diff --git a/components/devtools/Cargo.toml b/components/devtools/Cargo.toml
index 3ac74d737cf..4b4290d3c74 100644
--- a/components/devtools/Cargo.toml
+++ b/components/devtools/Cargo.toml
@@ -10,7 +10,7 @@ path = "lib.rs"
 
 [dependencies]
 devtools_traits = {path = "../devtools_traits"}
-hyper = { version = "0.9", features = [ "serde-serialization" ] }
+hyper = { version = "0.9.9", features = [ "serde-serialization" ] }
 ipc-channel = {git = "https://github.com/servo/ipc-channel"}
 log = "0.3.5"
 msg = {path = "../msg"}
diff --git a/components/devtools_traits/Cargo.toml b/components/devtools_traits/Cargo.toml
index 2acf5dbb697..6150f349c5a 100644
--- a/components/devtools_traits/Cargo.toml
+++ b/components/devtools_traits/Cargo.toml
@@ -12,7 +12,7 @@ path = "lib.rs"
 bitflags = "0.7"
 heapsize = "0.3.0"
 heapsize_plugin = "0.1.2"
-hyper = {version = "0.9", features = ["serde-serialization"]}
+hyper = {version = "0.9.9", features = ["serde-serialization"]}
 ipc-channel = {git = "https://github.com/servo/ipc-channel"}
 msg = {path = "../msg"}
 serde = "0.7.11"
diff --git a/components/msg/Cargo.toml b/components/msg/Cargo.toml
index b1b88c5da4d..86185814757 100644
--- a/components/msg/Cargo.toml
+++ b/components/msg/Cargo.toml
@@ -15,7 +15,7 @@ cssparser = {version = "0.5.4", features = ["heap_size", "serde-serialization"]}
 euclid = "0.7.1"
 heapsize = "0.3.0"
 heapsize_plugin = "0.1.2"
-hyper = {version = "0.9", features = ["serde-serialization"]}
+hyper = {version = "0.9.9", features = ["serde-serialization"]}
 ipc-channel = {git = "https://github.com/servo/ipc-channel"}
 layers = {git = "https://github.com/servo/rust-layers", features = ["plugins"]}
 plugins = {path = "../plugins"}
diff --git a/components/net/Cargo.toml b/components/net/Cargo.toml
index 44710e096b9..8ee59cfb98e 100644
--- a/components/net/Cargo.toml
+++ b/components/net/Cargo.toml
@@ -16,7 +16,7 @@ cookie = { version = "0.2.5", features = ["serialize-serde", "serialize-rustc" ]
 device = {git = "https://github.com/servo/devices"}
 devtools_traits = {path = "../devtools_traits"}
 flate2 = "0.2.0"
-hyper = {version = "0.9", features = ["serde-serialization"]}
+hyper = {version = "0.9.9", features = ["serde-serialization"]}
 immeta = "0.3.1"
 ipc-channel = {git = "https://github.com/servo/ipc-channel"}
 lazy_static = "0.2"
diff --git a/components/net_traits/Cargo.toml b/components/net_traits/Cargo.toml
index 93f36a337d0..b7f99dbf6f1 100644
--- a/components/net_traits/Cargo.toml
+++ b/components/net_traits/Cargo.toml
@@ -14,7 +14,7 @@ msg = {path = "../msg"}
 ipc-channel = {git = "https://github.com/servo/ipc-channel"}
 heapsize = "0.3.0"
 heapsize_plugin = "0.1.2"
-hyper = { version = "0.9", features = [ "serde-serialization" ] }
+hyper = { version = "0.9.9", features = [ "serde-serialization" ] }
 image = "0.10"
 lazy_static = "0.2"
 log = "0.3.5"
diff --git a/components/script/Cargo.toml b/components/script/Cargo.toml
index b06d18af2ea..a8262f8324b 100644
--- a/components/script/Cargo.toml
+++ b/components/script/Cargo.toml
@@ -32,7 +32,7 @@ gfx_traits = {path = "../gfx_traits"}
 heapsize = "0.3.6"
 heapsize_plugin = "0.1.2"
 html5ever = {version = "0.5.1", features = ["heap_size", "unstable"]}
-hyper = {version = "0.9", features = ["serde-serialization"]}
+hyper = {version = "0.9.9", features = ["serde-serialization"]}
 image = "0.10"
 ipc-channel = {git = "https://github.com/servo/ipc-channel"}
 js = {git = "https://github.com/servo/rust-mozjs"}
diff --git a/components/script/dom/xmlhttprequest.rs b/components/script/dom/xmlhttprequest.rs
index b99cf70dbe3..af424fb83d7 100644
--- a/components/script/dom/xmlhttprequest.rs
+++ b/components/script/dom/xmlhttprequest.rs
@@ -635,7 +635,7 @@ impl XMLHttpRequestMethods for XMLHttpRequest {
                 }
 
                 if !content_type_set {
-                    let ct = request.headers.get::<ContentType>().map(|x| x.clone());
+                    let ct = request.headers.get_mut::<ContentType>();
                     if let Some(mut ct) = ct {
                         if let Some(encoding) = encoding {
                             for param in &mut (ct.0).2 {
@@ -646,10 +646,6 @@ impl XMLHttpRequestMethods for XMLHttpRequest {
                                 }
                             }
                         }
-                        // remove instead of mutate in place
-                        // https://github.com/hyperium/hyper/issues/821
-                        request.headers.remove_raw("content-type");
-                        request.headers.set(ct);
                     }
                 }
 
diff --git a/components/servo/Cargo.lock b/components/servo/Cargo.lock
index ebf850b542b..1019302be1b 100644
--- a/components/servo/Cargo.lock
+++ b/components/servo/Cargo.lock
@@ -501,7 +501,7 @@ name = "devtools"
 version = "0.0.1"
 dependencies = [
  "devtools_traits 0.0.1",
- "hyper 0.9.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.9.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipc-channel 0.2.3 (git+https://github.com/servo/ipc-channel)",
  "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "msg 0.0.1",
@@ -520,7 +520,7 @@ dependencies = [
  "bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize_plugin 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.9.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.9.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipc-channel 0.2.3 (git+https://github.com/servo/ipc-channel)",
  "msg 0.0.1",
  "serde 0.7.11 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -973,7 +973,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "hyper"
-version = "0.9.6"
+version = "0.9.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cookie 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1374,7 +1374,7 @@ dependencies = [
  "euclid 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize_plugin 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.9.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.9.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipc-channel 0.2.3 (git+https://github.com/servo/ipc-channel)",
  "layers 0.2.6 (git+https://github.com/servo/rust-layers)",
  "plugins 0.0.1",
@@ -1397,7 +1397,7 @@ dependencies = [
  "device 0.0.1 (git+https://github.com/servo/devices)",
  "devtools_traits 0.0.1",
  "flate2 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.9.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.9.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "immeta 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipc-channel 0.2.3 (git+https://github.com/servo/ipc-channel)",
  "lazy_static 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1444,7 +1444,7 @@ dependencies = [
  "cookie 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "devtools_traits 0.0.1",
  "flate2 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.9.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.9.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipc-channel 0.2.3 (git+https://github.com/servo/ipc-channel)",
  "msg 0.0.1",
  "net 0.0.1",
@@ -1464,7 +1464,7 @@ dependencies = [
  "cookie 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize_plugin 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.9.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.9.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "image 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipc-channel 0.2.3 (git+https://github.com/servo/ipc-channel)",
  "lazy_static 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1913,7 +1913,7 @@ dependencies = [
  "heapsize 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize_plugin 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "html5ever 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.9.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.9.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "image 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipc-channel 0.2.3 (git+https://github.com/servo/ipc-channel)",
  "js 0.1.3 (git+https://github.com/servo/rust-mozjs)",
@@ -2555,7 +2555,7 @@ name = "webdriver"
 version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "hyper 0.9.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.9.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 0.1.71 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2567,7 +2567,7 @@ version = "0.0.1"
 dependencies = [
  "cookie 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.9.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.9.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "image 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipc-channel 0.2.3 (git+https://github.com/servo/ipc-channel)",
  "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2630,7 +2630,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.9.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.9.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "net2 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
  "openssl 0.7.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/components/webdriver_server/Cargo.toml b/components/webdriver_server/Cargo.toml
index 7f64834682e..996d517a531 100644
--- a/components/webdriver_server/Cargo.toml
+++ b/components/webdriver_server/Cargo.toml
@@ -10,7 +10,7 @@ path = "lib.rs"
 
 [dependencies]
 euclid = "0.7.1"
-hyper = "0.9"
+hyper = "0.9.9"
 image = "0.10"
 ipc-channel = {git = "https://github.com/servo/ipc-channel"}
 log = "0.3.5"
diff --git a/ports/cef/Cargo.lock b/ports/cef/Cargo.lock
index e4ea04e2c19..1d86f04ca9f 100644
--- a/ports/cef/Cargo.lock
+++ b/ports/cef/Cargo.lock
@@ -460,7 +460,7 @@ name = "devtools"
 version = "0.0.1"
 dependencies = [
  "devtools_traits 0.0.1",
- "hyper 0.9.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.9.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipc-channel 0.2.3 (git+https://github.com/servo/ipc-channel)",
  "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "msg 0.0.1",
@@ -479,7 +479,7 @@ dependencies = [
  "bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize_plugin 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.9.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.9.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipc-channel 0.2.3 (git+https://github.com/servo/ipc-channel)",
  "msg 0.0.1",
  "serde 0.7.11 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -882,7 +882,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "hyper"
-version = "0.9.6"
+version = "0.9.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cookie 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1276,7 +1276,7 @@ dependencies = [
  "euclid 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize_plugin 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.9.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.9.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipc-channel 0.2.3 (git+https://github.com/servo/ipc-channel)",
  "layers 0.2.6 (git+https://github.com/servo/rust-layers)",
  "plugins 0.0.1",
@@ -1299,7 +1299,7 @@ dependencies = [
  "device 0.0.1 (git+https://github.com/servo/devices)",
  "devtools_traits 0.0.1",
  "flate2 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.9.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.9.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "immeta 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipc-channel 0.2.3 (git+https://github.com/servo/ipc-channel)",
  "lazy_static 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1345,7 +1345,7 @@ dependencies = [
  "cookie 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize_plugin 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.9.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.9.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "image 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipc-channel 0.2.3 (git+https://github.com/servo/ipc-channel)",
  "lazy_static 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1767,7 +1767,7 @@ dependencies = [
  "heapsize 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize_plugin 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "html5ever 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.9.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.9.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "image 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipc-channel 0.2.3 (git+https://github.com/servo/ipc-channel)",
  "js 0.1.3 (git+https://github.com/servo/rust-mozjs)",
@@ -2417,7 +2417,7 @@ name = "webdriver"
 version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "hyper 0.9.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.9.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 0.1.71 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2429,7 +2429,7 @@ version = "0.0.1"
 dependencies = [
  "cookie 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.9.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.9.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "image 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipc-channel 0.2.3 (git+https://github.com/servo/ipc-channel)",
  "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2492,7 +2492,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.9.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.9.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "net2 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
  "openssl 0.7.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/tests/unit/net/Cargo.toml b/tests/unit/net/Cargo.toml
index 485c0897ee7..b8027ccc93b 100644
--- a/tests/unit/net/Cargo.toml
+++ b/tests/unit/net/Cargo.toml
@@ -13,7 +13,7 @@ content-blocker = "0.2"
 cookie = "0.2"
 devtools_traits = {path = "../../../components/devtools_traits"}
 flate2 = "0.2.0"
-hyper = "0.9"
+hyper = "0.9.9"
 ipc-channel = {git = "https://github.com/servo/ipc-channel"}
 msg = {path = "../../../components/msg"}
 net = {path = "../../../components/net"}