diff --git a/src/proto_alpha/lib_parameters/default_parameters.ml b/src/proto_alpha/lib_parameters/default_parameters.ml
index ffa126869c8b37b689eda85b00fe9d449a9aff86..715a10d04904926d688ab5f6bc35302986260540 100644
--- a/src/proto_alpha/lib_parameters/default_parameters.ml
+++ b/src/proto_alpha/lib_parameters/default_parameters.ml
@@ -111,7 +111,7 @@ let constants_mainnet =
        the capability to have two rollups at full speed on
        mainnet (as long as they do not reach scalability
        issues related to proof size). *)
-    tx_rollup_hard_size_limit_per_inbox = 250_000;
+    tx_rollup_hard_size_limit_per_inbox = 500_000;
     tx_rollup_hard_size_limit_per_message = 5_000;
     tx_rollup_commitment_bond = Tez.of_mutez_exn 10_000_000_000L;
     tx_rollup_finality_period;
diff --git a/src/proto_alpha/lib_protocol/raw_context.ml b/src/proto_alpha/lib_protocol/raw_context.ml
index 61fe90896255935329a5b0d2c2602b87e628a7a6..fea789693c661a1299fa3e9fdd84bd3158d89201 100644
--- a/src/proto_alpha/lib_protocol/raw_context.ml
+++ b/src/proto_alpha/lib_protocol/raw_context.ml
@@ -912,7 +912,7 @@ let prepare_first_block ~level ~timestamp ctxt =
                the capability to have two rollups at full speed on
                mainnet (as long as they do not reach scalability
                issues related to proof size). *)
-            tx_rollup_hard_size_limit_per_inbox = 250_000;
+            tx_rollup_hard_size_limit_per_inbox = 500_000;
             tx_rollup_hard_size_limit_per_message = 5_000;
             (* Tickets are transmitted in batches in the
                [Tx_rollup_dispatch_tickets] operation.
diff --git a/src/proto_alpha/lib_protocol/test/integration/operations/test_tx_rollup.ml b/src/proto_alpha/lib_protocol/test/integration/operations/test_tx_rollup.ml
index 505cf75c7b6f57d022c5ea4f00913045f115a486..abcc290ef5eaebd99602401bc45a5f94d6622c4b 100644
--- a/src/proto_alpha/lib_protocol/test/integration/operations/test_tx_rollup.ml
+++ b/src/proto_alpha/lib_protocol/test/integration/operations/test_tx_rollup.ml
@@ -905,7 +905,7 @@ let fill_inbox b tx_rollup contract contents k =
        consumed by an operation. We set a lower (arbitrary) limit to
        be able to reach the size limit of an operation. *)
     Op.tx_rollup_submit_batch
-      ~gas_limit:(Gas.Arith.integral_of_int_exn 100_000)
+      ~gas_limit:(Gas.Arith.integral_of_int_exn 20_000)
       ~counter
       (I i)
       contract
diff --git a/tezt/_regressions/rpc/alpha.client.others.out b/tezt/_regressions/rpc/alpha.client.others.out
index 5bf8f5d891458259ae95a597d693cbc50e9206d6..2a80258643e47f101808ac6d2b302843304e5f37 100644
--- a/tezt/_regressions/rpc/alpha.client.others.out
+++ b/tezt/_regressions/rpc/alpha.client.others.out
@@ -30,7 +30,7 @@ rpc/alpha.client.others.out
     { "numerator": 1, "denominator": 2 }, "cache_script_size": 100000000,
   "cache_stake_distribution_cycles": 8, "cache_sampler_state_cycles": 8,
   "tx_rollup_enable": true, "tx_rollup_origination_size": 4000,
-  "tx_rollup_hard_size_limit_per_inbox": 250000,
+  "tx_rollup_hard_size_limit_per_inbox": 500000,
   "tx_rollup_hard_size_limit_per_message": 5000,
   "tx_rollup_max_withdrawals_per_batch": 15,
   "tx_rollup_commitment_bond": "10000000000",
diff --git a/tezt/_regressions/rpc/alpha.light.others.out b/tezt/_regressions/rpc/alpha.light.others.out
index 17f3fa2d1fb75045013ac30182bfa3f06d7a5ee9..bdb57577fd0574ee88c5d2a1bf59f66bf6c1bccd 100644
--- a/tezt/_regressions/rpc/alpha.light.others.out
+++ b/tezt/_regressions/rpc/alpha.light.others.out
@@ -30,7 +30,7 @@ rpc/alpha.light.others.out
     { "numerator": 1, "denominator": 2 }, "cache_script_size": 100000000,
   "cache_stake_distribution_cycles": 8, "cache_sampler_state_cycles": 8,
   "tx_rollup_enable": true, "tx_rollup_origination_size": 4000,
-  "tx_rollup_hard_size_limit_per_inbox": 250000,
+  "tx_rollup_hard_size_limit_per_inbox": 500000,
   "tx_rollup_hard_size_limit_per_message": 5000,
   "tx_rollup_max_withdrawals_per_batch": 15,
   "tx_rollup_commitment_bond": "10000000000",
diff --git a/tezt/_regressions/rpc/alpha.proxy.others.out b/tezt/_regressions/rpc/alpha.proxy.others.out
index 443ad15fc0fd5bdce7a0d9066e44d6b6d87e8e91..18f289de5bb167224e9b00f43702a783e68407fa 100644
--- a/tezt/_regressions/rpc/alpha.proxy.others.out
+++ b/tezt/_regressions/rpc/alpha.proxy.others.out
@@ -30,7 +30,7 @@ rpc/alpha.proxy.others.out
     { "numerator": 1, "denominator": 2 }, "cache_script_size": 100000000,
   "cache_stake_distribution_cycles": 8, "cache_sampler_state_cycles": 8,
   "tx_rollup_enable": true, "tx_rollup_origination_size": 4000,
-  "tx_rollup_hard_size_limit_per_inbox": 250000,
+  "tx_rollup_hard_size_limit_per_inbox": 500000,
   "tx_rollup_hard_size_limit_per_message": 5000,
   "tx_rollup_max_withdrawals_per_batch": 15,
   "tx_rollup_commitment_bond": "10000000000",
diff --git a/tezt/_regressions/rpc/alpha.proxy_server_data_dir.others.out b/tezt/_regressions/rpc/alpha.proxy_server_data_dir.others.out
index a4dbebe0fdab21cd96d1e08dea3cc21be602bc74..a4bd611488c12b7d7f0dbeb6caf9776cfc1e3b85 100644
--- a/tezt/_regressions/rpc/alpha.proxy_server_data_dir.others.out
+++ b/tezt/_regressions/rpc/alpha.proxy_server_data_dir.others.out
@@ -30,7 +30,7 @@ rpc/alpha.proxy_server_data_dir.others.out
     { "numerator": 1, "denominator": 2 }, "cache_script_size": 100000000,
   "cache_stake_distribution_cycles": 8, "cache_sampler_state_cycles": 8,
   "tx_rollup_enable": true, "tx_rollup_origination_size": 4000,
-  "tx_rollup_hard_size_limit_per_inbox": 250000,
+  "tx_rollup_hard_size_limit_per_inbox": 500000,
   "tx_rollup_hard_size_limit_per_message": 5000,
   "tx_rollup_max_withdrawals_per_batch": 15,
   "tx_rollup_commitment_bond": "10000000000",
diff --git a/tezt/_regressions/rpc/alpha.proxy_server_rpc.others.out b/tezt/_regressions/rpc/alpha.proxy_server_rpc.others.out
index 8deba0be254674e867d45ecfe19b7799775149d0..f667ce0edabd75e930403e3b821d41acb4d1b6d7 100644
--- a/tezt/_regressions/rpc/alpha.proxy_server_rpc.others.out
+++ b/tezt/_regressions/rpc/alpha.proxy_server_rpc.others.out
@@ -30,7 +30,7 @@ rpc/alpha.proxy_server_rpc.others.out
     { "numerator": 1, "denominator": 2 }, "cache_script_size": 100000000,
   "cache_stake_distribution_cycles": 8, "cache_sampler_state_cycles": 8,
   "tx_rollup_enable": true, "tx_rollup_origination_size": 4000,
-  "tx_rollup_hard_size_limit_per_inbox": 250000,
+  "tx_rollup_hard_size_limit_per_inbox": 500000,
   "tx_rollup_hard_size_limit_per_message": 5000,
   "tx_rollup_max_withdrawals_per_batch": 15,
   "tx_rollup_commitment_bond": "10000000000",