diff --git a/godeltaprof/compat/scale_test.go b/godeltaprof/compat/scale_test.go
index 150ef5d..ffc8c15 100644
--- a/godeltaprof/compat/scale_test.go
+++ b/godeltaprof/compat/scale_test.go
@@ -32,6 +32,7 @@ func TestScaleMutex(t *testing.T) {
 	const workers = 2
 	const expectedCount = workers * iters
 	const expectedTime = expectedCount * 1000000
+	const e = 0.4
 
 	runtime.SetMutexProfileFraction(fraction)
 
@@ -63,8 +64,8 @@ func TestScaleMutex(t *testing.T) {
 	fmt.Println(my.value[0], my.value[1])
 	fmt.Println(expectedCount, expectedTime)
 
-	assert.Less(t, math.Abs(float64(my.value[0])-float64(expectedCount)), 0.4*float64(expectedCount))
-	assert.Less(t, math.Abs(float64(my.value[1])-float64(expectedTime)), 0.4*float64(expectedTime))
+	assert.Less(t, math.Abs(float64(my.value[0])-float64(expectedCount)), e*float64(expectedCount))
+	assert.Less(t, math.Abs(float64(my.value[1])-float64(expectedTime)), e*float64(expectedTime))
 }
 
 func TestScaleBlock(t *testing.T) {
diff --git a/godeltaprof/compat/stub_go20_test.go b/godeltaprof/compat/stub_go20_test.go
index 86efa9f..2bd5c34 100644
--- a/godeltaprof/compat/stub_go20_test.go
+++ b/godeltaprof/compat/stub_go20_test.go
@@ -16,3 +16,21 @@ func TestRuntimeFrameStartLine(t *testing.T) {
 		"runtime_FrameStartLine",
 		"func github.com/grafana/pyroscope-go/godeltaprof/internal/pprof.runtime_FrameStartLine(f *runtime.Frame) int")
 }
+
+func TestRuntimeExpandFinalInlineFrame(t *testing.T) {
+	checkSignature(t, "runtime/pprof",
+		"runtime_expandFinalInlineFrame",
+		"func runtime/pprof.runtime_expandFinalInlineFrame(stk []uintptr) []uintptr")
+	checkSignature(t, "github.com/grafana/pyroscope-go/godeltaprof/internal/pprof",
+		"runtime_expandFinalInlineFrame",
+		"func github.com/grafana/pyroscope-go/godeltaprof/internal/pprof.runtime_expandFinalInlineFrame(stk []uintptr) []uintptr")
+}
+
+func TestRuntimeCyclesPerSecond(t *testing.T) {
+	checkSignature(t, "runtime/pprof",
+		"runtime_cyclesPerSecond",
+		"func runtime/pprof.runtime_cyclesPerSecond() int64")
+	checkSignature(t, "github.com/grafana/pyroscope-go/godeltaprof/internal/pprof",
+		"runtime_cyclesPerSecond",
+		"func github.com/grafana/pyroscope-go/godeltaprof/internal/pprof.runtime_cyclesPerSecond() int64")
+}
diff --git a/godeltaprof/compat/stub_go21_test.go b/godeltaprof/compat/stub_go21_test.go
deleted file mode 100644
index fc5e586..0000000
--- a/godeltaprof/compat/stub_go21_test.go
+++ /dev/null
@@ -1,26 +0,0 @@
-//go:build go1.21
-// +build go1.21
-
-package compat
-
-import (
-	"testing"
-)
-
-func TestRuntimeFrameSymbolName(t *testing.T) {
-	checkSignature(t, "runtime/pprof",
-		"runtime_FrameSymbolName",
-		"func runtime/pprof.runtime_FrameSymbolName(f *runtime.Frame) string")
-	checkSignature(t, "github.com/grafana/pyroscope-go/godeltaprof/internal/pprof",
-		"runtime_FrameSymbolName",
-		"func github.com/grafana/pyroscope-go/godeltaprof/internal/pprof.runtime_FrameSymbolName(f *runtime.Frame) string")
-}
-
-func TestRuntimeFrameStartLine(t *testing.T) {
-	checkSignature(t, "runtime/pprof",
-		"runtime_FrameStartLine",
-		"func runtime/pprof.runtime_FrameStartLine(f *runtime.Frame) int")
-	checkSignature(t, "github.com/grafana/pyroscope-go/godeltaprof/internal/pprof",
-		"runtime_FrameStartLine",
-		"func github.com/grafana/pyroscope-go/godeltaprof/internal/pprof.runtime_FrameStartLine(f *runtime.Frame) int")
-}
diff --git a/godeltaprof/compat/stub_go22_test.go b/godeltaprof/compat/stub_go22_test.go
new file mode 100644
index 0000000..ac19b18
--- /dev/null
+++ b/godeltaprof/compat/stub_go22_test.go
@@ -0,0 +1,44 @@
+//go:build go1.21 && !go1.23
+// +build go1.21,!go1.23
+
+package compat
+
+import (
+	"testing"
+)
+
+func TestRuntimeFrameSymbolName(t *testing.T) {
+	checkSignature(t, "runtime/pprof",
+		"runtime_FrameSymbolName",
+		"func runtime/pprof.runtime_FrameSymbolName(f *runtime.Frame) string")
+	checkSignature(t, "github.com/grafana/pyroscope-go/godeltaprof/internal/pprof",
+		"runtime_FrameSymbolName",
+		"func github.com/grafana/pyroscope-go/godeltaprof/internal/pprof.runtime_FrameSymbolName(f *runtime.Frame) string")
+}
+
+func TestRuntimeFrameStartLine(t *testing.T) {
+	checkSignature(t, "runtime/pprof",
+		"runtime_FrameStartLine",
+		"func runtime/pprof.runtime_FrameStartLine(f *runtime.Frame) int")
+	checkSignature(t, "github.com/grafana/pyroscope-go/godeltaprof/internal/pprof",
+		"runtime_FrameStartLine",
+		"func github.com/grafana/pyroscope-go/godeltaprof/internal/pprof.runtime_FrameStartLine(f *runtime.Frame) int")
+}
+
+func TestRuntimeExpandFinalInlineFrame(t *testing.T) {
+	checkSignature(t, "runtime/pprof",
+		"runtime_expandFinalInlineFrame",
+		"func runtime/pprof.runtime_expandFinalInlineFrame(stk []uintptr) []uintptr")
+	checkSignature(t, "github.com/grafana/pyroscope-go/godeltaprof/internal/pprof",
+		"runtime_expandFinalInlineFrame",
+		"func github.com/grafana/pyroscope-go/godeltaprof/internal/pprof.runtime_expandFinalInlineFrame(stk []uintptr) []uintptr")
+}
+
+func TestRuntimeCyclesPerSecond(t *testing.T) {
+	checkSignature(t, "runtime/pprof",
+		"runtime_cyclesPerSecond",
+		"func runtime/pprof.runtime_cyclesPerSecond() int64")
+	checkSignature(t, "github.com/grafana/pyroscope-go/godeltaprof/internal/pprof",
+		"runtime_cyclesPerSecond",
+		"func github.com/grafana/pyroscope-go/godeltaprof/internal/pprof.runtime_cyclesPerSecond() int64")
+}
diff --git a/godeltaprof/compat/stub_go23_test.go b/godeltaprof/compat/stub_go23_test.go
new file mode 100644
index 0000000..bf495a9
--- /dev/null
+++ b/godeltaprof/compat/stub_go23_test.go
@@ -0,0 +1,42 @@
+//go:build go1.23
+// +build go1.23
+
+package compat
+
+import "testing"
+
+func TestRuntimeFrameSymbolName(t *testing.T) {
+	checkSignature(t, "runtime/pprof",
+		"runtime_FrameSymbolName",
+		"func runtime/pprof.runtime_FrameSymbolName(f *runtime.Frame) string")
+	checkSignature(t, "github.com/grafana/pyroscope-go/godeltaprof/internal/pprof",
+		"runtime_FrameSymbolName",
+		"func github.com/grafana/pyroscope-go/godeltaprof/internal/pprof.runtime_FrameSymbolName(f *runtime.Frame) string")
+}
+
+func TestRuntimeFrameStartLine(t *testing.T) {
+	checkSignature(t, "runtime/pprof",
+		"runtime_FrameStartLine",
+		"func runtime/pprof.runtime_FrameStartLine(f *runtime.Frame) int")
+	checkSignature(t, "github.com/grafana/pyroscope-go/godeltaprof/internal/pprof",
+		"runtime_FrameStartLine",
+		"func github.com/grafana/pyroscope-go/godeltaprof/internal/pprof.runtime_FrameStartLine(f *runtime.Frame) int")
+}
+
+func TestRuntimeExpandFinalInlineFrame(t *testing.T) {
+	checkSignature(t, "runtime/pprof",
+		"runtime_expandFinalInlineFrame",
+		"func runtime/pprof.runtime_expandFinalInlineFrame(stk []uintptr) []uintptr")
+	checkSignature(t, "github.com/grafana/pyroscope-go/godeltaprof/internal/pprof",
+		"runtime_expandFinalInlineFrame",
+		"func github.com/grafana/pyroscope-go/godeltaprof/internal/pprof.runtime_expandFinalInlineFrame(stk []uintptr) []uintptr")
+}
+
+func TestRuntimeCyclesPerSecond(t *testing.T) {
+	checkSignature(t, "runtime",
+		"pprof_cyclesPerSecond",
+		"func runtime.pprof_cyclesPerSecond() int64")
+	checkSignature(t, "github.com/grafana/pyroscope-go/godeltaprof/internal/pprof",
+		"runtime_cyclesPerSecond",
+		"func github.com/grafana/pyroscope-go/godeltaprof/internal/pprof.runtime_cyclesPerSecond() int64")
+}
diff --git a/godeltaprof/compat/stub_test.go b/godeltaprof/compat/stub_test.go
index c9d97cf..3d94fe8 100644
--- a/godeltaprof/compat/stub_test.go
+++ b/godeltaprof/compat/stub_test.go
@@ -10,30 +10,6 @@ import (
 	"golang.org/x/tools/go/packages"
 )
 
-func TestSignatureExpandFinalInlineFrame(t *testing.T) {
-	checkSignature(t, "github.com/grafana/pyroscope-go/godeltaprof/internal/pprof",
-		"runtime_expandFinalInlineFrame",
-		"func github.com/grafana/pyroscope-go/godeltaprof/internal/pprof.runtime_expandFinalInlineFrame(stk []uintptr) []uintptr")
-}
-
-func TestSignatureCyclesPerSecond(t *testing.T) {
-	checkSignature(t, "github.com/grafana/pyroscope-go/godeltaprof/internal/pprof",
-		"runtime_cyclesPerSecond",
-		"func github.com/grafana/pyroscope-go/godeltaprof/internal/pprof.runtime_cyclesPerSecond() int64")
-}
-
-func TestSignatureCyclesPerSecondRuntime(t *testing.T) {
-	checkSignature(t, "runtime/pprof",
-		"runtime_cyclesPerSecond",
-		"func runtime/pprof.runtime_cyclesPerSecond() int64")
-}
-
-func TestSignatureExpandFinalInlineFrameRuntime(t *testing.T) {
-	checkSignature(t, "runtime/pprof",
-		"runtime_expandFinalInlineFrame",
-		"func runtime/pprof.runtime_expandFinalInlineFrame(stk []uintptr) []uintptr")
-}
-
 func checkSignature(t *testing.T, pkg string, name string, expectedSignature string) {
 	cfg := &packages.Config{
 		Mode:  packages.NeedImports | packages.NeedExportFile | packages.NeedTypes | packages.NeedSyntax,
diff --git a/godeltaprof/internal/pprof/stub.go b/godeltaprof/internal/pprof/stub.go
index 41dee8b..5b7d583 100644
--- a/godeltaprof/internal/pprof/stub.go
+++ b/godeltaprof/internal/pprof/stub.go
@@ -1,14 +1,5 @@
 package pprof
 
-// unsafe is required for go:linkname
-import _ "unsafe"
-
-//go:linkname runtime_expandFinalInlineFrame runtime/pprof.runtime_expandFinalInlineFrame
-func runtime_expandFinalInlineFrame(stk []uintptr) []uintptr
-
-//go:linkname runtime_cyclesPerSecond runtime/pprof.runtime_cyclesPerSecond
-func runtime_cyclesPerSecond() int64
-
 func Runtime_cyclesPerSecond() int64 {
 	return runtime_cyclesPerSecond()
 }
diff --git a/godeltaprof/internal/pprof/stub_go20.go b/godeltaprof/internal/pprof/stub_go20.go
index d271cbc..7a32846 100644
--- a/godeltaprof/internal/pprof/stub_go20.go
+++ b/godeltaprof/internal/pprof/stub_go20.go
@@ -3,7 +3,10 @@
 
 package pprof
 
-import "runtime"
+import (
+	"runtime"
+	_ "unsafe"
+)
 
 // runtime_FrameStartLine is defined in runtime/symtab.go.
 func runtime_FrameStartLine(f *runtime.Frame) int {
@@ -14,3 +17,9 @@ func runtime_FrameStartLine(f *runtime.Frame) int {
 func runtime_FrameSymbolName(f *runtime.Frame) string {
 	return f.Function
 }
+
+//go:linkname runtime_expandFinalInlineFrame runtime/pprof.runtime_expandFinalInlineFrame
+func runtime_expandFinalInlineFrame(stk []uintptr) []uintptr
+
+//go:linkname runtime_cyclesPerSecond runtime/pprof.runtime_cyclesPerSecond
+func runtime_cyclesPerSecond() int64
diff --git a/godeltaprof/internal/pprof/stub_go22.go b/godeltaprof/internal/pprof/stub_go22.go
new file mode 100644
index 0000000..02c726f
--- /dev/null
+++ b/godeltaprof/internal/pprof/stub_go22.go
@@ -0,0 +1,27 @@
+//go:build go1.21 && !go1.23
+// +build go1.21,!go1.23
+
+package pprof
+
+import (
+	"runtime"
+	_ "unsafe"
+)
+
+// runtime_FrameStartLine is defined in runtime/symtab.go.
+//
+//go:noescape
+//go:linkname runtime_FrameStartLine runtime/pprof.runtime_FrameStartLine
+func runtime_FrameStartLine(f *runtime.Frame) int
+
+// runtime_FrameSymbolName is defined in runtime/symtab.go.
+//
+//go:noescape
+//go:linkname runtime_FrameSymbolName runtime/pprof.runtime_FrameSymbolName
+func runtime_FrameSymbolName(f *runtime.Frame) string
+
+//go:linkname runtime_expandFinalInlineFrame runtime/pprof.runtime_expandFinalInlineFrame
+func runtime_expandFinalInlineFrame(stk []uintptr) []uintptr
+
+//go:linkname runtime_cyclesPerSecond runtime/pprof.runtime_cyclesPerSecond
+func runtime_cyclesPerSecond() int64
diff --git a/godeltaprof/internal/pprof/stub_go21.go b/godeltaprof/internal/pprof/stub_go23.go
similarity index 61%
rename from godeltaprof/internal/pprof/stub_go21.go
rename to godeltaprof/internal/pprof/stub_go23.go
index 178ce25..37ccbe8 100644
--- a/godeltaprof/internal/pprof/stub_go21.go
+++ b/godeltaprof/internal/pprof/stub_go23.go
@@ -1,5 +1,5 @@
-//go:build go1.21
-// +build go1.21
+//go:build go1.23
+// +build go1.23
 
 package pprof
 
@@ -19,3 +19,9 @@ func runtime_FrameStartLine(f *runtime.Frame) int
 //go:noescape
 //go:linkname runtime_FrameSymbolName runtime/pprof.runtime_FrameSymbolName
 func runtime_FrameSymbolName(f *runtime.Frame) string
+
+//go:linkname runtime_expandFinalInlineFrame runtime/pprof.runtime_expandFinalInlineFrame
+func runtime_expandFinalInlineFrame(stk []uintptr) []uintptr
+
+//go:linkname runtime_cyclesPerSecond runtime.pprof_cyclesPerSecond
+func runtime_cyclesPerSecond() int64