diff --git a/Cargo.lock b/Cargo.lock
index c7e92fd8..f5e37a48 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1485,9 +1485,9 @@ dependencies = [
 
 [[package]]
 name = "either"
-version = "1.8.1"
+version = "1.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7fcaabb2fef8c910e7f4c7ce9f67a1283a1715879a7c230ca9d6d1ae31f16d91"
+checksum = "a26ae43d7bcc3b814de94796a5e736d4029efb0ee900c12e2d54c993ad1a1e07"
 
 [[package]]
 name = "elliptic-curve"
diff --git a/core/Cargo.toml b/core/Cargo.toml
index bc18a771..34da753e 100644
--- a/core/Cargo.toml
+++ b/core/Cargo.toml
@@ -11,7 +11,7 @@ keywords = ["peer-to-peer", "libp2p", "networking"]
 categories = ["network-programming", "asynchronous"]
 
 [dependencies]
-either = "1.5"
+either = "1.9"
 fnv = "1.0"
 futures = { version = "0.3.28", features = ["executor", "thread-pool"] }
 futures-timer = "3"
diff --git a/examples/file-sharing/Cargo.toml b/examples/file-sharing/Cargo.toml
index 8055ee82..348b62fd 100644
--- a/examples/file-sharing/Cargo.toml
+++ b/examples/file-sharing/Cargo.toml
@@ -9,7 +9,7 @@ license = "MIT"
 serde = { version = "1.0", features = ["derive"] }
 async-std = { version = "1.12", features = ["attributes"] }
 clap = { version = "4.3.12", features = ["derive"] }
-either = "1.8"
+either = "1.9"
 env_logger = "0.10"
 futures = "0.3.28"
 libp2p = { path = "../../libp2p", features = ["async-std", "cbor", "dns", "kad", "noise", "macros", "request-response", "tcp", "websocket", "yamux"] }
diff --git a/examples/ipfs-private/Cargo.toml b/examples/ipfs-private/Cargo.toml
index c1e860a0..7871e5c4 100644
--- a/examples/ipfs-private/Cargo.toml
+++ b/examples/ipfs-private/Cargo.toml
@@ -8,7 +8,7 @@ license = "MIT"
 [dependencies]
 async-std = { version = "1.12", features = ["attributes"] }
 async-trait = "0.1"
-either = "1.8"
+either = "1.9"
 env_logger = "0.10"
 futures = "0.3.28"
 libp2p = { path = "../../libp2p", features = ["async-std", "gossipsub", "dns", "identify", "kad", "macros", "noise", "ping", "pnet", "tcp", "websocket", "yamux"] }
diff --git a/interop-tests/Cargo.toml b/interop-tests/Cargo.toml
index b88cd0e7..a2e281db 100644
--- a/interop-tests/Cargo.toml
+++ b/interop-tests/Cargo.toml
@@ -10,7 +10,7 @@ crate-type = ["cdylib", "rlib"]
 
 [dependencies]
 anyhow = "1"
-either = "1.8.0"
+either = "1.9.0"
 env_logger = "0.10.0"
 futures = "0.3.28"
 log = "0.4"
diff --git a/protocols/dcutr/Cargo.toml b/protocols/dcutr/Cargo.toml
index 27a927e6..5ef81f0d 100644
--- a/protocols/dcutr/Cargo.toml
+++ b/protocols/dcutr/Cargo.toml
@@ -12,7 +12,7 @@ categories = ["network-programming", "asynchronous"]
 
 [dependencies]
 asynchronous-codec = "0.6"
-either = "1.6.0"
+either = "1.9.0"
 futures = "0.3.28"
 futures-timer = "3.0"
 instant = "0.1.12"
diff --git a/protocols/gossipsub/Cargo.toml b/protocols/gossipsub/Cargo.toml
index 25232ff5..4351a735 100644
--- a/protocols/gossipsub/Cargo.toml
+++ b/protocols/gossipsub/Cargo.toml
@@ -18,7 +18,7 @@ asynchronous-codec = "0.6"
 base64 = "0.21.2"
 byteorder = "1.3.4"
 bytes = "1.4"
-either = "1.5"
+either = "1.9"
 fnv = "1.0.7"
 futures = "0.3.28"
 futures-ticker = "0.0.3"
diff --git a/protocols/identify/Cargo.toml b/protocols/identify/Cargo.toml
index 8fc9339c..61d38ede 100644
--- a/protocols/identify/Cargo.toml
+++ b/protocols/identify/Cargo.toml
@@ -24,7 +24,7 @@ quick-protobuf = "0.8"
 smallvec = "1.11.0"
 thiserror = "1.0"
 void = "1.0"
-either = "1.8.0"
+either = "1.9.0"
 
 [dev-dependencies]
 async-std = { version = "1.6.2", features = ["attributes"] }
diff --git a/protocols/kad/Cargo.toml b/protocols/kad/Cargo.toml
index 49732c85..aa66dd30 100644
--- a/protocols/kad/Cargo.toml
+++ b/protocols/kad/Cargo.toml
@@ -13,7 +13,7 @@ categories = ["network-programming", "asynchronous"]
 [dependencies]
 arrayvec = "0.7.4"
 bytes = "1"
-either = "1.5"
+either = "1.9"
 fnv = "1.0"
 asynchronous-codec = "0.6"
 futures = "0.3.28"
diff --git a/protocols/ping/Cargo.toml b/protocols/ping/Cargo.toml
index aba62c3a..aebc4735 100644
--- a/protocols/ping/Cargo.toml
+++ b/protocols/ping/Cargo.toml
@@ -11,7 +11,7 @@ keywords = ["peer-to-peer", "libp2p", "networking"]
 categories = ["network-programming", "asynchronous"]
 
 [dependencies]
-either = "1.8.0"
+either = "1.9.0"
 futures = "0.3.28"
 futures-timer = "3.0.2"
 instant = "0.1.12"
diff --git a/protocols/relay/Cargo.toml b/protocols/relay/Cargo.toml
index 7830dcdd..a749e6f2 100644
--- a/protocols/relay/Cargo.toml
+++ b/protocols/relay/Cargo.toml
@@ -13,7 +13,7 @@ categories = ["network-programming", "asynchronous"]
 [dependencies]
 asynchronous-codec = "0.6"
 bytes = "1"
-either = "1.6.0"
+either = "1.9.0"
 futures = "0.3.28"
 futures-timer = "3"
 instant = "0.1.12"
diff --git a/swarm/Cargo.toml b/swarm/Cargo.toml
index 35279c4d..10bd747e 100644
--- a/swarm/Cargo.toml
+++ b/swarm/Cargo.toml
@@ -11,7 +11,7 @@ keywords = ["peer-to-peer", "libp2p", "networking"]
 categories = ["network-programming", "asynchronous"]
 
 [dependencies]
-either = "1.6.0"
+either = "1.9.0"
 fnv = "1.0"
 futures = "0.3.28"
 futures-timer = "3.0.2"
@@ -40,7 +40,7 @@ wasm-bindgen = ["dep:wasm-bindgen-futures", "dep:getrandom"]
 
 [dev-dependencies]
 async-std = { version = "1.6.2", features = ["attributes"] }
-either = "1.6.0"
+either = "1.9.0"
 env_logger = "0.10"
 futures = "0.3.28"
 libp2p-identify = { path = "../protocols/identify" } # Using `path` here because this is a cyclic dev-dependency which otherwise breaks releasing.
diff --git a/transports/websocket/Cargo.toml b/transports/websocket/Cargo.toml
index a5559b88..4ae420b6 100644
--- a/transports/websocket/Cargo.toml
+++ b/transports/websocket/Cargo.toml
@@ -12,7 +12,7 @@ categories = ["network-programming", "asynchronous"]
 
 [dependencies]
 futures-rustls = "0.22"
-either = "1.5.3"
+either = "1.9.0"
 futures = "0.3.28"
 libp2p-core = { workspace = true }
 libp2p-identity = { workspace = true }