self.max_log_level();
-        self.set_max_log_level(LogLevelFilter::Off);
+        let old_log_level = log::max_level();
+        log::set_max_level(LevelFilter::Off);
         let result = f(self.buffer.borrow_mut().extract());
-        self.set_max_log_level(old_log_level);
+        log::set_max_level(old_log_level);
         result
     }
 
-    pub fn max_log_level(&self) -> LogLevelFilter {
-        self.filter
-            .borrow()
-            .as_ref()
-            .expect("register the logger before touching maximum log level")
-            .get()
-    }
-
-    pub fn set_max_log_level(&self, max_level: LogLevelFilter) {
-        self.filter
-            .borrow()
-            .as_ref()
-            .expect("register the logger before touching maximum log level")
-            .set(max_level)
-    }
-
-    pub fn uart_log_level(&self) -> LogLevelFilter {
+    pub fn uart_log_level(&self) -> LevelFilter {
         self.uart_filter.get()
     }
 
-    pub fn set_uart_log_level(&self, max_level: LogLevelFilter) {
+    pub fn set_uart_log_level(&self, max_level: LevelFilter) {
         self.uart_filter.set(max_level)
     }
 }
@@ -96,11 +69,11 @@ impl BufferLogger {
 unsafe impl Sync for BufferLogger {}
 
 impl Log for BufferLogger {
-    fn enabled(&self, _metadata: &LogMetadata) -> bool {
+    fn enabled(&self, _metadata: &log::Metadata) -> bool {
         true
     }
 
-    fn log(&self, record: &LogRecord) {
+    fn log(&self, record: &log::Record) {
         if self.enabled(record.metadata()) {
             let timestamp = clock::get_us();
             let seconds   = timestamp / 1_000_000;
@@ -116,4 +89,7 @@ impl Log for BufferLogger {
             }
         }
     }
+
+    fn flush(&self) {
+    }
 }
diff --git a/artiq/firmware/libproto/Cargo.toml b/artiq/firmware/libproto/Cargo.toml
index 487ae483b..eb805f1eb 100644
--- a/artiq/firmware/libproto/Cargo.toml
+++ b/artiq/firmware/libproto/Cargo.toml
@@ -10,6 +10,6 @@ path = "lib.rs"
 [dependencies]
 byteorder = { version = "1.0", default-features = false }
 cslice = { version = "0.3" }
-log = { version = "0.3", default-features = false, optional = true }
+log = { version = "0.4", default-features = false, optional = true }
 std_artiq = { path = "../libstd_artiq", features = ["alloc"] }
 dyld = { path = "../libdyld" }
diff --git a/artiq/firmware/libproto/mgmt_proto.rs b/artiq/firmware/libproto/mgmt_proto.rs
index 123af8915..cb5e08856 100644
--- a/artiq/firmware/libproto/mgmt_proto.rs
+++ b/artiq/firmware/libproto/mgmt_proto.rs
@@ -2,7 +2,7 @@ use std::vec::Vec;
 use std::io::{self, Read, Write};
 use {ReadExt, WriteExt};
 #[cfg(feature = "log")]
-use log::LogLevelFilter;
+use log;
 
 #[derive(Debug)]
 pub enum Request {
@@ -10,9 +10,9 @@ pub enum Request {
     ClearLog,
     PullLog,
     #[cfg(feature = "log")]
-    SetLogFilter(LogLevelFilter),
+    SetLogFilter(log::LevelFilter),
     #[cfg(feature = "log")]
-    SetUartLogFilter(LogLevelFilter),
+    SetUartLogFilter(log::LevelFilter),
 
     Hotswap(Vec<u8>),
     Reboot,
@@ -29,14 +29,14 @@ pub enum Reply<'a> {
 impl Request {
     pub fn read_from(reader: &mut Read) -> io::Result<Request> {
         #[cfg(feature = "log")]
-        fn read_log_level_filter(reader: &mut Read) -> io::Result<LogLevelFilter> {
+        fn read_log_level_filter(reader: &mut Read) -> io::Result<log::LevelFilter> {
             Ok(match reader.read_u8()? {
-                0 => LogLevelFilter::Off,
-                1 => LogLevelFilter::Error,
-                2 => LogLevelFilter::Warn,
-                3 => LogLevelFilter::Info,
-                4 => LogLevelFilter::Debug,
-                5 => LogLevelFilter::Trace,
+                0 => log::LevelFilter::Off,
+                1 => log::LevelFilter::Error,
+                2 => log::LevelFilter::Warn,
+                3 => log::LevelFilter::Info,
+                4 => log::LevelFilter::Debug,
+                5 => log::LevelFilter::Trace,
                 _ => return Err(io::Error::new(io::ErrorKind::InvalidData,
                                                "invalid log level"))
             })
diff --git a/artiq/firmware/runtime/Cargo.toml b/artiq/firmware/runtime/Cargo.toml
index 7057814c1..59dd144c2 100644
--- a/artiq/firmware/runtime/Cargo.toml
+++ b/artiq/firmware/runtime/Cargo.toml
@@ -16,7 +16,7 @@ build_artiq = { path = "../libbuild_artiq" }
 [dependencies]
 byteorder = { version = "1.0", default-features = false }
 cslice = { version = "0.3" }
-log = { version = "0.3", default-features = false }
+log = { version = "0.4", default-features = false }
 board = { path = "../libboard", features = ["uart_console", "smoltcp"] }
 alloc_list = { path = "../liballoc_list" }
 std_artiq = { path = "../libstd_artiq", features = ["alloc", "io_error_alloc"] }
diff --git a/artiq/firmware/runtime/main.rs b/artiq/firmware/runtime/main.rs
index f8f996601..1d6e631f5 100644
--- a/artiq/firmware/runtime/main.rs
+++ b/artiq/firmware/runtime/main.rs
@@ -164,8 +164,7 @@ fn startup_ethernet() {
         Ok(Ok(log_level_filter)) => {
             info!("log level set to {} by `log_level` config key",
                   log_level_filter);
-            logger_artiq::BufferLogger::with(|logger|
-                logger.set_max_log_level(log_level_filter));
+            log::set_max_level(log_level_filter);
         }
         _ => info!("log level set to INFO by default")
     }
diff --git a/artiq/firmware/runtime/mgmt.rs b/artiq/firmware/runtime/mgmt.rs
index 2933102f5..ee3cbe5fb 100644
--- a/artiq/firmware/runtime/mgmt.rs
+++ b/artiq/firmware/runtime/mgmt.rs
@@ -1,6 +1,6 @@
 use board::boot;
 use std::io::{self, Read, Write};
-use log::LogLevelFilter;
+use log::{self, LevelFilter};
 use logger_artiq::BufferLogger;
 use sched::Io;
 use sched::{TcpListener, TcpStream};
@@ -44,11 +44,11 @@ fn worker(io: &Io, stream: &mut TcpStream) -> io::Result<()> {
                     io.until(|| BufferLogger::with(|logger| !logger.is_empty()))?;
 
                     BufferLogger::with(|logger| {
-                        let log_level = logger.max_log_level();
+                        let log_level = log::max_level();
                         logger.extract(|log| {
                             stream.write_string(log)?;
 
-                            if log_level == LogLevelFilter::Trace {
+                            if log_level == LevelFilter::Trace {
                                 // Hold exclusive access over the logger until we get positive
                                 // acknowledgement; otherwise we get an infinite loop of network
                                 // trace messages being transmitted and causing more network
@@ -69,8 +69,7 @@ fn worker(io: &Io, stream: &mut TcpStream) -> io::Result<()> {
 
             Request::SetLogFilter(level) => {
                 info!("changing log level to {}", level);
-                BufferLogger::with(|logger|
-                    logger.set_max_log_level(level));
+                log::set_max_level(level);
                 Reply::Success.write_to(stream)?;
             },
 
diff --git a/artiq/firmware/satman/Cargo.toml b/artiq/firmware/satman/Cargo.toml
index 8ca07b053..82db164f9 100644
--- a/artiq/firmware/satman/Cargo.toml
+++ b/artiq/firmware/satman/Cargo.toml
@@ -14,7 +14,7 @@ build_misoc = { path = "../libbuild_misoc" }
 build_artiq = { path = "../libbuild_artiq" }
 
 [dependencies]
-log = { version = "0.3", default-features = false }
+log = { version = "0.4", default-features = false }
 alloc_list = { path = "../liballoc_list" }
 board = { path = "../libboard", features = ["uart_console"] }
 board_artiq = { path = "../libboard_artiq" }