diff --git a/llvm/tools/llvm-reduce/llvm-reduce.cpp b/llvm/tools/llvm-reduce/llvm-reduce.cpp
index 4d338f4eb282b8..c7606b5fef9e4a 100644
--- a/llvm/tools/llvm-reduce/llvm-reduce.cpp
+++ b/llvm/tools/llvm-reduce/llvm-reduce.cpp
@@ -17,27 +17,19 @@
 #include "DeltaManager.h"
 #include "ReducerWorkItem.h"
 #include "TestRunner.h"
-#include "llvm/Analysis/ProfileSummaryInfo.h"
 #include "llvm/Analysis/ModuleSummaryAnalysis.h"
-#include "llvm/ADT/SmallString.h"
+#include "llvm/Analysis/ProfileSummaryInfo.h"
 #include "llvm/Bitcode/BitcodeReader.h"
 #include "llvm/Bitcode/BitcodeWriter.h"
 #include "llvm/CodeGen/CommandFlags.h"
-#include "llvm/CodeGen/MachineFunction.h"
-#include "llvm/CodeGen/MachineModuleInfo.h"
-#include "llvm/IR/LegacyPassManager.h"
 #include "llvm/IR/LLVMContext.h"
-#include "llvm/IR/Verifier.h"
 #include "llvm/IRReader/IRReader.h"
-#include "llvm/MC/TargetRegistry.h"
+#include "llvm/Passes/PassBuilder.h"
 #include "llvm/Support/CommandLine.h"
-#include "llvm/Support/Host.h"
 #include "llvm/Support/InitLLVM.h"
-#include "llvm/Support/SourceMgr.h"
-#include "llvm/Support/TargetSelect.h"
 #include "llvm/Support/WithColor.h"
 #include "llvm/Support/raw_ostream.h"
-#include "llvm/Transforms/IPO.h"
+#include "llvm/Transforms/IPO/ThinLTOBitcodeWriter.h"
 #include <system_error>
 #include <vector>
 
@@ -117,9 +109,19 @@ void writeOutput(ReducerWorkItem &M, StringRef Message) {
 
 void writeBitcode(ReducerWorkItem &M, llvm::raw_ostream &OutStream) {
   if (M.LTOInfo && M.LTOInfo->IsThinLTO && M.LTOInfo->EnableSplitLTOUnit) {
-    legacy::PassManager PM;
-    PM.add(llvm::createWriteThinLTOBitcodePass(OutStream));
-    PM.run(*(M.M));
+    PassBuilder PB;
+    LoopAnalysisManager LAM;
+    FunctionAnalysisManager FAM;
+    CGSCCAnalysisManager CGAM;
+    ModuleAnalysisManager MAM;
+    PB.registerModuleAnalyses(MAM);
+    PB.registerCGSCCAnalyses(CGAM);
+    PB.registerFunctionAnalyses(FAM);
+    PB.registerLoopAnalyses(LAM);
+    PB.crossRegisterProxies(LAM, FAM, CGAM, MAM);
+    ModulePassManager MPM;
+    MPM.addPass(ThinLTOBitcodeWriterPass(OutStream, nullptr));
+    MPM.run(*M.M, MAM);
   } else {
     std::unique_ptr<ModuleSummaryIndex> Index;
     if (M.LTOInfo && M.LTOInfo->HasSummary) {