diff --git a/Cargo.lock b/Cargo.lock
index 6e00dfc44..9552173d1 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2325,7 +2325,7 @@ dependencies = [
 [[package]]
 name = "base-common-chains"
 version = "0.0.0"
-source = "git+https://github.com/base/base.git?rev=f9d7bf5072faaf33b803d23f3102e4def1b23d75#f9d7bf5072faaf33b803d23f3102e4def1b23d75"
+source = "git+https://github.com/base/base.git?rev=990694fce8f1358b71cf0854e871f74e2a3e2cb9#990694fce8f1358b71cf0854e871f74e2a3e2cb9"
 dependencies = [
  "alloy-chains",
  "alloy-eips",
@@ -2341,7 +2341,7 @@ dependencies = [
 [[package]]
 name = "base-common-consensus"
 version = "0.0.0"
-source = "git+https://github.com/base/base.git?rev=f9d7bf5072faaf33b803d23f3102e4def1b23d75#f9d7bf5072faaf33b803d23f3102e4def1b23d75"
+source = "git+https://github.com/base/base.git?rev=990694fce8f1358b71cf0854e871f74e2a3e2cb9#990694fce8f1358b71cf0854e871f74e2a3e2cb9"
 dependencies = [
  "alloy-consensus",
  "alloy-eips",
@@ -2365,7 +2365,7 @@ dependencies = [
 [[package]]
 name = "base-common-eip8130"
 version = "0.0.0"
-source = "git+https://github.com/base/base.git?rev=f9d7bf5072faaf33b803d23f3102e4def1b23d75#f9d7bf5072faaf33b803d23f3102e4def1b23d75"
+source = "git+https://github.com/base/base.git?rev=990694fce8f1358b71cf0854e871f74e2a3e2cb9#990694fce8f1358b71cf0854e871f74e2a3e2cb9"
 dependencies = [
  "alloy-primitives",
  "base-common-consensus",
@@ -2375,7 +2375,7 @@ dependencies = [
 [[package]]
 name = "base-common-genesis"
 version = "0.0.0"
-source = "git+https://github.com/base/base.git?rev=f9d7bf5072faaf33b803d23f3102e4def1b23d75#f9d7bf5072faaf33b803d23f3102e4def1b23d75"
+source = "git+https://github.com/base/base.git?rev=990694fce8f1358b71cf0854e871f74e2a3e2cb9#990694fce8f1358b71cf0854e871f74e2a3e2cb9"
 dependencies = [
  "alloy-chains",
  "alloy-consensus",
@@ -2393,7 +2393,7 @@ dependencies = [
 [[package]]
 name = "base-common-precompiles"
 version = "0.0.0"
-source = "git+https://github.com/base/base.git?rev=f9d7bf5072faaf33b803d23f3102e4def1b23d75#f9d7bf5072faaf33b803d23f3102e4def1b23d75"
+source = "git+https://github.com/base/base.git?rev=990694fce8f1358b71cf0854e871f74e2a3e2cb9#990694fce8f1358b71cf0854e871f74e2a3e2cb9"
 dependencies = [
  "alloy-evm",
  "alloy-primitives",
@@ -2409,7 +2409,7 @@ dependencies = [
 [[package]]
 name = "base-precompile-macros"
 version = "0.0.0"
-source = "git+https://github.com/base/base.git?rev=f9d7bf5072faaf33b803d23f3102e4def1b23d75#f9d7bf5072faaf33b803d23f3102e4def1b23d75"
+source = "git+https://github.com/base/base.git?rev=990694fce8f1358b71cf0854e871f74e2a3e2cb9#990694fce8f1358b71cf0854e871f74e2a3e2cb9"
 dependencies = [
  "alloy-primitives",
  "proc-macro2",
@@ -2420,7 +2420,7 @@ dependencies = [
 [[package]]
 name = "base-precompile-storage"
 version = "0.0.0"
-source = "git+https://github.com/base/base.git?rev=f9d7bf5072faaf33b803d23f3102e4def1b23d75#f9d7bf5072faaf33b803d23f3102e4def1b23d75"
+source = "git+https://github.com/base/base.git?rev=990694fce8f1358b71cf0854e871f74e2a3e2cb9#990694fce8f1358b71cf0854e871f74e2a3e2cb9"
 dependencies = [
  "alloy-evm",
  "alloy-primitives",
diff --git a/crates/anvil/src/cmd.rs b/crates/anvil/src/cmd.rs
index 995829ae7..60b70ae73 100644
--- a/crates/anvil/src/cmd.rs
+++ b/crates/anvil/src/cmd.rs
@@ -850,7 +850,7 @@ mod tests {
         let args: NodeArgs = NodeArgs::parse_from(["anvil", "--base"]);
         assert_eq!(
             args.evm.networks.base_upgrade(),
-            Some(foundry_evm_networks::BaseUpgrade::Cobalt)
+            Some(foundry_evm_networks::BaseUpgrade::Denim)
         );
     }
 
diff --git a/crates/evm/networks/Cargo.toml b/crates/evm/networks/Cargo.toml
index 98465e963..41eecff0a 100644
--- a/crates/evm/networks/Cargo.toml
+++ b/crates/evm/networks/Cargo.toml
@@ -29,8 +29,8 @@ alloy-primitives = { workspace = true, features = [
 # github.com/base/base; bump via ./script/bump-base.sh. To iterate against a
 # local base/base checkout instead, uncomment the [patch] block at the bottom
 # of the workspace root Cargo.toml.
-base-common-precompiles = { git = "https://github.com/base/base.git", rev = "f9d7bf5072faaf33b803d23f3102e4def1b23d75" }
-base-common-chains = { git = "https://github.com/base/base.git", rev = "f9d7bf5072faaf33b803d23f3102e4def1b23d75" }
+base-common-precompiles = { git = "https://github.com/base/base.git", rev = "990694fce8f1358b71cf0854e871f74e2a3e2cb9" }
+base-common-chains = { git = "https://github.com/base/base.git", rev = "990694fce8f1358b71cf0854e871f74e2a3e2cb9" }
 
 revm = { workspace = true, features = [
     "std",
diff --git a/crates/evm/networks/src/lib.rs b/crates/evm/networks/src/lib.rs
index 6050cc5d4..f31ddc9d8 100644
--- a/crates/evm/networks/src/lib.rs
+++ b/crates/evm/networks/src/lib.rs
@@ -58,7 +58,7 @@ const DEFAULT_BASE_ACTIVATION_ADMIN: Address =
 /// `--base` is passed with no value. Deliberately not tied to upstream
 /// `BaseUpgrade::LATEST` (`Beryl`), which lags base-anvil's own release
 /// cadence; bump this alongside `./script/bump-base.sh` as new upgrades land.
-const DEFAULT_BASE_UPGRADE: BaseUpgrade = BaseUpgrade::Cobalt;
+const DEFAULT_BASE_UPGRADE: BaseUpgrade = BaseUpgrade::Denim;
 
 pub mod celo;
 
@@ -118,7 +118,7 @@ pub struct NetworkConfigs {
         long,
         conflicts_with = "celo",
         num_args(0..=1),
-        default_missing_value = "cobalt", // keep in sync with DEFAULT_BASE_UPGRADE
+        default_missing_value = "denim", // keep in sync with DEFAULT_BASE_UPGRADE
     )]
     #[serde(default, with = "base_flag")]
     base: Option<BaseUpgrade>,
@@ -347,10 +347,10 @@ mod tests {
 
     #[test]
     fn default_missing_value_matches_default_base_upgrade() {
-        // Guards against the CLI's `default_missing_value = "cobalt"` string
+        // Guards against the CLI's `default_missing_value = "denim"` string
         // literal drifting from `DEFAULT_BASE_UPGRADE`, since clap can't
         // reference the constant directly.
-        assert_eq!("cobalt".parse::<BaseUpgrade>().unwrap(), DEFAULT_BASE_UPGRADE);
+        assert_eq!("denim".parse::<BaseUpgrade>().unwrap(), DEFAULT_BASE_UPGRADE);
     }
 
     #[test]