diff --git a/Cargo.lock b/Cargo.lock
index 8e518f2f..b5b37916 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2608,9 +2608,9 @@ dependencies = [
 
 [[package]]
 name = "once_cell"
-version = "1.9.0"
+version = "1.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "da32515d9f6e6e489d7bc9d84c71b060db7247dc035bbe44eac88cf87486d8d5"
+checksum = "87f3e037eac156d1775da914196f0f37741a274155e34a0b7e427c35d2a2ecb9"
 
 [[package]]
 name = "oorandom"
diff --git a/zebra-consensus/Cargo.toml b/zebra-consensus/Cargo.toml
index 6597743c..847f2f28 100644
--- a/zebra-consensus/Cargo.toml
+++ b/zebra-consensus/Cargo.toml
@@ -22,7 +22,7 @@ chrono = "0.4.19"
 dirs = "4.0.0"
 displaydoc = "0.2.3"
 lazy_static = "1.4.0"
-once_cell = "1.9.0"
+once_cell = "1.10.0"
 serde = { version = "1.0.136", features = ["serde_derive"] }
 
 futures = "0.3.21"
diff --git a/zebra-state/Cargo.toml b/zebra-state/Cargo.toml
index 02053c22..894f8a97 100644
--- a/zebra-state/Cargo.toml
+++ b/zebra-state/Cargo.toml
@@ -35,7 +35,7 @@ zebra-test = { path = "../zebra-test/", optional = true }
 
 [dev-dependencies]
 color-eyre = "0.6.0"
-once_cell = "1.9.0"
+once_cell = "1.10.0"
 insta = { version = "1.12.0", features = ["ron"] }
 itertools = "0.10.3"
 proptest = "0.10.1"
diff --git a/zebra-test/Cargo.toml b/zebra-test/Cargo.toml
index 372e2a4c..206437c7 100644
--- a/zebra-test/Cargo.toml
+++ b/zebra-test/Cargo.toml
@@ -12,7 +12,7 @@ hex = "0.4.3"
 lazy_static = "1.4.0"
 insta = "1.12.0"
 proptest = "0.10.1"
-once_cell = "1.9.0"
+once_cell = "1.10.0"
 rand = { version = "0.8.5", package = "rand" }
 regex = "1.5.4"
 
diff --git a/zebrad/Cargo.toml b/zebrad/Cargo.toml
index feb0edb1..a44e7ed7 100644
--- a/zebrad/Cargo.toml
+++ b/zebrad/Cargo.toml
@@ -58,7 +58,7 @@ vergen = { version = "6.0.2", default-features = false, features = ["cargo", "gi
 
 [dev-dependencies]
 abscissa_core = { version = "0.5", features = ["testing"] }
-once_cell = "1.9.0"
+once_cell = "1.10.0"
 regex = "1.5.4"
 semver = "1.0.6"
 serde_json = "1.0"