diff --git a/common/version/version.go b/common/version/version.go
index b3f1ccd72c..95f6e96691 100644
--- a/common/version/version.go
+++ b/common/version/version.go
@@ -5,7 +5,7 @@ import (
 	"runtime/debug"
 )
 
-var tag = "v4.5.0"
+var tag = "v4.5.1"
 
 var commit = func() string {
 	if info, ok := debug.ReadBuildInfo(); ok {
diff --git a/coordinator/internal/logic/auth/login.go b/coordinator/internal/logic/auth/login.go
index b8d1bf4775..f5b1e68720 100644
--- a/coordinator/internal/logic/auth/login.go
+++ b/coordinator/internal/logic/auth/login.go
@@ -139,6 +139,12 @@ func (l *LoginLogic) ProverHardForkName(login *types.LoginParameter) (string, er
 	}
 
 	proverVersion := proverVersionSplits[0]
+
+	// allowing darwin provers to login, because darwin provers can prove darwinV2 chunk tasks
+	if proverVersion == "v4.4.56" {
+		return "darwin", nil
+	}
+
 	if hardForkNames, ok := l.proverVersionHardForkMap[proverVersion]; ok {
 		return strings.Join(hardForkNames, ","), nil
 	}
diff --git a/coordinator/internal/logic/provertask/prover_task.go b/coordinator/internal/logic/provertask/prover_task.go
index 1c4f2fd3e6..c1815e8a3e 100644
--- a/coordinator/internal/logic/provertask/prover_task.go
+++ b/coordinator/internal/logic/provertask/prover_task.go
@@ -121,6 +121,11 @@ func (b *BaseProverTask) hardForkSanityCheck(ctx *gin.Context, taskCtx *proverTa
 		return "", getHardForkErr
 	}
 
+	// for backward compatibility, darwin chunk prover can still prove darwinV2 chunk tasks
+	if taskCtx.taskType == message.ProofTypeChunk && hardForkName == "darwinV2" && taskCtx.ProverVersion == "v4.4.56" {
+		return hardForkName, nil
+	}
+
 	if _, ok := taskCtx.HardForkNames[hardForkName]; !ok {
 		return "", fmt.Errorf("to be assigned prover task's hard-fork name is not the same as prover, proverName: %s, proverVersion: %s, proverSupportHardForkNames: %s, taskHardForkName: %v", taskCtx.ProverName, taskCtx.ProverVersion, taskCtx.HardForkNames, hardForkName)
 	}