diff --git a/nucypher/blockchain/eth/sol/source/contracts/StakingEscrow.sol b/nucypher/blockchain/eth/sol/source/contracts/StakingEscrow.sol
index 2fa8aca37..5f46e6450 100644
--- a/nucypher/blockchain/eth/sol/source/contracts/StakingEscrow.sol
+++ b/nucypher/blockchain/eth/sol/source/contracts/StakingEscrow.sol
@@ -1811,7 +1811,7 @@ contract StakingEscrow is Issuer, IERC900History {
     function finishUpgrade(address _target) public override virtual {
         super.finishUpgrade(_target);
         // Create fake period
-//        _lockedPerPeriod[RESERVED_PERIOD] = 111;
+        _lockedPerPeriod[RESERVED_PERIOD] = 111;
 
         // Create fake worker
         stakerFromWorker[address(0)] = address(this);
diff --git a/tests/acceptance/blockchain/deployers/test_deployers_during_migration.py b/tests/acceptance/blockchain/deployers/test_deployers_during_migration.py
new file mode 100644
index 000000000..493493464
--- /dev/null
+++ b/tests/acceptance/blockchain/deployers/test_deployers_during_migration.py
@@ -0,0 +1,112 @@
+"""
+This file is part of nucypher.
+
+nucypher is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+nucypher is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with nucypher.  If not, see <https://www.gnu.org/licenses/>.
+"""
+import pytest
+
+from constant_sorrow import constants
+
+from constant_sorrow.constants import BARE
+from nucypher.blockchain.economics import StandardTokenEconomics
+
+from nucypher.blockchain.eth.agents import ContractAgency, StakingEscrowAgent, PolicyManagerAgent
+from nucypher.blockchain.eth.deployers import (StakingEscrowDeployer, PolicyManagerDeployer)
+
+
+@pytest.fixture(scope="module")
+def new_token_economics(token_economics):
+    economics = StandardTokenEconomics(former_hours_per_period=token_economics.hours_per_period,
+                                       hours_per_period=2 * token_economics.hours_per_period)
+    return economics
+
+
+@pytest.fixture(scope='module')
+def baseline_deployment(staking_escrow_deployer):
+    staking_escrow_deployer.deploy(deployment_mode=constants.FULL)
+
+
+@pytest.fixture(scope='module')
+def new_staking_escrow_deployer(testerchain, test_registry, new_token_economics):
+    staking_escrow_deployer = StakingEscrowDeployer(registry=test_registry,
+                                                    economics=new_token_economics,
+                                                    deployer_address=testerchain.etherbase_account)
+    return staking_escrow_deployer
+
+
+@pytest.fixture(scope='module')
+def new_policy_manager_deployer(testerchain, test_registry, new_token_economics):
+    policy_manager_deployer = PolicyManagerDeployer(registry=test_registry,
+                                                    economics=new_token_economics,
+                                                    deployer_address=testerchain.etherbase_account)
+    return policy_manager_deployer
+
+
+def test_staking_escrow_preparation(testerchain,
+                                    baseline_deployment,
+                                    token_economics,
+                                    test_registry,
+                                    new_staking_escrow_deployer):
+    new_staking_escrow_deployer.deploy(deployment_mode=constants.BARE, ignore_deployed=True)
+
+    # Data is still old, because there is no upgrade yet
+    staking_agent = ContractAgency.get_agent(StakingEscrowAgent, registry=test_registry)
+    assert staking_agent.contract.functions.secondsPerPeriod().call() == token_economics.seconds_per_period
+    assert staking_agent.contract.functions.formerSecondsPerPeriod().call() == token_economics.seconds_per_period
+
+
+def test_policy_manager_preparation(testerchain,
+                                    token_economics,
+                                    test_registry,
+                                    new_policy_manager_deployer):
+    new_policy_manager_deployer.deploy(deployment_mode=constants.BARE, ignore_deployed=True)
+
+    # Data is still old, because there is no upgrade yet
+    policy_manager_agent = ContractAgency.get_agent(PolicyManagerAgent, registry=test_registry)
+    assert policy_manager_agent.contract.functions.secondsPerPeriod().call() == token_economics.seconds_per_period
+    assert policy_manager_agent.contract.functions.formerSecondsPerPeriod().call() == token_economics.seconds_per_period
+
+
+def test_staking_escrow_migration_upgrade(testerchain,
+                                          test_registry,
+                                          new_token_economics,
+                                          new_staking_escrow_deployer):
+    latest_staking_escrow = testerchain.get_contract_by_name(registry=test_registry,
+                                                             contract_name=new_staking_escrow_deployer.contract_name,
+                                                             enrollment_version='latest')
+
+    new_staking_escrow_deployer.retarget(target_address=latest_staking_escrow.address,
+                                         confirmations=0)
+
+    # Now data must be new
+    staking_agent = ContractAgency.get_agent(StakingEscrowAgent, registry=test_registry)
+    assert staking_agent.contract.functions.secondsPerPeriod().call() == new_token_economics.seconds_per_period
+    assert staking_agent.contract.functions.formerSecondsPerPeriod().call() == new_token_economics.former_seconds_per_period
+
+
+def test_policy_manager_migration_upgrade(testerchain,
+                                          test_registry,
+                                          new_token_economics,
+                                          new_policy_manager_deployer):
+    latest_policy_manager = testerchain.get_contract_by_name(registry=test_registry,
+                                                             contract_name=new_policy_manager_deployer.contract_name,
+                                                             enrollment_version='latest')
+
+    new_policy_manager_deployer.retarget(target_address=latest_policy_manager.address,
+                                         confirmations=0)
+
+    # Now data must be new
+    policy_manager_agent = ContractAgency.get_agent(PolicyManagerAgent, registry=test_registry)
+    assert policy_manager_agent.contract.functions.secondsPerPeriod().call() == new_token_economics.seconds_per_period
+    assert policy_manager_agent.contract.functions.formerSecondsPerPeriod().call() == new_token_economics.former_seconds_per_period
diff --git a/tests/integration/blockchain/test_exact_economics_model.py b/tests/integration/blockchain/test_exact_economics_model.py
index d8ee49348..ab91c0f44 100644
--- a/tests/integration/blockchain/test_exact_economics_model.py
+++ b/tests/integration/blockchain/test_exact_economics_model.py
@@ -88,7 +88,7 @@ def test_exact_economics():
             expected_phase2_coefficient
 
     # After sanity checking, assemble expected test deployment parameters
-    expected_deployment_parameters = (24,       # Hours in single period
+    expected_deployment_parameters = (24,       # Hours of former period duration
                                       24,       # Hours in single period
                                       1053,     # Coefficient which modifies the rate at which the maximum issuance decays (d)
                                       365,      # Numerator of the locking duration coefficient (k1)