diff --git a/.travis.yml b/.travis.yml
index c0eff516a..dff5349ca 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,7 +7,6 @@ addons:
 language: go
 
 go:
-  - 1.8.x
   - 1.9
 
 # first part of the GOARCH workaround
diff --git a/Changelog.md b/Changelog.md
index bb8559cfb..dbb37a7fd 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -15,5 +15,5 @@
 - Changed the log level environment variable to only accept strings ("DEBUG", "INFO", "ERROR"), see [the wiki](https://github.com/lucas-clemente/quic-go/wiki/Logging) for more details.
 - Rename the `h2quic.QuicRoundTripper` to `h2quic.RoundTripper`
 - Changed `h2quic.Server.Serve()` to accept a `net.PacketConn`
-- Drop support for Go 1.7.
+- Drop support for Go 1.7 and 1.8.
 - Various bugfixes
diff --git a/README.md b/README.md
index 6f3a11e5f..760f470c2 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ As Google's QUIC versions are expected to converge towards the [IETF QUIC draft]
 
 ## Guides
 
-We currently support Go 1.8+.
+We currently support Go 1.9+.
 
 Installing and updating dependencies:
 
diff --git a/interface.go b/interface.go
index a2078d439..a44471cc2 100644
--- a/interface.go
+++ b/interface.go
@@ -9,6 +9,15 @@ import (
 	"github.com/lucas-clemente/quic-go/internal/protocol"
 )
 
+// The StreamID is the ID of a QUIC stream.
+type StreamID = protocol.StreamID
+
+// A ByteCount is a number of bytes.
+type ByteCount = protocol.ByteCount
+
+// A VersionNumber is a QUIC version number.
+type VersionNumber = protocol.VersionNumber
+
 // Stream is the interface implemented by QUIC streams
 type Stream interface {
 	// Read reads data from the stream.
@@ -20,7 +29,7 @@ type Stream interface {
 	// after a fixed time limit; see SetDeadline and SetWriteDeadline.
 	io.Writer
 	io.Closer
-	StreamID() protocol.StreamID
+	StreamID() StreamID
 	// Reset closes the stream with an error.
 	Reset(error)
 	// The context is canceled as soon as the write-side of the stream is closed.
@@ -91,7 +100,7 @@ type Config struct {
 	// The QUIC versions that can be negotiated.
 	// If not set, it uses all versions available.
 	// Warning: This API should not be considered stable and will change soon.
-	Versions []protocol.VersionNumber
+	Versions []VersionNumber
 	// Ask the server to truncate the connection ID sent in the Public Header.
 	// This saves 8 bytes in the Public Header in every packet. However, if the IP address of the server changes, the connection cannot be migrated.
 	// Currently only valid for the client.
@@ -112,10 +121,10 @@ type Config struct {
 	AcceptSTK func(clientAddr net.Addr, stk *STK) bool
 	// MaxReceiveStreamFlowControlWindow is the maximum stream-level flow control window for receiving data.
 	// If this value is zero, it will default to 1 MB for the server and 6 MB for the client.
-	MaxReceiveStreamFlowControlWindow protocol.ByteCount
+	MaxReceiveStreamFlowControlWindow ByteCount
 	// MaxReceiveConnectionFlowControlWindow is the connection-level flow control window for receiving data.
 	// If this value is zero, it will default to 1.5 MB for the server and 15 MB for the client.
-	MaxReceiveConnectionFlowControlWindow protocol.ByteCount
+	MaxReceiveConnectionFlowControlWindow ByteCount
 	// KeepAlive defines whether this peer will periodically send PING frames to keep the connection alive.
 	KeepAlive bool
 }