diff --git a/Cargo.lock b/Cargo.lock
index 1ed06136646..8cf7e89ba7b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1386,9 +1386,9 @@ dependencies = [
 
 [[package]]
 name = "either"
-version = "1.9.0"
+version = "1.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a26ae43d7bcc3b814de94796a5e736d4029efb0ee900c12e2d54c993ad1a1e07"
+checksum = "3dca9240753cf90908d7e4aac30f630662b02aebaa1b58a3cadabdb23385b58b"
 
 [[package]]
 name = "elliptic-curve"
diff --git a/core/Cargo.toml b/core/Cargo.toml
index 619cd357744..6e0a965dcea 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 = "1.9"
+either = "1.12"
 fnv = "1.0"
 futures = { version = "0.3.30", features = ["executor", "thread-pool"] }
 futures-timer = "3"
diff --git a/examples/file-sharing/Cargo.toml b/examples/file-sharing/Cargo.toml
index e38039a11bb..95e73a42f98 100644
--- a/examples/file-sharing/Cargo.toml
+++ b/examples/file-sharing/Cargo.toml
@@ -12,7 +12,7 @@ release = false
 serde = { version = "1.0", features = ["derive"] }
 async-std = { version = "1.12", features = ["attributes"] }
 clap = { version = "4.4.16", features = ["derive"] }
-either = "1.9"
+either = "1.12"
 futures = "0.3.30"
 libp2p = { path = "../../libp2p", features = [ "async-std", "cbor", "dns", "kad", "noise", "macros", "request-response", "tcp", "websocket", "yamux"] }
 tracing = "0.1.37"
diff --git a/examples/ipfs-private/Cargo.toml b/examples/ipfs-private/Cargo.toml
index daa68cd8f5a..0c2cd35b563 100644
--- a/examples/ipfs-private/Cargo.toml
+++ b/examples/ipfs-private/Cargo.toml
@@ -11,7 +11,7 @@ release = false
 [dependencies]
 tokio = { version = "1.36", features = ["rt-multi-thread", "macros", "io-std"] }
 async-trait = "0.1"
-either = "1.9"
+either = "1.12"
 futures = "0.3.30"
 libp2p = { path = "../../libp2p", features = [ "tokio", "gossipsub", "dns", "identify", "kad", "macros", "noise", "ping", "pnet", "tcp", "websocket", "yamux"] }
 tracing = "0.1.37"
diff --git a/hole-punching-tests/Cargo.toml b/hole-punching-tests/Cargo.toml
index 9e6fb15965d..0706e3fc7f9 100644
--- a/hole-punching-tests/Cargo.toml
+++ b/hole-punching-tests/Cargo.toml
@@ -15,4 +15,4 @@ redis = { version = "0.23.0", default-features = false, features = ["tokio-comp"
 tokio = { version = "1.36.0", features = ["full"] }
 serde = { version = "1.0.196", features = ["derive"] }
 serde_json = "1.0.113"
-either = "1.9.0"
+either = "1.12.0"
diff --git a/interop-tests/Cargo.toml b/interop-tests/Cargo.toml
index 81c17e19303..3620335c447 100644
--- a/interop-tests/Cargo.toml
+++ b/interop-tests/Cargo.toml
@@ -13,7 +13,7 @@ crate-type = ["cdylib", "rlib"]
 
 [dependencies]
 anyhow = "1"
-either = "1.9.0"
+either = "1.12.0"
 futures = "0.3.30"
 rand = "0.8.5"
 serde = { version = "1", features = ["derive"] }
diff --git a/protocols/dcutr/Cargo.toml b/protocols/dcutr/Cargo.toml
index aed7e2bf762..13667c49881 100644
--- a/protocols/dcutr/Cargo.toml
+++ b/protocols/dcutr/Cargo.toml
@@ -12,7 +12,7 @@ categories = ["network-programming", "asynchronous"]
 
 [dependencies]
 asynchronous-codec = { workspace = true }
-either = "1.9.0"
+either = "1.12.0"
 futures = "0.3.30"
 futures-timer = "3.0"
 instant = "0.1.12"
diff --git a/protocols/gossipsub/Cargo.toml b/protocols/gossipsub/Cargo.toml
index 4d484a81249..18f9f8692ce 100644
--- a/protocols/gossipsub/Cargo.toml
+++ b/protocols/gossipsub/Cargo.toml
@@ -18,7 +18,7 @@ asynchronous-codec = { workspace = true }
 base64 = "0.21.7"
 byteorder = "1.5.0"
 bytes = "1.5"
-either = "1.9"
+either = "1.12"
 fnv = "1.0.7"
 futures = "0.3.30"
 futures-ticker = "0.0.3"
diff --git a/protocols/identify/Cargo.toml b/protocols/identify/Cargo.toml
index 2fb51d87627..4f9d3b00041 100644
--- a/protocols/identify/Cargo.toml
+++ b/protocols/identify/Cargo.toml
@@ -25,7 +25,7 @@ smallvec = "1.12.0"
 thiserror = "1.0"
 tracing = "0.1.37"
 void = "1.0"
-either = "1.9.0"
+either = "1.12.0"
 
 [dev-dependencies]
 async-std = { version = "1.6.2", features = ["attributes"] }
diff --git a/protocols/kad/Cargo.toml b/protocols/kad/Cargo.toml
index bde0d5f7c84..8d6f8c073f6 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 = "1.9"
+either = "1.12"
 fnv = "1.0"
 asynchronous-codec = { workspace = true }
 futures = "0.3.30"
diff --git a/protocols/ping/Cargo.toml b/protocols/ping/Cargo.toml
index a4d9259e9aa..bd771e5a025 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 = "1.9.0"
+either = "1.12.0"
 futures = "0.3.30"
 futures-timer = "3.0.2"
 instant = "0.1.12"
diff --git a/protocols/relay/Cargo.toml b/protocols/relay/Cargo.toml
index 94b9deb1a64..4e5d3ffe3eb 100644
--- a/protocols/relay/Cargo.toml
+++ b/protocols/relay/Cargo.toml
@@ -13,7 +13,7 @@ categories = ["network-programming", "asynchronous"]
 [dependencies]
 asynchronous-codec = { workspace = true }
 bytes = "1"
-either = "1.9.0"
+either = "1.12.0"
 futures = "0.3.30"
 futures-timer = "3"
 futures-bounded = { workspace = true }
diff --git a/swarm/Cargo.toml b/swarm/Cargo.toml
index a700c1c1c5a..bdcd9816341 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 = "1.9.0"
+either = "1.12.0"
 fnv = "1.0"
 futures = "0.3.30"
 futures-timer = "3.0.2"
@@ -41,7 +41,7 @@ wasm-bindgen = ["dep:wasm-bindgen-futures", "dep:getrandom"]
 
 [dev-dependencies]
 async-std = { version = "1.6.2", features = ["attributes"] }
-either = "1.9.0"
+either = "1.12.0"
 futures = "0.3.30"
 libp2p-identify = { path = "../protocols/identify" }                # Using `path` here because this is a cyclic dev-dependency which otherwise breaks releasing.
 libp2p-identity = { workspace = true, features = ["ed25519"] }
diff --git a/transports/websocket/Cargo.toml b/transports/websocket/Cargo.toml
index 385e292103c..c40694e28ba 100644
--- a/transports/websocket/Cargo.toml
+++ b/transports/websocket/Cargo.toml
@@ -12,7 +12,7 @@ categories = ["network-programming", "asynchronous"]
 
 [dependencies]
 futures-rustls = "0.24.0"
-either = "1.9.0"
+either = "1.12.0"
 futures = "0.3.30"
 libp2p-core = { workspace = true }
 libp2p-identity = { workspace = true }