diff --git a/go.mod b/go.mod
index c7f82c28c1b56..fa1ac6d5af3df 100644
--- a/go.mod
+++ b/go.mod
@@ -174,7 +174,7 @@ require (
 	github.com/prometheus-community/pro-bing v0.7.0
 	github.com/prometheus/client_golang v1.23.0
 	github.com/prometheus/client_model v0.6.2
-	github.com/prometheus/common v0.65.0
+	github.com/prometheus/common v0.66.1
 	github.com/prometheus/procfs v0.17.0
 	github.com/prometheus/prometheus v0.54.1
 	github.com/rabbitmq/amqp091-go v1.10.0
diff --git a/go.sum b/go.sum
index 9e6cfdb189ac5..f10cfb9317450 100644
--- a/go.sum
+++ b/go.sum
@@ -2169,8 +2169,8 @@ github.com/prometheus/common v0.0.0-20181113130724-41aa239b4cce/go.mod h1:daVV7q
 github.com/prometheus/common v0.4.0/go.mod h1:TNfzLD0ON7rHzMJeJkieUDPYmFC7Snx/y86RQel1bk4=
 github.com/prometheus/common v0.4.1/go.mod h1:TNfzLD0ON7rHzMJeJkieUDPYmFC7Snx/y86RQel1bk4=
 github.com/prometheus/common v0.9.1/go.mod h1:yhUN8i9wzaXS3w1O07YhxHEBxD+W35wd8bs7vj7HSQ4=
-github.com/prometheus/common v0.65.0 h1:QDwzd+G1twt//Kwj/Ww6E9FQq1iVMmODnILtW1t2VzE=
-github.com/prometheus/common v0.65.0/go.mod h1:0gZns+BLRQ3V6NdaerOhMbwwRbNh9hkGINtQAsP5GS8=
+github.com/prometheus/common v0.66.1 h1:h5E0h5/Y8niHc5DlaLlWLArTQI7tMrsfQjHV+d9ZoGs=
+github.com/prometheus/common v0.66.1/go.mod h1:gcaUsgf3KfRSwHY4dIMXLPV0K/Wg1oZ8+SbZk/HH/dA=
 github.com/prometheus/procfs v0.0.0-20181005140218-185b4288413d/go.mod h1:c3At6R/oaqEKCNdg8wHV1ftS6bRYblBhIjjI8uT2IGk=
 github.com/prometheus/procfs v0.0.0-20190507164030-5867b95ac084/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
 github.com/prometheus/procfs v0.0.2/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
diff --git a/plugins/parsers/prometheus/parser.go b/plugins/parsers/prometheus/parser.go
index e2d5a937c675f..e378db644e858 100644
--- a/plugins/parsers/prometheus/parser.go
+++ b/plugins/parsers/prometheus/parser.go
@@ -33,7 +33,7 @@ func (p *Parser) SetDefaultTags(tags map[string]string) {
 func (p *Parser) Parse(data []byte) ([]telegraf.Metric, error) {
 	// Determine the metric transport-type derived from the response header and
 	// create a matching decoder.
-	format := expfmt.NewFormat(expfmt.TypeProtoCompact)
+	format := expfmt.NewFormat(expfmt.TypeTextPlain)
 	if len(p.Header) > 0 {
 		format = expfmt.ResponseFormat(p.Header)
 		switch format.FormatType() {
@@ -43,6 +43,11 @@ func (p *Parser) Parse(data []byte) ([]telegraf.Metric, error) {
 			if !bytes.HasSuffix(data, []byte("\n")) {
 				data = append(data, []byte("\n")...)
 			}
+			fallthrough
+		case expfmt.TypeProtoCompact:
+			// As of prometheus common 0.66.0, ProtoText and ProtoCompact are disallowed from the decoder. Before this
+			// version, it used to fall back to TextPlain, so we do that here instead to mimic the old behavior.
+			format = expfmt.NewFormat(expfmt.TypeTextPlain)
 		case expfmt.TypeUnknown:
 			p.Log.Debugf("Unknown format %q... Trying to continue...", p.Header.Get("Content-Type"))
 		}
diff --git a/plugins/serializers/prometheus/convert.go b/plugins/serializers/prometheus/convert.go
index a1d7fc4d97de9..62019f5dbf30d 100644
--- a/plugins/serializers/prometheus/convert.go
+++ b/plugins/serializers/prometheus/convert.go
@@ -86,7 +86,7 @@ func sanitize(name string, table table) (string, bool) {
 // SanitizeMetricName checks if the name is a valid Prometheus metric name.
 // If not, it attempts to replace invalid runes with an underscore to create a valid name.
 func SanitizeMetricName(name string) (string, bool) {
-	if model.IsValidLegacyMetricName(name) {
+	if model.LegacyValidation.IsValidMetricName(name) {
 		return name, true
 	}
 	return sanitize(name, metricNameTable)
@@ -95,7 +95,7 @@ func SanitizeMetricName(name string) (string, bool) {
 // SanitizeLabelName checks if the name is a valid Prometheus label name.
 // If not, it attempts to replace invalid runes with an underscore to create a valid name.
 func SanitizeLabelName(name string) (string, bool) {
-	if model.LabelName(name).IsValidLegacy() {
+	if model.LegacyValidation.IsValidLabelName(name) {
 		return name, true
 	}
 	return sanitize(name, labelNameTable)