diff --git a/Cargo.lock b/Cargo.lock
index e727454a..9037f196 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1404,9 +1404,9 @@ checksum = "8d3b63360ec3cb337817c2dbd47ab4a0f170d285d8e5a2064600f3def1402397"
 
 [[package]]
 name = "once_cell"
-version = "1.6.0"
+version = "1.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4ad167a2f54e832b82dbe003a046280dceffe5227b5f79e08e363a29638cfddd"
+checksum = "10acf907b94fc1b1a152d08ef97e7759650268cf986bf127f387e602b02c7e5a"
 
 [[package]]
 name = "opaque-debug"
diff --git a/ethers-contract/Cargo.toml b/ethers-contract/Cargo.toml
index b51240f1..291e16f6 100644
--- a/ethers-contract/Cargo.toml
+++ b/ethers-contract/Cargo.toml
@@ -19,7 +19,7 @@ ethers-contract-derive = { version = "0.2", path = "ethers-contract-derive", opt
 serde = { version = "1.0.123", default-features = false }
 serde_json = { version = "1.0.62", default-features = false }
 thiserror = { version = "1.0.24", default-features = false }
-once_cell = { version = "1.6.0", default-features = false }
+once_cell = { version = "1.7.0", default-features = false }
 pin-project = {version = "1.0.5", default-features = false }
 futures-util = { version = "0.3.12", default-features = false }
 hex = { version = "0.4.2", default-features = false, features = ["std"] }
diff --git a/ethers-core/Cargo.toml b/ethers-core/Cargo.toml
index 6862a62b..5db1ae46 100644
--- a/ethers-core/Cargo.toml
+++ b/ethers-core/Cargo.toml
@@ -42,7 +42,7 @@ ethers = { version = "0.2", path = "../ethers" }
 
 serde_json = { version = "1.0.62", default-features = false }
 bincode = { version = "1.2.1", default-features = false }
-once_cell = { version = "1.6.0" }
+once_cell = { version = "1.7.0" }
 
 
 [features]