diff --git a/misc/multistream-select/Cargo.toml b/misc/multistream-select/Cargo.toml
index 42e19e28..3a9c3fc3 100644
--- a/misc/multistream-select/Cargo.toml
+++ b/misc/multistream-select/Cargo.toml
@@ -10,7 +10,7 @@ futures = { version = "0.1" }
 log = "0.4"
 smallvec = "0.5"
 tokio-io = "0.1"
-unsigned-varint = { version = "0.1", features = ["codec"] }
+unsigned-varint = { version = "0.2", features = ["codec"] }
 
 [dev-dependencies]
 tokio-current-thread = "0.1"
diff --git a/muxers/mplex/Cargo.toml b/muxers/mplex/Cargo.toml
index fdbce26e..4692f251 100644
--- a/muxers/mplex/Cargo.toml
+++ b/muxers/mplex/Cargo.toml
@@ -13,7 +13,7 @@ log = "0.4"
 parking_lot = "0.6"
 tokio-codec = "0.1"
 tokio-io = "0.1"
-unsigned-varint = { version = "0.1", features = ["codec"] }
+unsigned-varint = { version = "0.2", features = ["codec"] }
 
 [dev-dependencies]
 libp2p-tcp-transport = { path = "../../transports/tcp" }
diff --git a/protocols/floodsub/Cargo.toml b/protocols/floodsub/Cargo.toml
index acd29516..e543b52a 100644
--- a/protocols/floodsub/Cargo.toml
+++ b/protocols/floodsub/Cargo.toml
@@ -18,4 +18,4 @@ protobuf = "2.0.2"
 smallvec = "0.6.0"
 tokio-codec = "0.1"
 tokio-io = "0.1"
-unsigned-varint = { version = "0.1", features = ["codec"] }
+unsigned-varint = { version = "0.2", features = ["codec"] }
diff --git a/protocols/identify/Cargo.toml b/protocols/identify/Cargo.toml
index 4ad2d745..1df3e221 100644
--- a/protocols/identify/Cargo.toml
+++ b/protocols/identify/Cargo.toml
@@ -16,7 +16,7 @@ parking_lot = "0.6"
 protobuf = "2.0.2"
 tokio-codec = "0.1"
 tokio-io = "0.1.0"
-unsigned-varint = { version = "0.1", features = ["codec"] }
+unsigned-varint = { version = "0.2", features = ["codec"] }
 
 [dev-dependencies]
 libp2p-tcp-transport = { path = "../../transports/tcp" }
diff --git a/protocols/kad/Cargo.toml b/protocols/kad/Cargo.toml
index c9914c51..8f38f9ca 100644
--- a/protocols/kad/Cargo.toml
+++ b/protocols/kad/Cargo.toml
@@ -24,7 +24,7 @@ smallvec = "0.5"
 tokio-codec = "0.1"
 tokio-io = "0.1"
 tokio-timer = "0.2.6"
-unsigned-varint = { version = "0.1", features = ["codec"] }
+unsigned-varint = { version = "0.2", features = ["codec"] }
 
 [dev-dependencies]
 libp2p-tcp-transport = { path = "../../transports/tcp" }
diff --git a/transports/relay/Cargo.toml b/transports/relay/Cargo.toml
index 7fb248e6..edecf4cf 100644
--- a/transports/relay/Cargo.toml
+++ b/transports/relay/Cargo.toml
@@ -15,4 +15,4 @@ protobuf = "2.0.2"
 rand = "0.4"
 tokio-codec = "0.1"
 tokio-io = "0.1"
-unsigned-varint = { version = "0.1", features = ["codec"] }
+unsigned-varint = { version = "0.2", features = ["codec"] }