diff --git a/vendor/github.com/prometheus/tsdb/index/index.go b/vendor/github.com/prometheus/tsdb/index/index.go
index 146332d10..2689b5691 100644
--- a/vendor/github.com/prometheus/tsdb/index/index.go
+++ b/vendor/github.com/prometheus/tsdb/index/index.go
@@ -144,7 +144,11 @@ func NewWriter(fn string) (*Writer, error) {
 	if err != nil {
 		return nil, err
 	}
-	defer df.Close() // close for flatform windows
+	defer df.Close() // Close for platform windows.
+
+	if err := os.RemoveAll(fn); err != nil {
+		return nil, errors.Wrap(err, "remove any existing index at path")
+	}
 
 	f, err := os.OpenFile(fn, os.O_CREATE|os.O_WRONLY, 0666)
 	if err != nil {
@@ -535,8 +539,8 @@ type Reader struct {
 	c io.Closer
 
 	// Cached hashmaps of section offsets.
-	labels   map[string]uint32
-	postings map[labels.Label]uint32
+	labels   map[string]uint64
+	postings map[labels.Label]uint64
 	// Cache of read symbols. Strings that are returned when reading from the
 	// block are always backed by true strings held in here rather than
 	// strings that are backed by byte slices from the mmap'd index file. This
@@ -597,8 +601,8 @@ func newReader(b ByteSlice, c io.Closer) (*Reader, error) {
 		b:        b,
 		c:        c,
 		symbols:  map[uint32]string{},
-		labels:   map[string]uint32{},
-		postings: map[labels.Label]uint32{},
+		labels:   map[string]uint64{},
+		postings: map[labels.Label]uint64{},
 		crc32:    newCRC32(),
 	}
 
@@ -623,7 +627,7 @@ func newReader(b ByteSlice, c io.Closer) (*Reader, error) {
 	}
 	var err error
 
-	err = r.readOffsetTable(r.toc.labelIndicesTable, func(key []string, off uint32) error {
+	err = r.readOffsetTable(r.toc.labelIndicesTable, func(key []string, off uint64) error {
 		if len(key) != 1 {
 			return errors.Errorf("unexpected key length %d", len(key))
 		}
@@ -633,7 +637,7 @@ func newReader(b ByteSlice, c io.Closer) (*Reader, error) {
 	if err != nil {
 		return nil, errors.Wrap(err, "read label index table")
 	}
-	err = r.readOffsetTable(r.toc.postingsTable, func(key []string, off uint32) error {
+	err = r.readOffsetTable(r.toc.postingsTable, func(key []string, off uint64) error {
 		if len(key) != 2 {
 			return errors.Errorf("unexpected key length %d", len(key))
 		}
@@ -786,7 +790,7 @@ func (r *Reader) readSymbols(off int) error {
 // readOffsetTable reads an offset table at the given position calls f for each
 // found entry.f
 // If f returns an error it stops decoding and returns the received error,
-func (r *Reader) readOffsetTable(off uint64, f func([]string, uint32) error) error {
+func (r *Reader) readOffsetTable(off uint64, f func([]string, uint64) error) error {
 	d := r.decbufAt(int(off))
 	cnt := d.be32()
 
@@ -797,7 +801,7 @@ func (r *Reader) readOffsetTable(off uint64, f func([]string, uint32) error) err
 		for i := 0; i < keyCount; i++ {
 			keys = append(keys, d.uvarintStr())
 		}
-		o := uint32(d.uvarint())
+		o := d.uvarint64()
 		if d.err() != nil {
 			break
 		}
diff --git a/vendor/github.com/prometheus/tsdb/index/postings.go b/vendor/github.com/prometheus/tsdb/index/postings.go
index f942edaad..53449f341 100644
--- a/vendor/github.com/prometheus/tsdb/index/postings.go
+++ b/vendor/github.com/prometheus/tsdb/index/postings.go
@@ -445,32 +445,31 @@ func (rp *removedPostings) Next() bool {
 		rp.rok = rp.remove.Next()
 		rp.initialized = true
 	}
+	for {
+		if !rp.fok {
+			return false
+		}
 
-	if !rp.fok {
-		return false
+		if !rp.rok {
+			rp.cur = rp.full.At()
+			rp.fok = rp.full.Next()
+			return true
+		}
+
+		fcur, rcur := rp.full.At(), rp.remove.At()
+		if fcur < rcur {
+			rp.cur = fcur
+			rp.fok = rp.full.Next()
+
+			return true
+		} else if rcur < fcur {
+			// Forward the remove postings to the right position.
+			rp.rok = rp.remove.Seek(fcur)
+		} else {
+			// Skip the current posting.
+			rp.fok = rp.full.Next()
+		}
 	}
-
-	if !rp.rok {
-		rp.cur = rp.full.At()
-		rp.fok = rp.full.Next()
-		return true
-	}
-
-	fcur, rcur := rp.full.At(), rp.remove.At()
-	if fcur < rcur {
-		rp.cur = fcur
-		rp.fok = rp.full.Next()
-
-		return true
-	} else if rcur < fcur {
-		// Forward the remove postings to the right position.
-		rp.rok = rp.remove.Seek(fcur)
-	} else {
-		// Skip the current posting.
-		rp.fok = rp.full.Next()
-	}
-
-	return rp.Next()
 }
 
 func (rp *removedPostings) Seek(id uint64) bool {
diff --git a/vendor/vendor.json b/vendor/vendor.json
index cbddd6560..5a7d4afc3 100644
--- a/vendor/vendor.json
+++ b/vendor/vendor.json
@@ -802,38 +802,38 @@
 		{
 			"checksumSHA1": "CeD8QwiLL5CBkWMOfbaJxs4AFuM=",
 			"path": "github.com/prometheus/tsdb",
-			"revision": "bc49a665d16326ad6ad078b97e0f903d894f80f8",
-			"revisionTime": "2018-02-12T10:58:46Z"
+			"revision": "494acd307058387ced7646f9996b0f7372eaa558",
+			"revisionTime": "2018-02-15T11:29:47Z"
 		},
 		{
-			"checksumSHA1": "4X26TfLh8M4WuCFo/5a+Qk+ieSw=",
+			"checksumSHA1": "S7F4yWxVLhxQNHMdgoOo6plmOOs=",
 			"path": "github.com/prometheus/tsdb/chunkenc",
-			"revision": "bc49a665d16326ad6ad078b97e0f903d894f80f8",
-			"revisionTime": "2018-02-12T10:58:46Z"
+			"revision": "494acd307058387ced7646f9996b0f7372eaa558",
+			"revisionTime": "2018-02-15T11:29:47Z"
 		},
 		{
 			"checksumSHA1": "+zsn1i8cqwgZXL8Bg6jDy32xjAo=",
 			"path": "github.com/prometheus/tsdb/chunks",
-			"revision": "bc49a665d16326ad6ad078b97e0f903d894f80f8",
-			"revisionTime": "2018-02-12T10:58:46Z"
+			"revision": "494acd307058387ced7646f9996b0f7372eaa558",
+			"revisionTime": "2018-02-15T11:29:47Z"
 		},
 		{
 			"checksumSHA1": "h49AAcJ5+iRBwCgbfQf+2T1E1ZE=",
 			"path": "github.com/prometheus/tsdb/fileutil",
-			"revision": "bc49a665d16326ad6ad078b97e0f903d894f80f8",
-			"revisionTime": "2018-02-12T10:58:46Z"
+			"revision": "494acd307058387ced7646f9996b0f7372eaa558",
+			"revisionTime": "2018-02-15T11:29:47Z"
 		},
 		{
-			"checksumSHA1": "Cpumd1FEx22Kz8I3HrhMPrSRPNA=",
+			"checksumSHA1": "UlvN+ZhTu52S8f9niySQpPC+dvQ=",
 			"path": "github.com/prometheus/tsdb/index",
-			"revision": "bc49a665d16326ad6ad078b97e0f903d894f80f8",
-			"revisionTime": "2018-02-12T10:58:46Z"
+			"revision": "494acd307058387ced7646f9996b0f7372eaa558",
+			"revisionTime": "2018-02-15T11:29:47Z"
 		},
 		{
 			"checksumSHA1": "Va8HWvOFTwFeewZFadMAOzNGDps=",
 			"path": "github.com/prometheus/tsdb/labels",
-			"revision": "bc49a665d16326ad6ad078b97e0f903d894f80f8",
-			"revisionTime": "2018-02-12T10:58:46Z"
+			"revision": "494acd307058387ced7646f9996b0f7372eaa558",
+			"revisionTime": "2018-02-15T11:29:47Z"
 		},
 		{
 			"checksumSHA1": "5SYLEhADhdBVZAGPVHWggQl7H8k=",