diff --git a/CHANGELOG.md b/CHANGELOG.md
index 675057ec..8eff0f40 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,14 @@
 * [ENHANCEMENT]
 * [BUGFIX]
 
+* [ENHANCEMENT] Add node_softirqs_total metric #2221
+
+## 1.3.1 / 2021-12-01
+
+* [BUGFIX] Handle nil CPU thermal power status on M1 #2218
+* [BUGFIX] bsd: Ignore filesystems flagged as MNT_IGNORE. #2227
+* [BUGFIX] Sanitize UTF-8 in dmi collector #2229
+
 ## 1.3.0 / 2021-10-20
 
 NOTE: In order to support globs in the textfile collector path, filenames exposed by
diff --git a/VERSION b/VERSION
index f0bb29e7..3a3cd8cc 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.3.0
+1.3.1
diff --git a/collector/dmi.go b/collector/dmi.go
index 3cc2a8a5..79475507 100644
--- a/collector/dmi.go
+++ b/collector/dmi.go
@@ -20,6 +20,7 @@ import (
 	"errors"
 	"fmt"
 	"os"
+	"strings"
 
 	"github.com/go-kit/log"
 	"github.com/go-kit/log/level"
@@ -78,7 +79,7 @@ func NewDMICollector(logger log.Logger) (Collector, error) {
 	} {
 		if value != nil {
 			labels = append(labels, label)
-			values = append(values, *value)
+			values = append(values, strings.ToValidUTF8(*value, "�"))
 		}
 	}
 
diff --git a/collector/filesystem_freebsd.go b/collector/filesystem_freebsd.go
index 768eb797..25ba20a4 100644
--- a/collector/filesystem_freebsd.go
+++ b/collector/filesystem_freebsd.go
@@ -24,18 +24,16 @@ import (
 const (
 	defMountPointsExcluded = "^/(dev)($|/)"
 	defFSTypesExcluded     = "^devfs$"
-	readOnly               = 0x1 // MNT_RDONLY
-	noWait                 = 0x2 // MNT_NOWAIT
 )
 
 // Expose filesystem fullness.
 func (c *filesystemCollector) GetStats() ([]filesystemStats, error) {
-	n, err := unix.Getfsstat(nil, noWait)
+	n, err := unix.Getfsstat(nil, unix.MNT_NOWAIT)
 	if err != nil {
 		return nil, err
 	}
 	buf := make([]unix.Statfs_t, n)
-	_, err = unix.Getfsstat(buf, noWait)
+	_, err = unix.Getfsstat(buf, unix.MNT_NOWAIT)
 	if err != nil {
 		return nil, err
 	}
@@ -54,8 +52,13 @@ func (c *filesystemCollector) GetStats() ([]filesystemStats, error) {
 			continue
 		}
 
+		if (fs.Flags & unix.MNT_IGNORE) != 0 {
+			level.Debug(c.logger).Log("msg", "Ignoring mount flagged as ignore", "mountpoint", mountpoint)
+			continue
+		}
+
 		var ro float64
-		if (fs.Flags & readOnly) != 0 {
+		if (fs.Flags & unix.MNT_RDONLY) != 0 {
 			ro = 1
 		}
 
diff --git a/collector/fixtures/e2e-output.txt b/collector/fixtures/e2e-output.txt
index 779eb3b6..4a61538c 100644
--- a/collector/fixtures/e2e-output.txt
+++ b/collector/fixtures/e2e-output.txt
@@ -609,7 +609,7 @@ node_disk_written_bytes_total{device="sr0"} 0
 node_disk_written_bytes_total{device="vda"} 1.0938236928e+11
 # HELP node_dmi_info A metric with a constant '1' value labeled by bios_date, bios_release, bios_vendor, bios_version, board_asset_tag, board_name, board_serial, board_vendor, board_version, chassis_asset_tag, chassis_serial, chassis_vendor, chassis_version, product_family, product_name, product_serial, product_sku, product_uuid, product_version, system_vendor if provided by DMI.
 # TYPE node_dmi_info gauge
-node_dmi_info{bios_date="04/12/2021",bios_release="2.2",bios_vendor="Dell Inc.",bios_version="2.2.4",board_name="07PXPY",board_serial=".7N62AI2.GRTCL6944100GP.",board_vendor="Dell Inc.",board_version="A01",chassis_asset_tag="",chassis_serial="7N62AI2",chassis_vendor="Dell Inc.",chassis_version="",product_family="PowerEdge",product_name="PowerEdge R6515",product_serial="7N62AI2",product_sku="SKU=NotProvided;ModelName=PowerEdge R6515",product_uuid="83340ca8-cb49-4474-8c29-d2088ca84dd9",product_version="",system_vendor="Dell Inc."} 1
+node_dmi_info{bios_date="04/12/2021",bios_release="2.2",bios_vendor="Dell Inc.",bios_version="2.2.4",board_name="07PXPY",board_serial=".7N62AI2.GRTCL6944100GP.",board_vendor="Dell Inc.",board_version="A01",chassis_asset_tag="",chassis_serial="7N62AI2",chassis_vendor="Dell Inc.",chassis_version="",product_family="PowerEdge",product_name="PowerEdge R6515",product_serial="7N62AI2",product_sku="SKU=NotProvided;ModelName=PowerEdge R6515",product_uuid="83340ca8-cb49-4474-8c29-d2088ca84dd9",product_version="�[�",system_vendor="Dell Inc."} 1
 # HELP node_drbd_activitylog_writes_total Number of updates of the activity log area of the meta data.
 # TYPE node_drbd_activitylog_writes_total counter
 node_drbd_activitylog_writes_total{device="drbd1"} 1100
diff --git a/collector/fixtures/sys.ttar b/collector/fixtures/sys.ttar
index a08e6b61..72a97b41 100644
--- a/collector/fixtures/sys.ttar
+++ b/collector/fixtures/sys.ttar
@@ -141,7 +141,7 @@ Mode: 400
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Path: sys/class/dmi/id/product_version
 Lines: 1
-
+À[‡
 Mode: 444
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Path: sys/class/dmi/id/sys_vendor
diff --git a/collector/thermal_darwin.go b/collector/thermal_darwin.go
index 282ca3f3..25673dcc 100644
--- a/collector/thermal_darwin.go
+++ b/collector/thermal_darwin.go
@@ -47,9 +47,10 @@ import "C"
 import (
 	"errors"
 	"fmt"
+	"unsafe"
+
 	"github.com/go-kit/log"
 	"github.com/prometheus/client_golang/prometheus"
-	"unsafe"
 )
 
 type thermCollector struct {
@@ -118,7 +119,9 @@ func (c *thermCollector) Update(ch chan<- prometheus.Metric) error {
 func fetchCPUPowerStatus() (map[string]int, error) {
 	cfDictRef, _ := C.FetchThermal()
 	defer func() {
-		C.CFRelease(C.CFTypeRef(cfDictRef.ref))
+		if cfDictRef.ref != 0x0 {
+			C.CFRelease(C.CFTypeRef(cfDictRef.ref))
+		}
 	}()
 
 	if C.kIOReturnNotFound == cfDictRef.ret {
diff --git a/end-to-end-test.sh b/end-to-end-test.sh
index f024890d..0455d763 100755
--- a/end-to-end-test.sh
+++ b/end-to-end-test.sh
@@ -11,6 +11,7 @@ enabled_collectors=$(cat << COLLECTORS
   cpu
   cpufreq
   diskstats
+  dmi
   drbd
   edac
   entropy