diff --git a/crates/common/src/compile.rs b/crates/common/src/compile.rs
index d0f9afbb1e4d2..b0f25be1dff56 100644
--- a/crates/common/src/compile.rs
+++ b/crates/common/src/compile.rs
@@ -23,6 +23,7 @@ use foundry_compilers::{
     solc::SolcSettings,
 };
 use num_format::{Locale, ToFormattedString};
+use revm::primitives::{eip170, eip3860, eip7954, hardfork::SpecId};
 use solar::{
     ast::{Arena, ContractKind, ItemKind},
     interface::{Session, source_map::FileName},
@@ -357,10 +358,10 @@ impl ProjectCompiler {
 
             sh_println!("{size_report}")?;
 
-            let runtime_eip = if size_report.limits.runtime == CONTRACT_RUNTIME_SIZE_LIMIT {
-                "EIP-170: "
-            } else {
-                ""
+            let runtime_eip = match size_report.limits.runtime {
+                CONTRACT_RUNTIME_SIZE_LIMIT => "EIP-170: ",
+                eip7954::MAX_CODE_SIZE => "EIP-7954: ",
+                _ => "",
             };
             eyre::ensure!(
                 !size_report.exceeds_runtime_size_limit(),
@@ -368,10 +369,10 @@ impl ProjectCompiler {
                 size_report.limits.runtime
             );
             // Check size limits only if not ignoring EIP-3860
-            let initcode_eip = if size_report.limits.initcode == CONTRACT_INITCODE_SIZE_LIMIT {
-                "EIP-3860: "
-            } else {
-                ""
+            let initcode_eip = match size_report.limits.initcode {
+                CONTRACT_INITCODE_SIZE_LIMIT => "EIP-3860: ",
+                eip7954::MAX_INITCODE_SIZE => "EIP-7954: ",
+                _ => "",
             };
             eyre::ensure!(
                 self.ignore_eip_3860 || !size_report.exceeds_initcode_size_limit(),
@@ -385,10 +386,10 @@ impl ProjectCompiler {
 }
 
 // https://eips.ethereum.org/EIPS/eip-170
-const CONTRACT_RUNTIME_SIZE_LIMIT: usize = 24576;
+const CONTRACT_RUNTIME_SIZE_LIMIT: usize = eip170::MAX_CODE_SIZE;
 
 // https://eips.ethereum.org/EIPS/eip-3860
-const CONTRACT_INITCODE_SIZE_LIMIT: usize = 49152;
+const CONTRACT_INITCODE_SIZE_LIMIT: usize = eip3860::MAX_INITCODE_SIZE;
 
 const CONTRACT_RUNTIME_SIZE_WARN_THRESHOLD: usize = 18_000;
 const CONTRACT_INITCODE_SIZE_WARN_THRESHOLD: usize = 36_000;
@@ -413,6 +414,15 @@ impl ContractSizeLimits {
         Self { runtime, initcode: runtime.saturating_mul(2) }
     }
 
+    /// Returns the protocol limits active for an EVM specification.
+    pub const fn for_spec_id(spec_id: SpecId) -> Self {
+        if spec_id.is_enabled_in(SpecId::AMSTERDAM) {
+            Self::new(eip7954::MAX_CODE_SIZE, eip7954::MAX_INITCODE_SIZE)
+        } else {
+            Self::new(CONTRACT_RUNTIME_SIZE_LIMIT, CONTRACT_INITCODE_SIZE_LIMIT)
+        }
+    }
+
     const fn runtime_warning_threshold(self) -> usize {
         scaled_threshold(
             self.runtime,
@@ -898,4 +908,13 @@ mod tests {
             ContractSizeLimits::new(50_000, 100_000)
         );
     }
+
+    #[test]
+    fn contract_size_limits_follow_evm_spec() {
+        assert_eq!(ContractSizeLimits::for_spec_id(SpecId::OSAKA), ContractSizeLimits::default());
+        assert_eq!(
+            ContractSizeLimits::for_spec_id(SpecId::AMSTERDAM),
+            ContractSizeLimits::new(eip7954::MAX_CODE_SIZE, eip7954::MAX_INITCODE_SIZE)
+        );
+    }
 }
diff --git a/crates/forge/src/cmd/build.rs b/crates/forge/src/cmd/build.rs
index 6fd83203ca7a1..7a3ce45f6eb8b 100644
--- a/crates/forge/src/cmd/build.rs
+++ b/crates/forge/src/cmd/build.rs
@@ -128,7 +128,7 @@ impl BuildArgs {
                 config
                     .code_size_limit
                     .map(ContractSizeLimits::with_runtime_limit)
-                    .unwrap_or_default(),
+                    .unwrap_or_else(|| ContractSizeLimits::for_spec_id(config.evm_spec_id())),
             )
             .bail(!format_json)
             .compile(&project)?;
diff --git a/crates/forge/tests/cli/build.rs b/crates/forge/tests/cli/build.rs
index ba733a5e2a0bf..cceaa34fad8c3 100644
--- a/crates/forge/tests/cli/build.rs
+++ b/crates/forge/tests/cli/build.rs
@@ -1,4 +1,5 @@
 use crate::utils::generate_large_init_contract;
+use foundry_compilers::artifacts::EvmVersion;
 use foundry_test_utils::{forgetest, forgetest_init, snapbox::IntoData, str};
 use globset::Glob;
 use std::fs;
@@ -189,6 +190,27 @@ forgetest!(build_sizes_respects_configured_code_size_limit, |prj, cmd| {
     );
 });
 
+forgetest!(build_sizes_respects_amsterdam_code_size_limits, |prj, cmd| {
+    prj.add_source("LargeContract.sol", generate_large_init_contract(50_000).as_str());
+    prj.update_config(|config| {
+        config.evm_version = EvmVersion::Amsterdam;
+    });
+
+    cmd.args(["build", "--sizes", "--json"]).assert_success().stdout_eq(
+        str![[r#"
+{
+  "LargeContract": {
+    "runtime_size": 62,
+    "init_size": 50125,
+    "runtime_margin": 32706,
+    "init_margin": 15411
+  }
+}
+"#]]
+        .is_json(),
+    );
+});
+
 // tests build output is as expected
 forgetest_init!(exact_build_output, |prj, cmd| {
     prj.initialize_default_contracts();
diff --git a/crates/forge/tests/cli/script.rs b/crates/forge/tests/cli/script.rs
index ac2f45c52dfd1..bc2a4e0e375fa 100644
--- a/crates/forge/tests/cli/script.rs
+++ b/crates/forge/tests/cli/script.rs
@@ -9,6 +9,7 @@ use alloy_network::Ethereum;
 use alloy_primitives::{Address, Bytes, U256, address, hex};
 use anvil::{NodeConfig, spawn};
 use forge_script_sequence::ScriptSequence;
+use foundry_compilers::artifacts::EvmVersion;
 use foundry_test_utils::{
     ScriptOutcome, ScriptTester,
     rpc::{self, next_http_archive_rpc_url},
@@ -4054,6 +4055,32 @@ Error: `LargeRuntime` is above the contract size limit ([..] > 24576).
 "#]]);
 });
 
+forgetest_async!(script_check_contract_sizes_uses_amsterdam_code_size_limit, |prj, cmd| {
+    foundry_test_utils::util::initialize(prj.root());
+    write_large_runtime_deploy_script(&prj, 25_000);
+    prj.update_config(|config| {
+        config.evm_version = EvmVersion::Amsterdam;
+    });
+
+    let (_api, handle) = spawn(NodeConfig::test().with_gas_limit(Some(1_000_000_000))).await;
+    cmd.set_current_dir(prj.root());
+    for var in ["FOUNDRY_CODE_SIZE_LIMIT", "DAPP_CODE_SIZE_LIMIT", "DAPP_TEST_CODE_SIZE_LIMIT"] {
+        cmd.unset_env(var);
+    }
+    let assert = cmd
+        .args([
+            "script",
+            "DeployLarge",
+            "--rpc-url",
+            &handle.http_endpoint(),
+            "--gas-limit",
+            "1000000000",
+        ])
+        .assert_success();
+    let stderr = String::from_utf8_lossy(&assert.get_output().stderr);
+    assert!(!stderr.contains("above the contract size limit"), "{stderr}");
+});
+
 // Tests that `forge script` honors `code_size_limit` configured via foundry.toml
 // (the bug fix: previously only the CLI flag was honored).
 forgetest_async!(script_check_contract_sizes_honors_config_limit, |prj, cmd| {
diff --git a/crates/script/src/lib.rs b/crates/script/src/lib.rs
index 1d0c57ead7a3a..c68cafad7a4e5 100644
--- a/crates/script/src/lib.rs
+++ b/crates/script/src/lib.rs
@@ -454,7 +454,11 @@ impl ScriptArgs {
                 .code_size_limit
                 .or(pre_simulation.script_config.config.code_size_limit)
                 .map(ContractSizeLimits::with_runtime_limit)
-                .unwrap_or_default();
+                .unwrap_or_else(|| {
+                    ContractSizeLimits::for_spec_id(
+                        pre_simulation.script_config.config.evm_spec_id(),
+                    )
+                });
             pre_simulation.args.check_contract_sizes(
                 size_limits,
                 &pre_simulation.execution_result,
@@ -565,8 +569,8 @@ impl ScriptArgs {
         Ok((func.clone(), data.into()))
     }
 
-    /// Checks if the transaction is a deployment with either a size above the default contract size
-    /// limit or specified `code_size_limit`.
+    /// Checks if the transaction is a deployment with a size above the active EVM specification's
+    /// contract size limit or the specified `code_size_limit`.
     ///
     /// If `self.broadcast` is enabled, it asks confirmation of the user. Otherwise, it just warns
     /// the user.