diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index 6ff073a..db2bc74 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -27,6 +27,7 @@ jobs:
           - '1.20'
           - '1.21'
           - '1.22'
+          - '1.23'
 
     steps:
       - uses: actions/checkout@v2
@@ -62,10 +63,10 @@ jobs:
         run: go vet -unsafeptr=false ./...
 
       - name: 'Staticcheck'
-        # staticcheck requires go1.19.
-        if: ${{ matrix.arch == 'x64' && matrix.go >= '1.19' }}
+        # staticcheck requires go1.22.
+        if: ${{ matrix.arch == 'x64' && matrix.go >= '1.22' }}
         run: |
-          go install honnef.co/go/tools/cmd/staticcheck@v0.4.3
+          go install honnef.co/go/tools/cmd/staticcheck@v0.5.0
           staticcheck ./...
 
       - name: 'GCAssert'
diff --git a/bigint_go1.15_test.go b/bigint_go1.15_test.go
index fd04115..83a16bf 100644
--- a/bigint_go1.15_test.go
+++ b/bigint_go1.15_test.go
@@ -65,7 +65,7 @@ func TestBigIntFillBytes(t *testing.T) {
 		"0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
 	} {
 		t.Run(n, func(t *testing.T) {
-			t.Logf(n)
+			t.Log(n)
 			x, ok := new(BigInt).SetString(n, 0)
 			if !ok {
 				panic("invalid test entry")
diff --git a/decimal_test.go b/decimal_test.go
index ef6a475..bc00e04 100644
--- a/decimal_test.go
+++ b/decimal_test.go
@@ -491,6 +491,22 @@ func TestFormat(t *testing.T) {
 	}
 }
 
+// fmtAllowsPaddingAndMinusFlags is set to true if the %-0 flag combination is
+// allowed. This combination was not allowed before Go 1.23, but it is allowed
+// in Go 1.23 and later. See https://github.com/golang/go/issues/61784 for
+// details.
+var fmtAllowsPaddingAndMinusFlags bool
+
+// The following type definition, customer formatter implementation, and init
+// function are used to test for fmtAllowsPaddingAndMinusFlags.
+type fmtAllowsPaddingAndMinusFlagsHelper struct{}
+
+func (fmtAllowsPaddingAndMinusFlagsHelper) Format(s fmt.State, format rune) {
+	fmtAllowsPaddingAndMinusFlags = s.Flag('-') && s.Flag('0')
+}
+
+func init() { fmt.Printf("%-0s", fmtAllowsPaddingAndMinusFlagsHelper{}) }
+
 func TestFormatFlags(t *testing.T) {
 	const stdD = "1.23E+56"
 	tests := []struct {
@@ -531,7 +547,22 @@ func TestFormatFlags(t *testing.T) {
 		{
 			d:   stdD,
 			fmt: "%-010G",
-			out: "1.23E+56  ",
+			out: func() string {
+				if !fmtAllowsPaddingAndMinusFlags {
+					return "1.23E+56  "
+				}
+				return "001.23E+56"
+			}(),
+		},
+		{
+			d:   stdD,
+			fmt: "%0-10G",
+			out: func() string {
+				if !fmtAllowsPaddingAndMinusFlags {
+					return "1.23E+56  "
+				}
+				return "001.23E+56"
+			}(),
 		},
 		{
 			d:   "nan",