diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 2101d8c..0600cc4 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -22,7 +22,7 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: [1.18.x, 1.19.x]
+        go-version: [1.19.x]
         os: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.os }}
     steps:
diff --git a/go.mod b/go.mod
index 29078bf..4857de4 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module mvdan.cc/garble
 
-go 1.18
+go 1.19
 
 require (
 	github.com/frankban/quicktest v1.14.3
diff --git a/main.go b/main.go
index a299826..4ae6323 100644
--- a/main.go
+++ b/main.go
@@ -253,8 +253,8 @@ var toolchainVersionSemver string
 
 func goVersionOK() bool {
 	const (
-		minGoVersionSemver = "v1.18.0"
-		suggestedGoVersion = "1.18.x"
+		minGoVersionSemver = "v1.19.0"
+		suggestedGoVersion = "1.19.x"
 	)
 
 	// rxVersion looks for a version like "go1.2" or "go1.2.3"
diff --git a/testdata/script/asm.txtar b/testdata/script/asm.txtar
index 40e8e69..70b36c7 100644
--- a/testdata/script/asm.txtar
+++ b/testdata/script/asm.txtar
@@ -28,11 +28,10 @@ go build
 exec ./main
 cmp stderr main.stderr
 binsubstr main$exe 'privateAdd' 'PublicAdd'
-
 -- go.mod --
 module test/main
 
-go 1.18
+go 1.19
 -- main.go --
 package main
 
diff --git a/testdata/script/basic.txtar b/testdata/script/basic.txtar
index 678e8d5..ae94531 100644
--- a/testdata/script/basic.txtar
+++ b/testdata/script/basic.txtar
@@ -56,11 +56,10 @@ cmp stderr main.stderr
 # Only check $WORK on non-windows, because it's difficult to do it there.
 binsubstr main$exe 'garble_main.go' 'globalVar' 'globalFunc' $gofullversion
 [!windows] binsubstr main$exe ${WORK}
-
 -- go.mod --
 module test/mainfoo
 
-go 1.18
+go 1.19
 -- garble_main.go --
 package main
 
diff --git a/testdata/script/cgo.txtar b/testdata/script/cgo.txtar
index 0f48b23..570ae74 100644
--- a/testdata/script/cgo.txtar
+++ b/testdata/script/cgo.txtar
@@ -34,11 +34,10 @@ go build
 exec ./main
 cmp stdout main.stdout
 binsubstr main$exe 'privateAdd'
-
 -- go.mod --
 module test/main
 
-go 1.18
+go 1.19
 -- main.go --
 package main
 
diff --git a/testdata/script/crossbuild.txtar b/testdata/script/crossbuild.txtar
index 27165cd..ff8b242 100644
--- a/testdata/script/crossbuild.txtar
+++ b/testdata/script/crossbuild.txtar
@@ -11,11 +11,10 @@
 # A fairly average Go build, importing some std libraries.
 env GOGARBLE='*'
 garble build
-
 -- go.mod --
 module test/main
 
-go 1.18
+go 1.19
 -- main.go --
 package main
 
diff --git a/testdata/script/debugdir.txtar b/testdata/script/debugdir.txtar
index 464178b..c29b752 100644
--- a/testdata/script/debugdir.txtar
+++ b/testdata/script/debugdir.txtar
@@ -14,11 +14,10 @@ cp $WORK/debug1/test/main/main.go $WORK/debug1/some_file_from_prev_build.go
 garble -debugdir ./debug1 build -v
 stderr 'test/main' # we force rebuilds with -debugdir
 ! exists $WORK/debug1/some_file_from_prev_build.go
-
 -- go.mod --
 module test/main
 
-go 1.18
+go 1.19
 -- main.go --
 package main
 
diff --git a/testdata/script/embed.txtar b/testdata/script/embed.txtar
index 962b4f5..c8f9052 100644
--- a/testdata/script/embed.txtar
+++ b/testdata/script/embed.txtar
@@ -10,12 +10,10 @@ cmp stdout main.stdout
 go build
 exec ./main
 cmp stdout main.stdout
-
 -- go.mod --
 module test/main
 
-go 1.18
-
+go 1.19
 -- main.go --
 package main
 
diff --git a/testdata/script/goenv.txtar b/testdata/script/goenv.txtar
index 19469c4..82ab164 100644
--- a/testdata/script/goenv.txtar
+++ b/testdata/script/goenv.txtar
@@ -43,11 +43,10 @@ exec $NAME/garble$exe build
 [!windows] sleep $CP_EXEC_SLEEP
 [!windows] ! exec $NAME/garble$exe build
 [!windows] stderr 'cannot be quoted'
-
 -- go.mod --
 module test/main
 
-go 1.18
+go 1.19
 -- main.go --
 package main
 
diff --git a/testdata/script/gogarble.txtar b/testdata/script/gogarble.txtar
index 1ab96ab..640c18f 100644
--- a/testdata/script/gogarble.txtar
+++ b/testdata/script/gogarble.txtar
@@ -46,11 +46,10 @@ env GOCACHE=${WORK}/gocache-empty
 garble build -a runtime
 garble build -o=out_rebuild ./stdimporter
 bincmp out_rebuild out
-
 -- go.mod --
 module test/main
 
-go 1.18
+go 1.19
 -- standalone/main.go --
 package main
 
diff --git a/testdata/script/goversion.txtar b/testdata/script/goversion.txtar
index 0fe5ac1..e50a72b 100644
--- a/testdata/script/goversion.txtar
+++ b/testdata/script/goversion.txtar
@@ -7,30 +7,30 @@ 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\.18\.x or newer'
+stderr 'Go version is too old; please upgrade to Go 1\.19\.x or newer'
 
 # 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\.18\.x or newer'
+stderr 'Go version is too old; please upgrade to Go 1\.19\.x or newer'
 
 # 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\.18\.x'
+stderr 'Go version "devel go1\.15-.*2020.*" is too old; please upgrade to Go 1\.19\.x'
 
 # A current devel version should be fine.
 # Note that we don't look at devel version timestamps.
-env GARBLE_TEST_GOVERSION='go1.18'
-env TOOLCHAIN_GOVERSION='devel go1.18-ad97d204f0 Sun Sep 12 16:46:58 2021 +0000'
+env GARBLE_TEST_GOVERSION='go1.20'
+env TOOLCHAIN_GOVERSION='devel go1.20-ad97d204f0 Sun Sep 12 16:46:58 2021 +0000'
 ! garble build
 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\.18\.x or newer'
+stderr 'Go version "go1\.14" is too old; please upgrade to Go 1\.19\.x or newer'
 
 # We should accept a future stable version.
 # Note that we need to bump the version of Go that supposedly built it, too.
@@ -40,13 +40,13 @@ env TOOLCHAIN_GOVERSION='go1.28.2'
 stderr 'mocking the real build'
 
 # We should accept custom devel strings.
-env TOOLCHAIN_GOVERSION='devel go1.18-somecustomversion'
+env TOOLCHAIN_GOVERSION='devel go1.20-somecustomversion'
 ! garble build
 stderr 'mocking the real build'
 
 # The current toolchain may be older than the one that built garble.
-env GARBLE_TEST_GOVERSION='go1.19'
-env TOOLCHAIN_GOVERSION='go1.18.3'
+env GARBLE_TEST_GOVERSION='go1.20'
+env TOOLCHAIN_GOVERSION='go1.19.3'
 ! garble build
 stderr 'mocking the real build'
 
@@ -64,22 +64,21 @@ stderr 'garble was built with "go1\.18" and is being used with "go1\.19\.1"; ple
 
 # 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.
-env GARBLE_TEST_GOVERSION='go1.18.11'
-env TOOLCHAIN_GOVERSION='go1.18.14'
+env GARBLE_TEST_GOVERSION='go1.19.11'
+env TOOLCHAIN_GOVERSION='go1.19.14'
 ! garble build
-stderr 'garble was built with "go1\.18\.11" and is being used with "go1\.18\.14"; please rebuild garble with the newer version'
+stderr 'garble was built with "go1\.19\.11" and is being used with "go1\.19\.14"; please rebuild garble with the newer version'
 
 # 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='go1.18.3'
+env TOOLCHAIN_GOVERSION='go1.19.3'
 ! garble build
 stderr 'mocking the real build'
-
 -- go.mod --
 module test/main
 
-go 1.18
+go 1.19
 -- main.go --
 package main
 
diff --git a/testdata/script/help.txtar b/testdata/script/help.txtar
index b9b830a..c0c7ac3 100644
--- a/testdata/script/help.txtar
+++ b/testdata/script/help.txtar
@@ -118,5 +118,7 @@ stderr 'usage: garble version'
 # We need a dummy module for "garble build -badflag".
 -- go.mod --
 module dummy
+
+go 1.19
 -- dummy.go --
 package dummy
diff --git a/testdata/script/implement.txtar b/testdata/script/implement.txtar
index bc99902..3dff9e5 100644
--- a/testdata/script/implement.txtar
+++ b/testdata/script/implement.txtar
@@ -12,11 +12,10 @@ cmp stdout main.stdout
 go build
 exec ./main
 cmp stdout main.stdout
-
 -- go.mod --
 module test/main
 
-go 1.18
+go 1.19
 -- main.go --
 package main
 
diff --git a/testdata/script/imports.txtar b/testdata/script/imports.txtar
index 3f9d382..5659e0a 100644
--- a/testdata/script/imports.txtar
+++ b/testdata/script/imports.txtar
@@ -41,11 +41,10 @@ cmp stdout main.stdout
 garble -literals build --tags=buildtag
 exec ./main
 cmp stdout main.stdout
-
 -- go.mod --
 module test/main
 
-go 1.18
+go 1.19
 
 require (
 	gopkg.in/garbletest.v2 v2.999.0
diff --git a/testdata/script/init.txtar b/testdata/script/init.txtar
index 0e7eda9..bcfc334 100644
--- a/testdata/script/init.txtar
+++ b/testdata/script/init.txtar
@@ -9,11 +9,10 @@ cmp stderr main.stderr
 go build
 exec ./main
 cmp stderr main.stderr
-
 -- go.mod --
 module test/main
 
-go 1.18
+go 1.19
 -- main.go --
 package main
 
diff --git a/testdata/script/ldflags.txtar b/testdata/script/ldflags.txtar
index 79406cc..c41e795 100644
--- a/testdata/script/ldflags.txtar
+++ b/testdata/script/ldflags.txtar
@@ -27,11 +27,10 @@ go build -ldflags=${LDFLAGS}
 exec ./main
 cmp stdout main.stdout
 binsubstr main$exe 'unexportedVersion' 'ExportedUnset' 'v1.22.33' 'garble_replaced'
-
 -- go.mod --
 module domain.test/main
 
-go 1.18
+go 1.19
 -- main.go --
 package main
 
diff --git a/testdata/script/linkname.txtar b/testdata/script/linkname.txtar
index cf5ec23..410934c 100644
--- a/testdata/script/linkname.txtar
+++ b/testdata/script/linkname.txtar
@@ -11,18 +11,14 @@ cmp stderr main.stderr
 go build
 exec ./main
 cmp stderr main.stderr
-
 -- go.mod --
 module test/main
 
-go 1.18
+go 1.19
 
 replace big.chungus/meme => ./big.chungus/meme
 
-require (
-	big.chungus/meme v0.0.0
-)
-
+require big.chungus/meme v0.0.0
 -- a.go --
 package main
 
@@ -99,8 +95,7 @@ func ByteIndex(s string, c byte) int
 -- big.chungus/meme/go.mod --
 module test/main
 
-go 1.18
-
+go 1.19
 -- big.chungus/meme/dante.go --
 package meme
 
diff --git a/testdata/script/literals.txtar b/testdata/script/literals.txtar
index 7902d32..757692c 100644
--- a/testdata/script/literals.txtar
+++ b/testdata/script/literals.txtar
@@ -54,11 +54,10 @@ grep '^\s+\w+ = .*\bappend\(\w+,(\s+\w+\[\d+\][\^\-+]\w+\[\d+\],?)+\)$' debug1/t
 # Analogous to gogarble.txt.
 env GOGARBLE='*'
 garble -literals build std
-
 -- go.mod --
 module test/main
 
-go 1.18
+go 1.19
 -- main.go --
 package main
 
diff --git a/testdata/script/modinfo.txtar b/testdata/script/modinfo.txtar
index 70c5fc7..a947ad8 100644
--- a/testdata/script/modinfo.txtar
+++ b/testdata/script/modinfo.txtar
@@ -25,11 +25,10 @@ stdout 'path\s*test/main'
 stdout 'mod\s*test/main\s*\(devel\)'
 stdout 'build\s*-tags=veryuniquebuildtag'
 stdout 'build\s*vcs.revision='${HEAD_COMMIT_SHA}
-
 -- go.mod --
 module test/main
 
-go 1.18
+go 1.19
 -- main.go --
 package main
 
diff --git a/testdata/script/plugin.txtar b/testdata/script/plugin.txtar
index 567c294..0fbdc4b 100644
--- a/testdata/script/plugin.txtar
+++ b/testdata/script/plugin.txtar
@@ -25,11 +25,10 @@ binsubstr plugin.so 'PublicVar' 'PublicFunc' 'privateFunc'
 go build
 exec ./main
 cmp stderr main.stderr
-
 -- go.mod --
 module test/main
 
-go 1.18
+go 1.19
 -- plugin/main.go --
 package main
 
diff --git a/testdata/script/position.txtar b/testdata/script/position.txtar
index 2a5ff34..2e4bb5f 100644
--- a/testdata/script/position.txtar
+++ b/testdata/script/position.txtar
@@ -15,11 +15,10 @@ stdout 'garble_other_filename'
 stdout ':19: main'
 stdout 'initPositions is sorted'
 stdout 'varPositions is sorted'
-
 -- go.mod --
 module test/main
 
-go 1.18
+go 1.19
 -- garble_main.go --
 package main
 
diff --git a/testdata/script/reflect.txtar b/testdata/script/reflect.txtar
index adac6f6..4f838b5 100644
--- a/testdata/script/reflect.txtar
+++ b/testdata/script/reflect.txtar
@@ -13,11 +13,10 @@ binsubstr main$exe 'ReflectInDefined' 'ExportedField2' 'unexportedField2' 'Indir
 go build
 exec ./main
 cmp stdout main.stdout
-
 -- go.mod --
 module test/main
 
-go 1.18
+go 1.19
 -- garble_main.go --
 package main
 
diff --git a/testdata/script/reverse.txtar b/testdata/script/reverse.txtar
index 9d296d1..fdbca36 100644
--- a/testdata/script/reverse.txtar
+++ b/testdata/script/reverse.txtar
@@ -52,11 +52,10 @@ cmp stdout reverse.stdout
 stdin main-literals.stderr
 ! garble reverse .
 cmp stdout main-literals.stderr
-
 -- go.mod --
 module test/main
 
-go 1.18
+go 1.19
 -- long_main.go --
 package main
 
diff --git a/testdata/script/seed-cache.txtar b/testdata/script/seed-cache.txtar
index 78c4880..99e2300 100644
--- a/testdata/script/seed-cache.txtar
+++ b/testdata/script/seed-cache.txtar
@@ -30,11 +30,10 @@ cp stdout ../buildid-mod2
 cd ..
 
 ! bincmp buildid-mod1 buildid-mod2
-
 -- mod1/go.mod --
 module test/main/mod1
 
-go 1.18
+go 1.19
 
 require gopkg.in/garbletest.v2 v2.999.0
 
@@ -54,7 +53,7 @@ func main() { garbletest.Test() }
 -- mod2/go.mod --
 module test/main/mod2
 
-go 1.18
+go 1.19
 
 require gopkg.in/garbletest.v2 v2.999.0
 
diff --git a/testdata/script/seed.txtar b/testdata/script/seed.txtar
index d3364f0..02b10ab 100644
--- a/testdata/script/seed.txtar
+++ b/testdata/script/seed.txtar
@@ -95,11 +95,10 @@ exec ./main$exe test/main
 cmp stderr mainpkg.stderr
 exec ./main$exe test/main/imported
 cmp stderr importedpkg.stderr
-
 -- go.mod --
 module test/main
 
-go 1.18
+go 1.19
 -- main.go --
 package main
 
diff --git a/testdata/script/syntax.txtar b/testdata/script/syntax.txtar
index 6c7cc14..7cb297b 100644
--- a/testdata/script/syntax.txtar
+++ b/testdata/script/syntax.txtar
@@ -15,11 +15,10 @@ cmp stderr main.stderr
 
 binsubstr main$exe 'globalVar' # 'globalType' matches on some, but not all, platforms
 ! binsubstr main$exe 'localName' 'globalConst' 'remoteIntReturn' 'intReturn'
-
 -- extra/go.mod --
 module private.source/extra
 
-go 1.18
+go 1.19
 -- extra/extra.go --
 package extra
 
@@ -29,7 +28,7 @@ func Func() string {
 -- go.mod --
 module test/main
 
-go 1.18
+go 1.19
 
 // We include an extra module to obfuscate, included in the same original source
 // code via a replace directive.
diff --git a/testdata/script/test.txtar b/testdata/script/test.txtar
index ea87019..f192bea 100644
--- a/testdata/script/test.txtar
+++ b/testdata/script/test.txtar
@@ -47,11 +47,10 @@ stdout 'PASS.*TestFoo'
 stdout 'PASS.*TestSeparateFoo'
 stdout 'package bar, func name: test/bar\.OriginalFuncName'
 stdout 'package bar_test, func name: test/bar\.OriginalFuncName'
-
 -- go.mod --
 module test/bar
 
-go 1.18
+go 1.19
 -- bar.go --
 package bar
 
diff --git a/testdata/script/tiny.txtar b/testdata/script/tiny.txtar
index 07568d9..5eb3eaf 100644
--- a/testdata/script/tiny.txtar
+++ b/testdata/script/tiny.txtar
@@ -23,11 +23,10 @@ garble build
 stderr '^caller: [0-9a-zA-Z_]+\.go [1-9]'
 stderr '^recovered: ya like jazz?'
 stderr 'panic: oh noes'
-
 -- go.mod --
 module test/main
 
-go 1.18
+go 1.19
 -- garble_main.go --
 package main
 
diff --git a/testdata/script/typeparams.txtar b/testdata/script/typeparams.txtar
index f2f9898..02dd341 100644
--- a/testdata/script/typeparams.txtar
+++ b/testdata/script/typeparams.txtar
@@ -2,12 +2,10 @@ env GOGARBLE=*
 
 garble build
 ! binsubstr main$exe ${WORK} 'garble_main.go' 'GenericFunc' 'GenericVector' 'PredeclaredSignedInteger' 'StringableSignedInteger' 'CombineEmbeds' 'GenericParam'
-
 -- go.mod --
 module test/main
 
-go 1.18
-
+go 1.19
 -- garble_main.go --
 package main