diff --git a/Cargo.lock b/Cargo.lock
index 1e6704c9..e597babd 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2564,9 +2564,9 @@ dependencies = [
 
 [[package]]
 name = "once_cell"
-version = "1.16.0"
+version = "1.17.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "86f0b0d4bf799edbc74508c1e8bf170ff5f41238e5f8225603ca7caaae2b7860"
+checksum = "6f61fba1741ea2b3d6a1e3178721804bb716a68a6aeba1149b5d52e3d464ea66"
 
 [[package]]
 name = "oorandom"
diff --git a/zebra-consensus/Cargo.toml b/zebra-consensus/Cargo.toml
index c95e3aa0..845d9811 100644
--- a/zebra-consensus/Cargo.toml
+++ b/zebra-consensus/Cargo.toml
@@ -23,7 +23,7 @@ chrono = { version = "0.4.23", default-features = false, features = ["clock", "s
 dirs = "4.0.0"
 displaydoc = "0.2.3"
 lazy_static = "1.4.0"
-once_cell = "1.16.0"
+once_cell = "1.17.0"
 serde = { version = "1.0.152", features = ["serde_derive"] }
 
 futures = "0.3.25"
diff --git a/zebra-state/Cargo.toml b/zebra-state/Cargo.toml
index df86eb0a..d9c9f69c 100644
--- a/zebra-state/Cargo.toml
+++ b/zebra-state/Cargo.toml
@@ -58,7 +58,7 @@ color-eyre = "0.6.2"
 # Enable a feature that makes tinyvec compile much faster.
 tinyvec = { version = "1.6.0", features = ["rustc_1_55"] }
 
-once_cell = "1.16.0"
+once_cell = "1.17.0"
 spandoc = "0.2.2"
 
 hex = { version = "0.4.3", features = ["serde"] }
diff --git a/zebra-test/Cargo.toml b/zebra-test/Cargo.toml
index 4e35d2f0..3d525a3e 100644
--- a/zebra-test/Cargo.toml
+++ b/zebra-test/Cargo.toml
@@ -13,7 +13,7 @@ indexmap = "1.9.2"
 lazy_static = "1.4.0"
 insta = "1.23.0"
 proptest = "0.10.1"
-once_cell = "1.16.0"
+once_cell = "1.17.0"
 rand = { version = "0.8.5", package = "rand" }
 regex = "1.7.0"
 
diff --git a/zebrad/Cargo.toml b/zebrad/Cargo.toml
index c9e05d46..dc2c124f 100644
--- a/zebrad/Cargo.toml
+++ b/zebrad/Cargo.toml
@@ -167,7 +167,7 @@ tonic-build = { version = "0.8.0", optional = true }
 [dev-dependencies]
 abscissa_core = { version = "0.5", features = ["testing"] }
 hex = "0.4.3"
-once_cell = "1.16.0"
+once_cell = "1.17.0"
 regex = "1.7.0"
 semver = "1.0.16"