diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index acbfbcb..2a98585 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -30,7 +30,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
         # Do not forget to bump every 6 months!
-        gover: ["1.18"]
+        gover: ["1.19"]
     env:
       PYTHONDONTWRITEBYTECODE: x
     steps:
@@ -101,7 +101,7 @@ jobs:
         # Windows.
         os: [ubuntu-latest, macos-latest, windows-latest]
         # Do not forget to bump every 6 months!
-        gover: ["1.18"]
+        gover: ["1.19"]
     env:
       PYTHONDONTWRITEBYTECODE: x
     steps:
@@ -277,7 +277,10 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        gover: ['1.13.15']
+        # https://github.com/golang/go/issues/55078
+        # golang.org/x/sys/unix broke on Go versions before 1.17. Not worth
+        # fixing.
+        gover: ['1.17.13']
     env:
       PYTHONDONTWRITEBYTECODE: x
     steps:
@@ -301,7 +304,7 @@ jobs:
       matrix:
         os: [ubuntu-latest]
         # Do not forget to bump every 6 months!
-        gover: ["1.18"]
+        gover: ["1.19"]
     permissions:
       security-events: write
     steps:
diff --git a/doc.go b/doc.go
index 2af0df5..a79615f 100644
--- a/doc.go
+++ b/doc.go
@@ -9,11 +9,11 @@
 // includes registries to enable the application to discover the available
 // hardware.
 //
-// Concepts
+// # Concepts
 //
 // periph uses 3 layered concepts for interfacing:
 //
-//     Bus → Port → Conn
+//	Bus → Port → Conn
 //
 // Not every subpackage expose all 3 concepts. In fact, most packages don't.
 // For example, SPI doesn't expose Bus as the OSes generally only expose the
@@ -24,7 +24,7 @@
 // periph doesn't have yet a concept of star-like communication network, like
 // an IP network.
 //
-// Bus
+// # Bus
 //
 // A Bus is a multi-point communication channel where one "master" and multiple
 // "slaves" communicate together. In the case of periph, the Bus handle is
@@ -38,20 +38,20 @@
 // communication line (Chip Select (CS) line for SPI, address for I²C or
 // 1-wire) converts the Bus into a Port.
 //
-// Port
+// # Port
 //
 // A port is a point-to-point communication channel that is yet to be
 // initialized. It cannot be used for communication until it is connected and
 // transformed into a Conn. Configuring a Port converts it into a Conn. Not all
 // Port need configuration.
 //
-// Conn
+// # Conn
 //
 // A Conn is a fully configured half or full duplex communication channel that
 // is point-to-point, only between two devices. It is ready to use like any
 // readable and/or writable pipe.
 //
-// Subpackages
+// # Subpackages
 //
 // Most connection-type specific subpackages include subpackages:
 //
diff --git a/go.mod b/go.mod
index 8fbe1e4..392bfe9 100644
--- a/go.mod
+++ b/go.mod
@@ -4,9 +4,9 @@
 
 module periph.io/x/conn/v3
 
-go 1.13
+go 1.17
 
 // Warning: do not add any external dependencies here unless absolutely necessary.
 // This package should primarily depend on the standard library.
 
-require github.com/jonboulle/clockwork v0.2.2
+require github.com/jonboulle/clockwork v0.3.0
diff --git a/go.sum b/go.sum
index 76a9264..c27063d 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,2 @@
-github.com/jonboulle/clockwork v0.2.2 h1:UOGuzwb1PwsrDAObMuhUnj0p5ULPj8V/xJ7Kx9qUBdQ=
-github.com/jonboulle/clockwork v0.2.2/go.mod h1:Pkfl5aHPm1nk2H9h0bjmnJD/BcgbGXUBGnn1kMkgxc8=
+github.com/jonboulle/clockwork v0.3.0 h1:9BSCMi8C+0qdApAp4auwX0RkLGUjs956h0EkuQymUhg=
+github.com/jonboulle/clockwork v0.3.0/go.mod h1:Pkfl5aHPm1nk2H9h0bjmnJD/BcgbGXUBGnn1kMkgxc8=
diff --git a/gpio/gpiostream/gpiostream.go b/gpio/gpiostream/gpiostream.go
index 18e77f9..7075d05 100644
--- a/gpio/gpiostream/gpiostream.go
+++ b/gpio/gpiostream/gpiostream.go
@@ -4,7 +4,7 @@
 
 // Package gpiostream defines digital streams.
 //
-// Warning
+// # Warning
 //
 // This package is still in flux as development is on-going.
 package gpiostream
@@ -159,7 +159,7 @@ func (p *Program) Duration() time.Duration {
 
 // PinIn allows to read a bit stream from a pin.
 //
-// Caveat
+// # Caveat
 //
 // This interface doesn't enable sampling multiple pins in a
 // synchronized way or reading in a continuous uninterrupted way. As such, it
@@ -179,7 +179,7 @@ type PinIn interface {
 // Program that is an infinite loop, a separate goroutine can be used to cancel
 // the program. In this case StreamOut() returns without an error.
 //
-// Caveat
+// # Caveat
 //
 // This interface doesn't enable streaming to multiple pins in a
 // synchronized way or reading in a continuous uninterrupted way. As such, it
diff --git a/gpio/gpiotest/gpiotest_test.go b/gpio/gpiotest/gpiotest_test.go
index 97f857d..dd90d22 100644
--- a/gpio/gpiotest/gpiotest_test.go
+++ b/gpio/gpiotest/gpiotest_test.go
@@ -6,7 +6,7 @@ package gpiotest
 
 import (
 	"flag"
-	"io/ioutil"
+	"io"
 	"log"
 	"os"
 	"reflect"
@@ -204,7 +204,7 @@ func init() {
 func TestMain(m *testing.M) {
 	flag.Parse()
 	if !testing.Verbose() {
-		log.SetOutput(ioutil.Discard)
+		log.SetOutput(io.Discard)
 	}
 	os.Exit(m.Run())
 }
diff --git a/mmr/mmr.go b/mmr/mmr.go
index 882e299..85d7fa1 100644
--- a/mmr/mmr.go
+++ b/mmr/mmr.go
@@ -6,8 +6,8 @@
 // Mapped Registers protocol.
 //
 // The protocol is defined two supported commands:
-//  - Write Address, Read Value
-//  - Write Address, Write Value
+//   - Write Address, Read Value
+//   - Write Address, Write Value
 package mmr
 
 import (
diff --git a/onewire/onewire.go b/onewire/onewire.go
index c3a2ee4..324f0e7 100644
--- a/onewire/onewire.go
+++ b/onewire/onewire.go
@@ -17,7 +17,7 @@
 //
 // See https://en.wikipedia.org/wiki/1-Wire for more information.
 //
-// References
+// # References
 //
 // Overview: https://www.maximintegrated.com/en/app-notes/index.mvp/id/1796
 //
diff --git a/onewire/onewiretest/onewiretest.go b/onewire/onewiretest/onewiretest.go
index 32077af..5a49d0d 100644
--- a/onewire/onewiretest/onewiretest.go
+++ b/onewire/onewiretest/onewiretest.go
@@ -190,7 +190,6 @@ func (p *Playback) SearchTriplet(direction byte) (onewire.TripletResult, error)
 	return tr, nil
 }
 
-//
 // errorf is the internal implementation that optionally panic.
 //
 // If dontPanic is false, it panics instead.
diff --git a/physic/doc.go b/physic/doc.go
index 026e2dd..ac03549 100644
--- a/physic/doc.go
+++ b/physic/doc.go
@@ -7,15 +7,16 @@
 //
 // This includes temperature, humidity, pressure, tension, current, etc.
 //
-// SI units
+// # SI units
 //
 // The supported S.I. units is a subset of the official ones.
-//    T  	tera 	10¹²  	1000000000000
-//    G  	giga 	10⁹   	1000000000
-//    M  	mega 	10⁶   	1000000
-//    k  	kilo 	10³   	1000
-//    m  	milli	10⁻³  	0.001
-//    µ,u	micro	10⁻⁶  	0.000001
-//    n  	nano 	10⁻⁹  	0.000000001
-//    p  	pico 	10⁻¹² 	0.000000000001
+//
+//	T  	tera 	10¹²  	1000000000000
+//	G  	giga 	10⁹   	1000000000
+//	M  	mega 	10⁶   	1000000
+//	k  	kilo 	10³   	1000
+//	m  	milli	10⁻³  	0.001
+//	µ,u	micro	10⁻⁶  	0.000001
+//	n  	nano 	10⁻⁹  	0.000000001
+//	p  	pico 	10⁻¹² 	0.000000000001
 package physic
diff --git a/spi/spi.go b/spi/spi.go
index 724da06..02bb491 100644
--- a/spi/spi.go
+++ b/spi/spi.go
@@ -34,7 +34,6 @@ import (
 //
 // The bits can be OR'ed to change the parameters used for
 // communication.
-//
 type Mode int
 
 // Mode determines the SPI communication parameters.
diff --git a/spi/spitest/spitest_test.go b/spi/spitest/spitest_test.go
index ec40d2e..c5e60cd 100644
--- a/spi/spitest/spitest_test.go
+++ b/spi/spitest/spitest_test.go
@@ -8,7 +8,7 @@ import (
 	"bytes"
 	"errors"
 	"flag"
-	"io/ioutil"
+	"io"
 	"log"
 	"os"
 	"testing"
@@ -339,7 +339,7 @@ func TestLog_Playback(t *testing.T) {
 func TestMain(m *testing.M) {
 	flag.Parse()
 	if !testing.Verbose() {
-		log.SetOutput(ioutil.Discard)
+		log.SetOutput(io.Discard)
 	}
 	os.Exit(m.Run())
 }