diff --git a/go.mod b/go.mod
index 44004f217..1d1fb24a3 100644
--- a/go.mod
+++ b/go.mod
@@ -8,7 +8,7 @@ require (
 	// like https://github.com/valyala/fasthttp/commit/996610f021ff45fdc98c2ce7884d5fa4e7f9199b
 	github.com/VictoriaMetrics/fasthttp v1.0.5
 	github.com/VictoriaMetrics/metrics v1.12.3
-	github.com/VictoriaMetrics/metricsql v0.4.3
+	github.com/VictoriaMetrics/metricsql v0.5.1
 	github.com/aws/aws-sdk-go v1.34.14
 	github.com/cespare/xxhash/v2 v2.1.1
 	github.com/golang/snappy v0.0.1
diff --git a/go.sum b/go.sum
index f7e60a188..8ba667348 100644
--- a/go.sum
+++ b/go.sum
@@ -58,8 +58,8 @@ github.com/VictoriaMetrics/metrics v1.12.2 h1:SG8iAmqavDNuh7GIdHPoGHUhDL23KeKfvS
 github.com/VictoriaMetrics/metrics v1.12.2/go.mod h1:Z1tSfPfngDn12bTfZSCqArT3OPY3u88J12hSoOhuiRE=
 github.com/VictoriaMetrics/metrics v1.12.3 h1:Fe6JHC6MSEKa+BtLhPN8WIvS+HKPzMc2evEpNeCGy7I=
 github.com/VictoriaMetrics/metrics v1.12.3/go.mod h1:Z1tSfPfngDn12bTfZSCqArT3OPY3u88J12hSoOhuiRE=
-github.com/VictoriaMetrics/metricsql v0.4.3 h1:4lezcOTMeGOfGtrf+I2YEC98lkx4nRczTiLrL+6E3CE=
-github.com/VictoriaMetrics/metricsql v0.4.3/go.mod h1:ylO7YITho/Iw6P71oEaGyHbO94bGoGtzWfLGqFhMIg8=
+github.com/VictoriaMetrics/metricsql v0.5.1 h1:hG6Nck7R2/amLgHECobSTXsjZ2z9JP5J3W1sYlBoqfU=
+github.com/VictoriaMetrics/metricsql v0.5.1/go.mod h1:ylO7YITho/Iw6P71oEaGyHbO94bGoGtzWfLGqFhMIg8=
 github.com/allegro/bigcache v1.2.1-0.20190218064605-e24eb225f156 h1:eMwmnE/GDgah4HI848JfFxHt+iPb26b4zyfspmqY0/8=
 github.com/allegro/bigcache v1.2.1-0.20190218064605-e24eb225f156/go.mod h1:Cb/ax3seSYIx7SuZdm2G2xzfwmv3TPSk2ucNfQESPXM=
 github.com/andybalholm/brotli v1.0.0/go.mod h1:loMXtMfwqflxFJPmdbJO0a3KNoPuLBgiu3qAvBg8x/Y=
diff --git a/vendor/github.com/VictoriaMetrics/metricsql/binary_op.go b/vendor/github.com/VictoriaMetrics/metricsql/binary_op.go
index 1e7d8be53..a265af00b 100644
--- a/vendor/github.com/VictoriaMetrics/metricsql/binary_op.go
+++ b/vendor/github.com/VictoriaMetrics/metricsql/binary_op.go
@@ -139,7 +139,7 @@ func isBinaryOpLogicalSet(op string) bool {
 	}
 }
 
-func binaryOpEval(op string, left, right float64, isBool bool) float64 {
+func binaryOpEvalNumber(op string, left, right float64, isBool bool) float64 {
 	if IsBinaryOpCmp(op) {
 		evalCmp := func(cf func(left, right float64) bool) float64 {
 			if isBool {
diff --git a/vendor/github.com/VictoriaMetrics/metricsql/parser.go b/vendor/github.com/VictoriaMetrics/metricsql/parser.go
index 212a5f5d4..e2934e57d 100644
--- a/vendor/github.com/VictoriaMetrics/metricsql/parser.go
+++ b/vendor/github.com/VictoriaMetrics/metricsql/parser.go
@@ -169,19 +169,58 @@ func simplifyConstants(e Expr) Expr {
 	be.Left = simplifyConstants(be.Left)
 	be.Right = simplifyConstants(be.Right)
 
-	lne, ok := be.Left.(*NumberExpr)
-	if !ok {
+	lne, lok := be.Left.(*NumberExpr)
+	rne, rok := be.Right.(*NumberExpr)
+	if lok && rok {
+		n := binaryOpEvalNumber(be.Op, lne.N, rne.N, be.Bool)
+		return &NumberExpr{
+			N: n,
+		}
+	}
+
+	// Check whether both operands are string literals.
+	lse, lok := be.Left.(*StringExpr)
+	rse, rok := be.Right.(*StringExpr)
+	if !lok || !rok {
 		return be
 	}
-	rne, ok := be.Right.(*NumberExpr)
-	if !ok {
+	if be.Op == "+" {
+		// convert "foo" + "bar" to "foobar".
+		return &StringExpr{
+			S: lse.S + rse.S,
+		}
+	}
+	if !IsBinaryOpCmp(be.Op) {
 		return be
 	}
-	n := binaryOpEval(be.Op, lne.N, rne.N, be.Bool)
-	ne := &NumberExpr{
+	// Perform string comparisons.
+	ok = false
+	switch be.Op {
+	case "==":
+		ok = lse.S == rse.S
+	case "!=":
+		ok = lse.S != rse.S
+	case ">":
+		ok = lse.S > rse.S
+	case "<":
+		ok = lse.S < rse.S
+	case ">=":
+		ok = lse.S >= rse.S
+	case "<=":
+		ok = lse.S <= rse.S
+	default:
+		panic(fmt.Errorf("BUG: unexpected comparison binaryOp: %q", be.Op))
+	}
+	n := float64(0)
+	if ok {
+		n = 1
+	}
+	if !be.Bool && n == 0 {
+		n = nan
+	}
+	return &NumberExpr{
 		N: n,
 	}
-	return ne
 }
 
 func simplifyConstantsInplace(args []Expr) {
diff --git a/vendor/modules.txt b/vendor/modules.txt
index f60906505..5e7d0c6a2 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -16,7 +16,7 @@ github.com/VictoriaMetrics/fasthttp/fasthttputil
 github.com/VictoriaMetrics/fasthttp/stackless
 # github.com/VictoriaMetrics/metrics v1.12.3
 github.com/VictoriaMetrics/metrics
-# github.com/VictoriaMetrics/metricsql v0.4.3
+# github.com/VictoriaMetrics/metricsql v0.5.1
 github.com/VictoriaMetrics/metricsql
 github.com/VictoriaMetrics/metricsql/binaryop
 # github.com/aws/aws-sdk-go v1.34.14