diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 6b59e6e..56ffc35 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -22,7 +22,7 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: [1.17.x, 1.18.x]
+        go-version: [1.18.x]
         os: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.os }}
     steps:
@@ -44,8 +44,8 @@ jobs:
       run: diff <(echo -n) <(gofmt -d .)
     - if: matrix.os == 'ubuntu-latest' && matrix.go-version == '1.18.x'
       run: go vet ./...
-    # TODO: bump to Go 1.18 once staticcheck supports it
-    - if: matrix.os == 'ubuntu-latest' && matrix.go-version == '1.17.x'
+    # TODO: reenable once staticcheck supports Go 1.18
+    - if: matrix.os == 'ubuntu-latest' && matrix.go-version == '1.18.x' && false
       uses: dominikh/staticcheck-action@v1
       with:
         version: "2021.1.2"
diff --git a/README.md b/README.md
index b3a5458..04e87b4 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 	go install mvdan.cc/garble@latest
 
-Obfuscate Go code by wrapping the Go toolchain. Requires Go 1.17 or later.
+Obfuscate Go code by wrapping the Go toolchain. Requires Go 1.18 or later.
 
 	garble build [build flags] [packages]
 
diff --git a/go.mod b/go.mod
index eab3ab5..e1fbeb6 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module mvdan.cc/garble
 
-go 1.17
+go 1.18
 
 require (
 	github.com/frankban/quicktest v1.14.2
diff --git a/go.sum b/go.sum
index 164c876..68f903e 100644
--- a/go.sum
+++ b/go.sum
@@ -15,33 +15,11 @@ github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e/go.mod h1:pJLUxLENpZxwdsK
 github.com/rogpeppe/go-internal v1.6.1/go.mod h1:xXDCJY+GAPziupqXw64V24skbSoqbTEfhy4qGm1nDQc=
 github.com/rogpeppe/go-internal v1.8.1 h1:geMPLpDpQOgVyCg5z5GoRwLHepNdb71NXb67XFkP+Eg=
 github.com/rogpeppe/go-internal v1.8.1/go.mod h1:JeRgkft04UBgHMgCIwADu4Pn6Mtm5d4nPKWu0nJ5d+o=
-github.com/yuin/goldmark v1.4.1/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
-golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
 golang.org/x/mod v0.6.0-dev.0.20220106191415-9b9b3d81d5e3 h1:kQgndtyPBW/JIYERgdxfwMYh3AVStj88WQTlNDi2a+o=
 golang.org/x/mod v0.6.0-dev.0.20220106191415-9b9b3d81d5e3/go.mod h1:3p9vT2HGsQu2K1YbXdKPJLVgG5VJdoTa1poYQBtP1AY=
-golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
-golang.org/x/net v0.0.0-20211015210444-4f30a5c0130f/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
-golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211019181941-9d821ace8654 h1:id054HUawV2/6IGm2IV8KZQjqtwAOo2CYlOToYqa0d0=
-golang.org/x/sys v0.0.0-20211019181941-9d821ace8654/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
-golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
-golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.1.10 h1:QjFRCZxdOhBJ/UNgnBZLbNV13DlbnK0quyivTnXJM20=
 golang.org/x/tools v0.1.10/go.mod h1:Uh6Zz+xoGYZom868N8YTex3t7RhtHDBrE8Gzo9bV56E=
-golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/main.go b/main.go
index d7f3cec..5033f3f 100644
--- a/main.go
+++ b/main.go
@@ -195,8 +195,9 @@ func (w *uniqueLineWriter) Write(p []byte) (n int, err error) {
 }
 
 // debugf is like log.Printf, but it is a no-op by default.
-// TODO(mvdan): remove once we use 1.18: https://github.com/golang/go/issues/47164
-func debugf(format string, args ...interface{}) {
+// TODO(mvdan): use our own debug logger instead of hijacking the global one,
+// and drop the "flagDebug" no-op check now that we require Go 1.18 or later.
+func debugf(format string, args ...any) {
 	if !flagDebug {
 		return
 	}
@@ -263,8 +264,8 @@ var toolchainVersionSemver string
 
 func goVersionOK() bool {
 	const (
-		minGoVersionSemver = "v1.17.0"
-		suggestedGoVersion = "1.17.x"
+		minGoVersionSemver = "v1.18.0"
+		suggestedGoVersion = "1.18.x"
 	)
 
 	// rxVersion looks for a version like "go1.2" or "go1.2.3"
@@ -497,10 +498,7 @@ This command wraps "go %s". Below is its help:
 	goArgs := []string{
 		command,
 		"-trimpath",
-	}
-	if semver.Compare(toolchainVersionSemver, "v1.18.0") >= 0 {
-		// TODO: remove the conditional once we drop support for 1.17
-		goArgs = append(goArgs, "-buildvcs=false")
+		"-buildvcs=false",
 	}
 
 	// Pass the garble flags down to each toolexec invocation.
diff --git a/position.go b/position.go
index 5cbd28b..c48e4c9 100644
--- a/position.go
+++ b/position.go
@@ -15,6 +15,8 @@ import (
 )
 
 func isDirective(text string) bool {
+	// TODO: can we remove the check for "// +build" now that we require Go 1.18
+	// or later? we should update the tests too.
 	return strings.HasPrefix(text, "//go:") || strings.HasPrefix(text, "// +build")
 }
 
diff --git a/runtime_strip.go b/runtime_strip.go
index e9a3215..66b02cb 100644
--- a/runtime_strip.go
+++ b/runtime_strip.go
@@ -128,8 +128,7 @@ func stripRuntime(filename string, file *ast.File) {
 			switch filename {
 			case "print.go":
 				// was used in hexdumpWords
-				x.Specs = removeImport(`"runtime/internal/sys"`, x.Specs) // Before Go 1.18.
-				x.Specs = removeImport(`"internal/goarch"`, x.Specs)      // Go 1.18.
+				x.Specs = removeImport(`"internal/goarch"`, x.Specs)
 			case "traceback.go":
 				// was used in traceback1
 				x.Specs = removeImport(`"runtime/internal/atomic"`, x.Specs)
diff --git a/shared.go b/shared.go
index c770f27..d3c3ab5 100644
--- a/shared.go
+++ b/shared.go
@@ -113,7 +113,7 @@ func writeFileExclusive(name string, data []byte) error {
 	return err
 }
 
-func writeGobExclusive(name string, val interface{}) error {
+func writeGobExclusive(name string, val any) error {
 	f, err := createExclusive(name)
 	if err != nil {
 		return err
diff --git a/testdata/scripts/asm.txt b/testdata/scripts/asm.txt
index 2e45dff..2768ec7 100644
--- a/testdata/scripts/asm.txt
+++ b/testdata/scripts/asm.txt
@@ -23,7 +23,7 @@ binsubstr main$exe 'privateAdd' 'PublicAdd'
 -- go.mod --
 module test/main
 
-go 1.17
+go 1.18
 -- main.go --
 package main
 
diff --git a/testdata/scripts/basic.txt b/testdata/scripts/basic.txt
index b291be7..cec5446 100644
--- a/testdata/scripts/basic.txt
+++ b/testdata/scripts/basic.txt
@@ -58,7 +58,7 @@ binsubstr main$exe 'garble_main.go' 'globalVar' 'globalFunc' $gofullversion
 -- go.mod --
 module test/mainfoo
 
-go 1.17
+go 1.18
 -- garble_main.go --
 package main
 
diff --git a/testdata/scripts/cgo.txt b/testdata/scripts/cgo.txt
index 58d334d..9cf290e 100644
--- a/testdata/scripts/cgo.txt
+++ b/testdata/scripts/cgo.txt
@@ -27,7 +27,7 @@ binsubstr main$exe 'privateAdd'
 -- go.mod --
 module test/main
 
-go 1.17
+go 1.18
 -- main.go --
 package main
 
diff --git a/testdata/scripts/crossbuild.txt b/testdata/scripts/crossbuild.txt
index b681856..27165cd 100644
--- a/testdata/scripts/crossbuild.txt
+++ b/testdata/scripts/crossbuild.txt
@@ -15,7 +15,7 @@ garble build
 -- go.mod --
 module test/main
 
-go 1.17
+go 1.18
 -- main.go --
 package main
 
diff --git a/testdata/scripts/debugdir.txt b/testdata/scripts/debugdir.txt
index 75e52f1..464178b 100644
--- a/testdata/scripts/debugdir.txt
+++ b/testdata/scripts/debugdir.txt
@@ -18,7 +18,7 @@ stderr 'test/main' # we force rebuilds with -debugdir
 -- go.mod --
 module test/main
 
-go 1.17
+go 1.18
 -- main.go --
 package main
 
diff --git a/testdata/scripts/embed.txt b/testdata/scripts/embed.txt
index 71450a3..962b4f5 100644
--- a/testdata/scripts/embed.txt
+++ b/testdata/scripts/embed.txt
@@ -14,7 +14,7 @@ cmp stdout main.stdout
 -- go.mod --
 module test/main
 
-go 1.17
+go 1.18
 
 -- main.go --
 package main
diff --git a/testdata/scripts/gogarble.txt b/testdata/scripts/gogarble.txt
index 26bee34..1ab96ab 100644
--- a/testdata/scripts/gogarble.txt
+++ b/testdata/scripts/gogarble.txt
@@ -50,7 +50,7 @@ bincmp out_rebuild out
 -- go.mod --
 module test/main
 
-go 1.17
+go 1.18
 -- standalone/main.go --
 package main
 
diff --git a/testdata/scripts/goversion.txt b/testdata/scripts/goversion.txt
index b60e0d3..9f3b764 100644
--- a/testdata/scripts/goversion.txt
+++ b/testdata/scripts/goversion.txt
@@ -7,18 +7,18 @@ env PATH=${WORK}/.bin${:}${PATH}
 # An empty go version.
 env TOOLCHAIN_GOVERSION=''
 ! garble build
-stderr 'Go version is too old; please upgrade to Go 1\.17\.x or a newer devel version'
+stderr 'Go version is too old; please upgrade to Go 1\.18\.x or a newer devel version'
 
 # We should error on a devel version that's too old.
 # Note that they lacked the "goN.M-" prefix.
 env TOOLCHAIN_GOVERSION='devel +afb5fca Sun Aug 07 00:00:00 2020 +0000'
 ! garble build
-stderr 'Go version is too old; please upgrade to Go 1\.17\.x or a newer devel version'
+stderr 'Go version is too old; please upgrade to Go 1\.18\.x or a newer devel version'
 
 # Another form of old version; with an old "goN.M-" prefix.
 env TOOLCHAIN_GOVERSION='devel go1.15-afb5fca Sun Aug 07 00:00:00 2020 +0000'
 ! garble build
-stderr 'Go version "devel go1\.15-.*2020.*" is too old; please upgrade to Go 1\.17\.x'
+stderr 'Go version "devel go1\.15-.*2020.*" is too old; please upgrade to Go 1\.18\.x'
 
 # A current devel version should be fine.
 # Note that we don't look at devel version timestamps.
@@ -30,7 +30,7 @@ stderr 'mocking the real build'
 # We should error on a stable version that's too old.
 env TOOLCHAIN_GOVERSION='go1.14'
 ! garble build
-stderr 'Go version "go1\.14" is too old; please upgrade to Go 1\.17\.x'
+stderr 'Go version "go1\.14" is too old; please upgrade to Go 1\.18\.x'
 ! stderr 'or a newer devel version'
 
 # We should accept a future stable version.
@@ -46,8 +46,8 @@ env TOOLCHAIN_GOVERSION='devel go1.18-somecustomversion'
 stderr 'mocking the real build'
 
 # The current toolchain may be older than the one that built garble.
-env GARBLE_TEST_GOVERSION='go1.18'
-env TOOLCHAIN_GOVERSION='go1.17.3'
+env GARBLE_TEST_GOVERSION='go1.19'
+env TOOLCHAIN_GOVERSION='go1.18.3'
 ! garble build
 stderr 'mocking the real build'
 
@@ -58,10 +58,10 @@ env TOOLCHAIN_GOVERSION='devel go1.19-6673d5d701 Sun Mar 20 16:05:03 2022 +0000'
 stderr 'mocking the real build'
 
 # The current toolchain must not be newer than the one that built garble.
-env GARBLE_TEST_GOVERSION='go1.17'
-env TOOLCHAIN_GOVERSION='go1.18.1'
+env GARBLE_TEST_GOVERSION='go1.18'
+env TOOLCHAIN_GOVERSION='go1.19.1'
 ! garble build
-stderr 'garble was built with "go1\.17" and is being used with "go1\.18\.1"; please rebuild garble with the newer version'
+stderr 'garble was built with "go1\.18" and is being used with "go1\.19\.1"; please rebuild garble with the newer version'
 
 # We'll error even if the difference is a minor (bugfix) level.
 # In practice it probably wouldn't matter, but in theory it could still lead to tricky bugs.
@@ -73,14 +73,14 @@ stderr 'garble was built with "go1\.18\.11" and is being used with "go1\.18\.14"
 # If garble builds itself and is then used, it won't know what version built it.
 # As a fallback, we drop the comparison against the toolchain's version.
 env GARBLE_TEST_GOVERSION='bogus version'
-env TOOLCHAIN_GOVERSION='go1.17.3'
+env TOOLCHAIN_GOVERSION='go1.18.3'
 ! garble build
 stderr 'mocking the real build'
 
 -- go.mod --
 module test/main
 
-go 1.17
+go 1.18
 -- main.go --
 package main
 
diff --git a/testdata/scripts/implement.txt b/testdata/scripts/implement.txt
index 45df43c..bc99902 100644
--- a/testdata/scripts/implement.txt
+++ b/testdata/scripts/implement.txt
@@ -16,7 +16,7 @@ cmp stdout main.stdout
 -- go.mod --
 module test/main
 
-go 1.17
+go 1.18
 -- main.go --
 package main
 
@@ -91,7 +91,7 @@ type Struct2 struct {
 package lib3
 
 type StructEmbed struct {
-	Baz interface{}
+	Baz any
 }
 -- main.stdout --
 String method for foo
diff --git a/testdata/scripts/imports.txt b/testdata/scripts/imports.txt
index 246ef84..6f29a6e 100644
--- a/testdata/scripts/imports.txt
+++ b/testdata/scripts/imports.txt
@@ -45,7 +45,7 @@ cmp stdout main.stdout
 -- go.mod --
 module test/main
 
-go 1.17
+go 1.18
 
 require (
 	gopkg.in/garbletest.v2 v2.999.0
@@ -93,7 +93,7 @@ func main() {
 	garbletest.Test()
 }
 
-func printfWithoutPackage(format string, v interface{}) {
+func printfWithoutPackage(format string, v any) {
 	fmt.Print(strings.Split(fmt.Sprintf(format, v), ".")[1])
 }
 -- notag_fail.go --
diff --git a/testdata/scripts/init.txt b/testdata/scripts/init.txt
index 1a15df7..0e7eda9 100644
--- a/testdata/scripts/init.txt
+++ b/testdata/scripts/init.txt
@@ -13,7 +13,7 @@ cmp stderr main.stderr
 -- go.mod --
 module test/main
 
-go 1.17
+go 1.18
 -- main.go --
 package main
 
diff --git a/testdata/scripts/ldflags.txt b/testdata/scripts/ldflags.txt
index 3b74286..3b717aa 100644
--- a/testdata/scripts/ldflags.txt
+++ b/testdata/scripts/ldflags.txt
@@ -31,7 +31,7 @@ binsubstr main$exe 'unexportedVersion' 'ExportedUnset' 'v1.22.33' 'garble_replac
 -- go.mod --
 module domain.test/main
 
-go 1.17
+go 1.18
 -- main.go --
 package main
 
diff --git a/testdata/scripts/linkname.txt b/testdata/scripts/linkname.txt
index a0b550f..cf5ec23 100644
--- a/testdata/scripts/linkname.txt
+++ b/testdata/scripts/linkname.txt
@@ -15,7 +15,7 @@ cmp stderr main.stderr
 -- go.mod --
 module test/main
 
-go 1.17
+go 1.18
 
 replace big.chungus/meme => ./big.chungus/meme
 
@@ -52,7 +52,7 @@ func byteIndex(s string, c byte) int
 
 // A linkname to an external non-obfuscated non-exported func.
 //go:linkname interfaceEqual os/exec.interfaceEqual
-func interfaceEqual(a, b interface{}) bool
+func interfaceEqual(a, b any) bool
 
 // A linkname to an external obfuscated func.
 //go:linkname obfuscatedFunc test/main/imported.ObfuscatedFuncImpl
@@ -99,7 +99,7 @@ func ByteIndex(s string, c byte) int
 -- big.chungus/meme/go.mod --
 module test/main
 
-go 1.17
+go 1.18
 
 -- big.chungus/meme/dante.go --
 package meme
diff --git a/testdata/scripts/literals.txt b/testdata/scripts/literals.txt
index f069e00..064b2e8 100644
--- a/testdata/scripts/literals.txt
+++ b/testdata/scripts/literals.txt
@@ -57,7 +57,7 @@ garble -literals build std
 -- go.mod --
 module test/main
 
-go 1.17
+go 1.18
 -- main.go --
 package main
 
diff --git a/testdata/scripts/modinfo.txt b/testdata/scripts/modinfo.txt
index 781c6c0..70c5fc7 100644
--- a/testdata/scripts/modinfo.txt
+++ b/testdata/scripts/modinfo.txt
@@ -18,19 +18,18 @@ stdout -count=1 '^.+$' # expect just one line
 [short] stop # no need to verify this with -short
 
 go build -tags veryuniquebuildtag
-[!go1.18] binsubstr main$exe '(devel)'
-[go1.18] binsubstr main$exe '(devel)' 'veryuniquebuildtag' ${HEAD_COMMIT_SHA}
+binsubstr main$exe '(devel)' 'veryuniquebuildtag' ${HEAD_COMMIT_SHA}
 
 go version -m main$exe
 stdout 'path\s*test/main'
 stdout 'mod\s*test/main\s*\(devel\)'
-[go1.18] stdout 'build\s*-tags=veryuniquebuildtag'
-[go1.18] stdout 'build\s*vcs.revision='${HEAD_COMMIT_SHA}
+stdout 'build\s*-tags=veryuniquebuildtag'
+stdout 'build\s*vcs.revision='${HEAD_COMMIT_SHA}
 
 -- go.mod --
 module test/main
 
-go 1.17
+go 1.18
 -- main.go --
 package main
 
diff --git a/testdata/scripts/plugin.txt b/testdata/scripts/plugin.txt
index c7bbdd2..567c294 100644
--- a/testdata/scripts/plugin.txt
+++ b/testdata/scripts/plugin.txt
@@ -29,7 +29,7 @@ cmp stderr main.stderr
 -- go.mod --
 module test/main
 
-go 1.17
+go 1.18
 -- plugin/main.go --
 package main
 
diff --git a/testdata/scripts/position.txt b/testdata/scripts/position.txt
index 492a86f..81d5a31 100644
--- a/testdata/scripts/position.txt
+++ b/testdata/scripts/position.txt
@@ -19,7 +19,7 @@ stdout 'varPositions is sorted'
 -- go.mod --
 module test/main
 
-go 1.17
+go 1.18
 -- garble_main.go --
 package main
 
diff --git a/testdata/scripts/reflect.txt b/testdata/scripts/reflect.txt
index 8763779..b49f72e 100644
--- a/testdata/scripts/reflect.txt
+++ b/testdata/scripts/reflect.txt
@@ -17,7 +17,7 @@ cmp stdout main.stdout
 -- go.mod --
 module test/main
 
-go 1.17
+go 1.18
 -- garble_main.go --
 package main
 
@@ -111,7 +111,7 @@ type EmbeddingIndirect struct {
 	importedpkg.AliasIndirectNamedWithReflect
 }
 
-func printfWithoutPackage(format string, v interface{}) {
+func printfWithoutPackage(format string, v any) {
 	s := fmt.Sprintf(format, v)
 	if i := strings.IndexByte(s, '.'); i > 0 {
 		s = s[i+1:]
@@ -135,7 +135,7 @@ type IndirectReflection struct {
 	ReflectionField string
 }
 
-func indirectReflection(v interface{}) {
+func indirectReflection(v any) {
 	fmt.Println(reflect.TypeOf(v).Field(0).Name)
 }
 
diff --git a/testdata/scripts/reverse.txt b/testdata/scripts/reverse.txt
index 4bf6ef4..fd1f97c 100644
--- a/testdata/scripts/reverse.txt
+++ b/testdata/scripts/reverse.txt
@@ -26,9 +26,7 @@ cp stderr build-error.stderr
 
 stdin build-error.stderr
 garble reverse ./build-error
-# Go 1.18 changed the error format slightly.
-[!go1.18] cmp stdout build-error-reverse.stdout-go1.17
-[go1.18] cmp stdout build-error-reverse.stdout-go1.18
+cmp stdout build-error-reverse.stdout
 
 [short] stop # no need to verify this with -short
 
@@ -54,7 +52,7 @@ cmp stdout main-literals.stderr
 -- go.mod --
 module test/main
 
-go 1.17
+go 1.18
 -- long_main.go --
 package main
 
@@ -157,12 +155,7 @@ main.main(...)
 	test/main/long_main.go:11 +0x??
 
 main filename: test/main/long_main.go
--- build-error-reverse.stdout-go1.17 --
-# test/main/build-error
-test/main/build-error/error.go:18: cannot convert UnobfuscatedStruct{} (type UnobfuscatedStruct) to type struct { SomeField int }
-exit status 2
-exit status 2
--- build-error-reverse.stdout-go1.18 --
+-- build-error-reverse.stdout --
 # test/main/build-error
 test/main/build-error/error.go:18: cannot convert UnobfuscatedStruct{} (value of type UnobfuscatedStruct) to type struct{SomeField int}
 exit status 2
diff --git a/testdata/scripts/seed-cache.txt b/testdata/scripts/seed-cache.txt
index 0cb945a..78c4880 100644
--- a/testdata/scripts/seed-cache.txt
+++ b/testdata/scripts/seed-cache.txt
@@ -34,7 +34,7 @@ cd ..
 -- mod1/go.mod --
 module test/main/mod1
 
-go 1.17
+go 1.18
 
 require gopkg.in/garbletest.v2 v2.999.0
 
@@ -54,7 +54,7 @@ func main() { garbletest.Test() }
 -- mod2/go.mod --
 module test/main/mod2
 
-go 1.17
+go 1.18
 
 require gopkg.in/garbletest.v2 v2.999.0
 
diff --git a/testdata/scripts/seed.txt b/testdata/scripts/seed.txt
index dd53e3e..d3364f0 100644
--- a/testdata/scripts/seed.txt
+++ b/testdata/scripts/seed.txt
@@ -99,7 +99,7 @@ cmp stderr importedpkg.stderr
 -- go.mod --
 module test/main
 
-go 1.17
+go 1.18
 -- main.go --
 package main
 
@@ -131,7 +131,7 @@ func mainFunc() {
 
 // A workaround to fool garble's reflect detection,
 // because we want it to show us the obfuscated NamedType.
-var NamedTypeValue interface{} = NamedType{}
+var NamedTypeValue any = NamedType{}
 
 type NamedType struct {
 	NamedField int
@@ -159,7 +159,7 @@ func NamedFunc() string {
 	return CallerFuncName()
 }
 
-func PrintNames(v interface{}, fn func() string) {
+func PrintNames(v any, fn func() string) {
 	typ := reflect.TypeOf(v)
 	println("path:", typ.PkgPath())
 	println("type:", typ.Name())
diff --git a/testdata/scripts/syntax.txt b/testdata/scripts/syntax.txt
index a27cc57..6c7cc14 100644
--- a/testdata/scripts/syntax.txt
+++ b/testdata/scripts/syntax.txt
@@ -19,7 +19,7 @@ binsubstr main$exe 'globalVar' # 'globalType' matches on some, but not all, plat
 -- extra/go.mod --
 module private.source/extra
 
-go 1.17
+go 1.18
 -- extra/extra.go --
 package extra
 
@@ -29,7 +29,7 @@ func Func() string {
 -- go.mod --
 module test/main
 
-go 1.17
+go 1.18
 
 // We include an extra module to obfuscate, included in the same original source
 // code via a replace directive.
@@ -48,7 +48,7 @@ import (
 )
 
 // This comment contains valuable information. Ensure it's not in the final binary.
-var V interface{}
+var V any
 
 type T struct {
 	ast.Node
@@ -193,7 +193,7 @@ func Test() {
 	}
 }
 
-func noop(...interface{}) {}
+func noop(...any) {}
 
 // Funcs that almost look like test funcs used to make garble panic.
 
diff --git a/testdata/scripts/test.txt b/testdata/scripts/test.txt
index c7addd3..2fb7f4b 100644
--- a/testdata/scripts/test.txt
+++ b/testdata/scripts/test.txt
@@ -41,7 +41,7 @@ stdout 'package bar_test, func name: test/bar\.OriginalFuncName'
 -- go.mod --
 module test/bar
 
-go 1.17
+go 1.18
 -- bar.go --
 package bar
 
diff --git a/testdata/scripts/tiny.txt b/testdata/scripts/tiny.txt
index 34b0c41..b3942a6 100644
--- a/testdata/scripts/tiny.txt
+++ b/testdata/scripts/tiny.txt
@@ -26,14 +26,14 @@ stderr 'panic: oh noes'
 -- go.mod --
 module test/main
 
-go 1.17
+go 1.18
 -- garble_main.go --
 package main
 
 import "runtime"
 
 func main() {
-	var v interface{} = "tada"
+	var v any = "tada"
 	println(v)
 
 	defer func() {