diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 878509e..3d5f904 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -22,7 +22,7 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: [1.19.x, 1.20.0-rc.3]
+        go-version: [1.19.x, 1.20.x]
         # TODO: revert to macos-latest once we figure out https://github.com/burrowers/garble/issues/609.
         os: [ubuntu-latest, macos-11, windows-latest]
     runs-on: ${{ matrix.os }}
@@ -47,20 +47,20 @@ jobs:
     # Static checks from this point forward. Only run on one Go version and on
     # Linux, since it's the fastest platform, and the tools behave the same.
     - name: Test third-party project builds
-      if: matrix.os == 'ubuntu-latest' && matrix.go-version == '1.19.x'
+      if: matrix.os == 'ubuntu-latest' && matrix.go-version == '1.20.x'
       run: |
         go install
         ./scripts/check-third-party.sh
-    - if: matrix.os == 'ubuntu-latest' && matrix.go-version == '1.19.x'
+    - if: matrix.os == 'ubuntu-latest' && matrix.go-version == '1.20.x'
       run: ./scripts/crlf-test.sh
-    - if: matrix.os == 'ubuntu-latest' && matrix.go-version == '1.19.x'
+    - if: matrix.os == 'ubuntu-latest' && matrix.go-version == '1.20.x'
       run: diff <(echo -n) <(gofmt -d .)
-    - if: matrix.os == 'ubuntu-latest' && matrix.go-version == '1.19.x'
+    - if: matrix.os == 'ubuntu-latest' && matrix.go-version == '1.20.x'
       run: go vet ./...
-    - if: matrix.os == 'ubuntu-latest' && matrix.go-version == '1.19.x'
+    - if: matrix.os == 'ubuntu-latest' && matrix.go-version == '1.20.x'
       uses: dominikh/staticcheck-action@v1
       with:
-        version: "2022.1.3"
+        version: "2023.1"
         install-go: false
 
   # We don't care about GOARCH=386 particularly,
@@ -74,18 +74,17 @@ jobs:
     steps:
     - uses: actions/setup-go@v3
       with:
-        go-version: 1.19.x
+        go-version: 1.20.x
     - uses: actions/checkout@v3
     - name: Test
       run: go test -timeout=15m ./...
 
   test-gotip:
-    if: false # let tip for 1.21 settle a bit
     runs-on: ubuntu-latest
     steps:
     - name: Install Go
       env:
-        GO_COMMIT: cb07765045aed5104a3df31507564ac99e6ddce8 # 2022-12-13
+        GO_COMMIT: 6d4de4e386cd9e4ec32937ab2d4f79317db461cd # 2023-01-31
       run: |
         cd $HOME
         mkdir $HOME/gotip
@@ -93,7 +92,7 @@ jobs:
 
         wget -O gotip.tar.gz https://go.googlesource.com/go/+archive/${GO_COMMIT}.tar.gz
         tar -xf gotip.tar.gz
-        echo "devel go1.20-${GO_COMMIT}" >VERSION
+        echo "devel go1.21-${GO_COMMIT}" >VERSION
 
         cd src
         ./make.bash
diff --git a/main.go b/main.go
index 7fbbf08..7b0b6bf 100644
--- a/main.go
+++ b/main.go
@@ -263,7 +263,7 @@ var toolchainVersionSemver string
 func goVersionOK() bool {
 	const (
 		minGoVersionSemver = "v1.19.0"
-		suggestedGoVersion = "1.19.x"
+		suggestedGoVersion = "1.20.x"
 	)
 
 	// rxVersion looks for a version like "go1.2" or "go1.2.3"
diff --git a/testdata/script/goversion.txtar b/testdata/script/goversion.txtar
index e50a72b..b9a89fb 100644
--- a/testdata/script/goversion.txtar
+++ b/testdata/script/goversion.txtar
@@ -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\.19\.x or newer'
+stderr 'Go version is too old; please upgrade to Go 1\.20\.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\.19\.x or newer'
+stderr 'Go version is too old; please upgrade to Go 1\.20\.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\.19\.x'
+stderr 'Go version "devel go1\.15-.*2020.*" is too old; please upgrade to Go 1\.20\.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\.19\.x or newer'
+stderr 'Go version "go1\.14" is too old; please upgrade to Go 1\.20\.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.