diff --git a/crypt.go b/crypt.go
index e90f8a4..71a9b80 100644
--- a/crypt.go
+++ b/crypt.go
@@ -37,26 +37,20 @@ func encrypt(args []string) {
 	var keyfile string
 	var envpw string
 	var nopw bool
-	var sblksize string
+	var blksize uint64
 
 	fs.StringVarP(&outfile, "outfile", "o", "", "Write the output to file `F`")
 	fs.StringVarP(&keyfile, "sign", "s", "", "Sign using private key `S`")
 	fs.BoolVarP(&nopw, "no-password", "", false, "Don't ask for passphrase to decrypt the private key")
 	fs.StringVarP(&envpw, "env-password", "", "", "Use passphrase from environment variable `E`")
-	fs.StringVarP(&sblksize, "block-size", "B", "4M", "Use `S` as the encryption block size")
+	fs.SizeVarP(&blksize, "block-size", "B", 128 * 1024, "Use `S` as the encryption block size")
 
 	err := fs.Parse(args)
 	if err != nil {
 		die("%s", err)
 	}
 
-	blksize, err := utils.ParseSize(sblksize)
-	if err != nil {
-		die("%s", err)
-	}
-
 	var pws, infile string
-
 	var sk *sign.PrivateKey
 
 	if len(keyfile) > 0 {
diff --git a/go.mod b/go.mod
index 3a8fbf0..1fddf1e 100644
--- a/go.mod
+++ b/go.mod
@@ -5,8 +5,8 @@ go 1.13
 require (
 	github.com/dchest/bcrypt_pbkdf v0.0.0-20150205184540-83f37f9c154a
 	github.com/gogo/protobuf v1.3.1
-	github.com/opencoff/go-utils v0.4.0
-	github.com/opencoff/pflag v0.4.0
+	github.com/opencoff/go-utils v0.4.1
+	github.com/opencoff/pflag v0.5.0
 	golang.org/x/crypto v0.0.0-20191002192127-34f69633bfdc
 	gopkg.in/yaml.v2 v2.2.4
 )
diff --git a/go.sum b/go.sum
index 99f1cd2..c3fc986 100644
--- a/go.sum
+++ b/go.sum
@@ -8,10 +8,16 @@ github.com/opencoff/go-utils v0.3.0 h1:/TQXjf50o3GSB9MItog5L8Gf4GWJ4B5+rmqjB4g2R
 github.com/opencoff/go-utils v0.3.0/go.mod h1:c+7QUAiCCHcNH6OGvsZ0fviG7cgse8Y3ucg+xy7sGXM=
 github.com/opencoff/go-utils v0.4.0 h1:pu08Om//u2+YGvLkHa2CyL6eI+/1J0bXih1Z6nuITp8=
 github.com/opencoff/go-utils v0.4.0/go.mod h1:c+7QUAiCCHcNH6OGvsZ0fviG7cgse8Y3ucg+xy7sGXM=
+github.com/opencoff/go-utils v0.4.1 h1:Ke4Q1Tl2GKMI+dwleuPNHH713ngRiNMOFIkymncHqXg=
+github.com/opencoff/go-utils v0.4.1/go.mod h1:c+7QUAiCCHcNH6OGvsZ0fviG7cgse8Y3ucg+xy7sGXM=
 github.com/opencoff/pflag v0.3.3 h1:yohZkwYGPkB34WXvUQzU5GyLhImnjfePDARUaE8me3U=
 github.com/opencoff/pflag v0.3.3/go.mod h1:mTLzGGUGda1Av3d34iAJlh0JIlRxmFZtmc6qoWPspK0=
 github.com/opencoff/pflag v0.4.0 h1:Y+okQXIvgnGplXlKqqm0uWKQ0KaZLlvSBb4ChQ/3vFw=
 github.com/opencoff/pflag v0.4.0/go.mod h1:mTLzGGUGda1Av3d34iAJlh0JIlRxmFZtmc6qoWPspK0=
+github.com/opencoff/pflag v0.4.1 h1:kORIcgXprp9zY60yeHqBUnz9Z/mLWzkcESzya0beJ2Y=
+github.com/opencoff/pflag v0.4.1/go.mod h1:mTLzGGUGda1Av3d34iAJlh0JIlRxmFZtmc6qoWPspK0=
+github.com/opencoff/pflag v0.5.0 h1:kK3cSTlGj0fHby/PoFzHkf+Jx3PdiACJwzYDWEWlEKQ=
+github.com/opencoff/pflag v0.5.0/go.mod h1:mTLzGGUGda1Av3d34iAJlh0JIlRxmFZtmc6qoWPspK0=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20190618222545-ea8f1a30c443/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20191002192127-34f69633bfdc h1:c0o/qxkaO2LF5t6fQrT4b5hzyggAkLLlCUjqfRxd8Q4=
diff --git a/version b/version
index a918a2a..ee6cdce 100644
--- a/version
+++ b/version
@@ -1 +1 @@
-0.6.0
+0.6.1