diff --git a/barretenberg/cpp/src/barretenberg/vm/aztec_constants.hpp b/barretenberg/cpp/src/barretenberg/vm/aztec_constants.hpp
index a0297450023..24d69635058 100644
--- a/barretenberg/cpp/src/barretenberg/vm/aztec_constants.hpp
+++ b/barretenberg/cpp/src/barretenberg/vm/aztec_constants.hpp
@@ -82,7 +82,7 @@
 #define START_EMIT_NULLIFIER_WRITE_OFFSET 208
 #define START_EMIT_L2_TO_L1_MSG_WRITE_OFFSET 224
 #define START_EMIT_UNENCRYPTED_LOG_WRITE_OFFSET 226
-#define MAX_L2_GAS_PER_TX_PUBLIC_PORTION 12000000
+#define MAX_L2_GAS_PER_TX_PUBLIC_PORTION 6000000
 #define AVM_POSEIDON2_BASE_L2_GAS 36
 #define AVM_ADD_BASE_L2_GAS 27
 #define AVM_SUB_BASE_L2_GAS 27
diff --git a/docs/docs/migration_notes.md b/docs/docs/migration_notes.md
index 2b096d8899c..f2a713587d9 100644
--- a/docs/docs/migration_notes.md
+++ b/docs/docs/migration_notes.md
@@ -8,6 +8,10 @@ Aztec is in full-speed development. Literally every version breaks compatibility
 
 ## TBD
 
+### L2 Gas limit of 6M enforced for public portion of TX
+
+A 12M limit was previously enforced per-enqueued-public-call. The protocol now enforces a stricter limit that the entire public portion of a transaction consumes at most 6,000,000 L2 gas. 
+
 ### [aztec.nr] Renamed `Header` and associated helpers
 
 The `Header` struct has been renamed to `BlockHeader`, and the `get_header()` family of functions have been similarly renamed to `get_block_header()`.
@@ -44,10 +48,6 @@ Further changes are planned, so that:
 
 ## 0.66
 
-### L2 Gas limit of 12M enforced for public portion of TX
-
-This limit was previously enforced per-enqueued-public-call. The protocol now enforces a stricter limit that the entire public portion of a transaction consumes at most 12,000,000 L2 gas. 
-
 ### DEBUG env var is removed
 
 The `DEBUG` variable is no longer used. Use `LOG_LEVEL` with one of `silent`, `fatal`, `error`, `warn`, `info`, `verbose`, `debug`, or `trace`. To tweak log levels per module, add a list of module prefixes with their overridden level. For example, LOG_LEVEL="info; verbose: aztec:sequencer, aztec:archiver; debug: aztec:kv-store" sets `info` as the default log level, `verbose` for the sequencer and archiver, and `debug` for the kv-store. Module name match is done by prefix.
diff --git a/l1-contracts/src/core/libraries/ConstantsGen.sol b/l1-contracts/src/core/libraries/ConstantsGen.sol
index ce952a6fb6d..f9a9435bf8b 100644
--- a/l1-contracts/src/core/libraries/ConstantsGen.sol
+++ b/l1-contracts/src/core/libraries/ConstantsGen.sol
@@ -251,9 +251,8 @@ library Constants {
   uint256 internal constant START_EMIT_L2_TO_L1_MSG_WRITE_OFFSET = 224;
   uint256 internal constant START_EMIT_UNENCRYPTED_LOG_WRITE_OFFSET = 226;
   uint256 internal constant DEFAULT_GAS_LIMIT = 1000000000;
-  uint256 internal constant DEFAULT_TEARDOWN_GAS_LIMIT = 12000000;
-  uint256 internal constant MAX_L2_GAS_PER_TX_PUBLIC_PORTION = 12000000;
-  uint256 internal constant MAX_L2_GAS_PER_ENQUEUED_CALL = 12000000;
+  uint256 internal constant MAX_L2_GAS_PER_TX_PUBLIC_PORTION = 6000000;
+  uint256 internal constant DEFAULT_TEARDOWN_GAS_LIMIT = 6000000;
   uint256 internal constant DA_BYTES_PER_FIELD = 32;
   uint256 internal constant DA_GAS_PER_BYTE = 16;
   uint256 internal constant FIXED_DA_GAS = 512;
diff --git a/noir-projects/noir-protocol-circuits/crates/types/src/constants.nr b/noir-projects/noir-protocol-circuits/crates/types/src/constants.nr
index 7dd7fa27906..bb754d4a9ad 100644
--- a/noir-projects/noir-protocol-circuits/crates/types/src/constants.nr
+++ b/noir-projects/noir-protocol-circuits/crates/types/src/constants.nr
@@ -582,9 +582,8 @@ pub global START_EMIT_UNENCRYPTED_LOG_WRITE_OFFSET: u32 =
 
 // GAS DEFAULTS
 pub global DEFAULT_GAS_LIMIT: u32 = 1_000_000_000;
-pub global DEFAULT_TEARDOWN_GAS_LIMIT: u32 = 12_000_000;
-pub global MAX_L2_GAS_PER_TX_PUBLIC_PORTION: u32 = 12_000_000;
-pub global MAX_L2_GAS_PER_ENQUEUED_CALL: u32 = 12_000_000;
+pub global MAX_L2_GAS_PER_TX_PUBLIC_PORTION: u32 = 6_000_000;
+pub global DEFAULT_TEARDOWN_GAS_LIMIT: u32 = MAX_L2_GAS_PER_TX_PUBLIC_PORTION;
 pub global DA_BYTES_PER_FIELD: u32 = 32;
 pub global DA_GAS_PER_BYTE: u32 = 16;
 // pays for preamble information in TX Effects
diff --git a/yarn-project/circuits.js/src/constants.gen.ts b/yarn-project/circuits.js/src/constants.gen.ts
index fd9eea48da4..eeb86040682 100644
--- a/yarn-project/circuits.js/src/constants.gen.ts
+++ b/yarn-project/circuits.js/src/constants.gen.ts
@@ -235,9 +235,8 @@ export const START_EMIT_NULLIFIER_WRITE_OFFSET = 208;
 export const START_EMIT_L2_TO_L1_MSG_WRITE_OFFSET = 224;
 export const START_EMIT_UNENCRYPTED_LOG_WRITE_OFFSET = 226;
 export const DEFAULT_GAS_LIMIT = 1000000000;
-export const DEFAULT_TEARDOWN_GAS_LIMIT = 12000000;
-export const MAX_L2_GAS_PER_TX_PUBLIC_PORTION = 12000000;
-export const MAX_L2_GAS_PER_ENQUEUED_CALL = 12000000;
+export const MAX_L2_GAS_PER_TX_PUBLIC_PORTION = 6000000;
+export const DEFAULT_TEARDOWN_GAS_LIMIT = 6000000;
 export const DA_BYTES_PER_FIELD = 32;
 export const DA_GAS_PER_BYTE = 16;
 export const FIXED_DA_GAS = 512;