diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 2120c97fc3..b3fc61ed3b 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -59,6 +59,8 @@ jobs:
             allure_on_amd64: false
           - agent: 3.4.6  # renovate: juju-agent-pin-minor
             allure_on_amd64: true
+          - snap_channel: 3.6/candidate
+            allure_on_amd64: false
         architecture:
           - amd64
         include:
@@ -66,7 +68,11 @@ jobs:
               agent: 3.4.6  # renovate: juju-agent-pin-minor
               allure_on_amd64: true
             architecture: arm64
-    name: Integration | ${{ matrix.juju.agent }} | ${{ matrix.architecture }}
+          - juju:
+              snap_channel: 3.6/candidate
+              allure_on_amd64: false
+            architecture: arm64
+    name: Integration | ${{ matrix.juju.agent || matrix.juju.snap_channel }} | ${{ matrix.architecture }}
     needs:
       - lint
       - unit-test
@@ -78,6 +84,7 @@ jobs:
       cloud: microk8s
       microk8s-snap-channel: 1.31-strict/stable  # renovate: latest microk8s
       juju-agent-version: ${{ matrix.juju.agent }}
+      juju-snap-channel: ${{ matrix.juju.snap_channel }}
       libjuju-version-constraint: ${{ matrix.juju.libjuju }}
       _beta_allure_report: ${{ matrix.juju.allure_on_amd64 && matrix.architecture == 'amd64' }}
     secrets:
diff --git a/tests/integration/ha_tests/test_async_replication.py b/tests/integration/ha_tests/test_async_replication.py
index 91cd0b1bf7..3c5ea5ea09 100644
--- a/tests/integration/ha_tests/test_async_replication.py
+++ b/tests/integration/ha_tests/test_async_replication.py
@@ -18,6 +18,7 @@
 from .. import architecture, markers
 from ..helpers import (
     APPLICATION_NAME,
+    CHARM_BASE,
     DATABASE_APP_NAME,
     build_and_deploy,
     get_leader_unit,
@@ -112,8 +113,12 @@ async def test_deploy_async_replication_setup(
     """Build and deploy two PostgreSQL cluster in two separate models to test async replication."""
     await build_and_deploy(ops_test, CLUSTER_SIZE, wait_for_idle=False)
     await build_and_deploy(ops_test, CLUSTER_SIZE, wait_for_idle=False, model=second_model)
-    await ops_test.model.deploy(APPLICATION_NAME, channel="latest/edge", num_units=1)
-    await second_model.deploy(APPLICATION_NAME, channel="latest/edge", num_units=1)
+    await ops_test.model.deploy(
+        APPLICATION_NAME, channel="latest/edge", num_units=1, base=CHARM_BASE
+    )
+    await second_model.deploy(
+        APPLICATION_NAME, channel="latest/edge", num_units=1, base=CHARM_BASE
+    )
 
     async with ops_test.fast_forward(), fast_forward(second_model):
         await gather(
diff --git a/tests/integration/ha_tests/test_replication.py b/tests/integration/ha_tests/test_replication.py
index 33ed3ed66b..fcc88cd1d8 100644
--- a/tests/integration/ha_tests/test_replication.py
+++ b/tests/integration/ha_tests/test_replication.py
@@ -9,7 +9,7 @@
 
 from ..helpers import (
     APPLICATION_NAME,
-    CHARM_SERIES,
+    CHARM_BASE,
     app_name,
     build_and_deploy,
     db_connect,
@@ -43,7 +43,7 @@ async def test_build_and_deploy(ops_test: OpsTest) -> None:
             await ops_test.model.deploy(
                 APPLICATION_NAME,
                 application_name=APPLICATION_NAME,
-                series=CHARM_SERIES,
+                base=CHARM_BASE,
                 channel="edge",
             )
 
diff --git a/tests/integration/ha_tests/test_rollback_to_master_label.py b/tests/integration/ha_tests/test_rollback_to_master_label.py
index 4bb1ad23f8..8043b4aa8a 100644
--- a/tests/integration/ha_tests/test_rollback_to_master_label.py
+++ b/tests/integration/ha_tests/test_rollback_to_master_label.py
@@ -15,7 +15,7 @@
 from ..architecture import architecture
 from ..helpers import (
     APPLICATION_NAME,
-    CHARM_SERIES,
+    CHARM_BASE,
     DATABASE_APP_NAME,
     get_leader_unit,
     get_primary,
@@ -47,13 +47,14 @@ async def test_deploy_stable(ops_test: OpsTest) -> None:
             num_units=3,
             channel="14/stable",
             revision=LABEL_REVISION,
-            series=CHARM_SERIES,
+            base=CHARM_BASE,
             trust=True,
         ),
         ops_test.model.deploy(
             APPLICATION_NAME,
             num_units=1,
             channel="latest/edge",
+            base=CHARM_BASE,
         ),
     )
     logger.info("Wait for applications to become active")
diff --git a/tests/integration/ha_tests/test_self_healing.py b/tests/integration/ha_tests/test_self_healing.py
index ba59e84764..1afd64239c 100644
--- a/tests/integration/ha_tests/test_self_healing.py
+++ b/tests/integration/ha_tests/test_self_healing.py
@@ -12,7 +12,7 @@
 from .. import markers
 from ..helpers import (
     APPLICATION_NAME,
-    CHARM_SERIES,
+    CHARM_BASE,
     METADATA,
     app_name,
     build_and_deploy,
@@ -69,7 +69,7 @@ async def test_build_and_deploy(ops_test: OpsTest) -> None:
             await ops_test.model.deploy(
                 APPLICATION_NAME,
                 application_name=APPLICATION_NAME,
-                series=CHARM_SERIES,
+                base=CHARM_BASE,
                 channel="edge",
             )
 
diff --git a/tests/integration/ha_tests/test_smoke.py b/tests/integration/ha_tests/test_smoke.py
index 286a403688..9c8fe45efd 100644
--- a/tests/integration/ha_tests/test_smoke.py
+++ b/tests/integration/ha_tests/test_smoke.py
@@ -12,7 +12,7 @@
 
 from .. import markers
 from ..helpers import (
-    CHARM_SERIES,
+    CHARM_BASE,
     DATABASE_APP_NAME,
     scale_application,
 )
@@ -56,7 +56,7 @@ async def test_app_force_removal(ops_test: OpsTest):
             application_name=DATABASE_APP_NAME,
             num_units=1,
             channel="14/stable",
-            series=CHARM_SERIES,
+            base=CHARM_BASE,
             trust=True,
             config={"profile": "testing"},
         )
@@ -169,7 +169,7 @@ async def test_app_resources_conflicts(ops_test: OpsTest):
             application_name=DUP_DATABASE_APP_NAME,
             num_units=1,
             channel="14/stable",
-            series=CHARM_SERIES,
+            base=CHARM_BASE,
             trust=True,
             config={"profile": "testing"},
         )
diff --git a/tests/integration/ha_tests/test_upgrade.py b/tests/integration/ha_tests/test_upgrade.py
index 72c7ccf657..a8f9c2960b 100644
--- a/tests/integration/ha_tests/test_upgrade.py
+++ b/tests/integration/ha_tests/test_upgrade.py
@@ -14,6 +14,7 @@
 
 from ..helpers import (
     APPLICATION_NAME,
+    CHARM_BASE,
     DATABASE_APP_NAME,
     METADATA,
     count_switchovers,
@@ -44,11 +45,13 @@ async def test_deploy_latest(ops_test: OpsTest) -> None:
             channel="14/edge",
             trust=True,
             config={"profile": "testing"},
+            base=CHARM_BASE,
         ),
         ops_test.model.deploy(
             APPLICATION_NAME,
             num_units=1,
             channel="latest/edge",
+            base=CHARM_BASE,
         ),
     )
     logger.info("Wait for applications to become active")
diff --git a/tests/integration/ha_tests/test_upgrade_from_stable.py b/tests/integration/ha_tests/test_upgrade_from_stable.py
index 24e5d920af..ac221930e1 100644
--- a/tests/integration/ha_tests/test_upgrade_from_stable.py
+++ b/tests/integration/ha_tests/test_upgrade_from_stable.py
@@ -13,6 +13,7 @@
 from .. import markers
 from ..helpers import (
     APPLICATION_NAME,
+    CHARM_BASE,
     DATABASE_APP_NAME,
     METADATA,
     count_switchovers,
@@ -42,11 +43,13 @@ async def test_deploy_stable(ops_test: OpsTest) -> None:
             num_units=3,
             channel="14/stable",
             trust=True,
+            base=CHARM_BASE,
         ),
         ops_test.model.deploy(
             APPLICATION_NAME,
             num_units=1,
             channel="latest/edge",
+            base=CHARM_BASE,
         ),
     )
     logger.info("Wait for applications to become active")
diff --git a/tests/integration/ha_tests/test_upgrade_to_primary_label.py b/tests/integration/ha_tests/test_upgrade_to_primary_label.py
index 48ce47217c..a3835370c1 100644
--- a/tests/integration/ha_tests/test_upgrade_to_primary_label.py
+++ b/tests/integration/ha_tests/test_upgrade_to_primary_label.py
@@ -13,12 +13,14 @@
 from ..architecture import architecture
 from ..helpers import (
     APPLICATION_NAME,
+    CHARM_BASE,
     CHARM_SERIES,
     DATABASE_APP_NAME,
     get_leader_unit,
     get_primary,
     get_unit_by_index,
 )
+from ..juju_ import juju_major_version
 from .helpers import (
     are_writes_increasing,
     check_writes,
@@ -36,19 +38,26 @@
 @pytest.mark.abort_on_fail
 async def test_deploy_stable(ops_test: OpsTest) -> None:
     """Simple test to ensure that the PostgreSQL and application charms get deployed."""
+    database_additional_params = {}
+    if juju_major_version >= 3:
+        database_additional_params["base"] = CHARM_BASE
+    else:
+        database_additional_params["series"] = CHARM_SERIES
+
     await asyncio.gather(
         ops_test.model.deploy(
             DATABASE_APP_NAME,
             num_units=3,
             channel="14/stable",
             revision=(280 if architecture == "arm64" else 281),
-            series=CHARM_SERIES,
             trust=True,
+            **database_additional_params,
         ),
         ops_test.model.deploy(
             APPLICATION_NAME,
             num_units=1,
             channel="latest/edge",
+            base=CHARM_BASE,
         ),
     )
     logger.info("Wait for applications to become active")
diff --git a/tests/integration/helpers.py b/tests/integration/helpers.py
index f44d695464..9a0c4c5c0c 100644
--- a/tests/integration/helpers.py
+++ b/tests/integration/helpers.py
@@ -33,6 +33,7 @@
     wait_fixed,
 )
 
+CHARM_BASE = "ubuntu@22.04"
 CHARM_SERIES = "jammy"
 METADATA = yaml.safe_load(Path("./metadata.yaml").read_text())
 DATABASE_APP_NAME = METADATA["name"]
@@ -100,7 +101,7 @@ async def build_and_deploy(
             application_name=database_app_name,
             trust=True,
             num_units=num_units,
-            series=CHARM_SERIES,
+            base=CHARM_BASE,
             config={"profile": "testing"},
         ),
     )
@@ -277,6 +278,7 @@ async def deploy_and_relate_application_with_postgresql(
     channel: str = "stable",
     relation: str = "db",
     status: str = "blocked",
+    base: str = CHARM_BASE,
 ) -> int:
     """Helper function to deploy and relate application with PostgreSQL.
 
@@ -289,6 +291,7 @@ async def deploy_and_relate_application_with_postgresql(
         relation: Name of the PostgreSQL relation to relate
             the application to.
         status: The status to wait for in the application (default: blocked).
+        base: The base of the charm to deploy
 
     Returns:
         the id of the created relation.
@@ -299,6 +302,7 @@ async def deploy_and_relate_application_with_postgresql(
         channel=channel,
         application_name=application_name,
         num_units=number_of_units,
+        base=base,
     )
     await ops_test.model.wait_for_idle(
         apps=[application_name],
@@ -837,8 +841,10 @@ async def backup_operations(
 ) -> None:
     """Basic set of operations for backup testing in different cloud providers."""
     # Deploy S3 Integrator and TLS Certificates Operator.
-    await ops_test.model.deploy(s3_integrator_app_name)
-    await ops_test.model.deploy(tls_certificates_app_name, config=tls_config, channel=tls_channel)
+    await ops_test.model.deploy(s3_integrator_app_name, base=CHARM_BASE)
+    await ops_test.model.deploy(
+        tls_certificates_app_name, config=tls_config, channel=tls_channel, base=CHARM_BASE
+    )
     # Deploy and relate PostgreSQL to S3 integrator (one database app for each cloud for now
     # as archivo_mode is disabled after restoring the backup) and to TLS Certificates Operator
     # (to be able to create backups from replicas).
diff --git a/tests/integration/new_relations/test_new_relations.py b/tests/integration/new_relations/test_new_relations.py
index 5f9e218879..61bcbfdaa4 100644
--- a/tests/integration/new_relations/test_new_relations.py
+++ b/tests/integration/new_relations/test_new_relations.py
@@ -16,7 +16,7 @@
 
 from .. import markers
 from ..helpers import (
-    CHARM_SERIES,
+    CHARM_BASE,
     check_database_users_existence,
     scale_application,
 )
@@ -56,7 +56,7 @@ async def test_database_relation_with_charm_libraries(ops_test: OpsTest, databas
                 APPLICATION_APP_NAME,
                 application_name=APPLICATION_APP_NAME,
                 num_units=2,
-                series=CHARM_SERIES,
+                base=CHARM_BASE,
                 channel="edge",
             ),
             ops_test.model.deploy(
@@ -68,7 +68,7 @@ async def test_database_relation_with_charm_libraries(ops_test: OpsTest, databas
                 },
                 application_name=DATABASE_APP_NAME,
                 num_units=3,
-                series=CHARM_SERIES,
+                base=CHARM_BASE,
                 trust=True,
                 config={"profile": "testing"},
             ),
@@ -81,7 +81,7 @@ async def test_database_relation_with_charm_libraries(ops_test: OpsTest, databas
                 },
                 application_name=ANOTHER_DATABASE_APP_NAME,
                 num_units=3,
-                series=CHARM_SERIES,
+                base=CHARM_BASE,
                 trust=True,
                 config={"profile": "testing"},
             ),
@@ -196,7 +196,7 @@ async def test_two_applications_doesnt_share_the_same_relation_data(ops_test: Op
     await ops_test.model.deploy(
         APPLICATION_APP_NAME,
         application_name=another_application_app_name,
-        series=CHARM_SERIES,
+        base=CHARM_BASE,
         channel="edge",
     )
     await ops_test.model.wait_for_idle(apps=all_app_names, status="active")
@@ -453,7 +453,7 @@ async def test_admin_role(ops_test: OpsTest):
     all_app_names = [DATA_INTEGRATOR_APP_NAME]
     all_app_names.extend(APP_NAMES)
     async with ops_test.fast_forward():
-        await ops_test.model.deploy(DATA_INTEGRATOR_APP_NAME)
+        await ops_test.model.deploy(DATA_INTEGRATOR_APP_NAME, base=CHARM_BASE)
         await ops_test.model.wait_for_idle(apps=[DATA_INTEGRATOR_APP_NAME], status="blocked")
         await ops_test.model.applications[DATA_INTEGRATOR_APP_NAME].set_config({
             "database-name": DATA_INTEGRATOR_APP_NAME.replace("-", "_"),
@@ -542,7 +542,9 @@ async def test_invalid_extra_user_roles(ops_test: OpsTest):
         another_data_integrator_app_name = f"another-{DATA_INTEGRATOR_APP_NAME}"
         data_integrator_apps_names = [DATA_INTEGRATOR_APP_NAME, another_data_integrator_app_name]
         await ops_test.model.deploy(
-            DATA_INTEGRATOR_APP_NAME, application_name=another_data_integrator_app_name
+            DATA_INTEGRATOR_APP_NAME,
+            application_name=another_data_integrator_app_name,
+            base=CHARM_BASE,
         )
         await ops_test.model.wait_for_idle(
             apps=[another_data_integrator_app_name], status="blocked"
@@ -607,7 +609,7 @@ async def test_database_deploy_clientapps(ops_test: OpsTest, database_charm):
                 },
                 application_name=DATABASE_APP_NAME,
                 num_units=3,
-                series=CHARM_SERIES,
+                base=CHARM_BASE,
                 trust=True,
                 config={"profile": "testing"},
             ),
@@ -628,7 +630,7 @@ async def test_discourse(ops_test: OpsTest):
     await gather(
         ops_test.model.deploy(DISCOURSE_APP_NAME, application_name=DISCOURSE_APP_NAME),
         ops_test.model.deploy(
-            REDIS_APP_NAME, application_name=REDIS_APP_NAME, channel="latest/edge"
+            REDIS_APP_NAME, application_name=REDIS_APP_NAME, channel="latest/edge", base=CHARM_BASE
         ),
     )
 
@@ -705,12 +707,17 @@ async def test_indico_datatabase(ops_test: OpsTest) -> None:
     async with ops_test.fast_forward(fast_interval="30s"):
         await ops_test.model.deploy(
             "indico",
-            channel="stable",
+            channel="latest/edge",
             application_name="indico",
             num_units=1,
+            series="focal",
+        )
+        await ops_test.model.deploy(
+            "redis-k8s", channel="stable", application_name="redis-broker", base="ubuntu@20.04"
+        )
+        await ops_test.model.deploy(
+            "redis-k8s", channel="stable", application_name="redis-cache", base="ubuntu@20.04"
         )
-        await ops_test.model.deploy("redis-k8s", channel="stable", application_name="redis-broker")
-        await ops_test.model.deploy("redis-k8s", channel="stable", application_name="redis-cache")
         await asyncio.gather(
             ops_test.model.relate("redis-broker", "indico:redis-broker"),
             ops_test.model.relate("redis-cache", "indico:redis-cache"),
diff --git a/tests/integration/new_relations/test_relations_coherence.py b/tests/integration/new_relations/test_relations_coherence.py
index 4dc301bdd3..aa489473d1 100644
--- a/tests/integration/new_relations/test_relations_coherence.py
+++ b/tests/integration/new_relations/test_relations_coherence.py
@@ -9,7 +9,7 @@
 import pytest
 from pytest_operator.plugin import OpsTest
 
-from ..helpers import DATABASE_APP_NAME, build_and_deploy
+from ..helpers import CHARM_BASE, DATABASE_APP_NAME, build_and_deploy
 from .helpers import build_connection_string
 from .test_new_relations import DATA_INTEGRATOR_APP_NAME
 
@@ -30,7 +30,7 @@ async def test_relations(ops_test: OpsTest, database_charm):
         await ops_test.model.wait_for_idle(apps=[DATABASE_APP_NAME], status="active", timeout=3000)
 
         # Creating first time relation with user role
-        await ops_test.model.deploy(DATA_INTEGRATOR_APP_NAME)
+        await ops_test.model.deploy(DATA_INTEGRATOR_APP_NAME, base=CHARM_BASE)
         await ops_test.model.applications[DATA_INTEGRATOR_APP_NAME].set_config({
             "database-name": DATA_INTEGRATOR_APP_NAME.replace("-", "_"),
         })
diff --git a/tests/integration/relations/test_relations.py b/tests/integration/relations/test_relations.py
index ccab3b6f3d..0d33cf38ee 100644
--- a/tests/integration/relations/test_relations.py
+++ b/tests/integration/relations/test_relations.py
@@ -7,7 +7,7 @@
 import pytest
 from pytest_operator.plugin import OpsTest
 
-from ..helpers import CHARM_SERIES
+from ..helpers import CHARM_BASE
 from ..new_relations.test_new_relations import (
     APPLICATION_APP_NAME,
     DATABASE_APP_METADATA,
@@ -34,7 +34,7 @@ async def test_deploy_charms(ops_test: OpsTest, database_charm):
                 APPLICATION_APP_NAME,
                 application_name=APPLICATION_APP_NAME,
                 num_units=1,
-                series=CHARM_SERIES,
+                base=CHARM_BASE,
                 channel="edge",
             ),
             ops_test.model.deploy(
@@ -46,7 +46,7 @@ async def test_deploy_charms(ops_test: OpsTest, database_charm):
                 },
                 application_name=APP_NAME,
                 num_units=1,
-                series=CHARM_SERIES,
+                base=CHARM_BASE,
                 config={
                     "profile": "testing",
                     "plugin_unaccent_enable": "True",
diff --git a/tests/integration/test_charm.py b/tests/integration/test_charm.py
index d1dfdec2b9..ea74ab3166 100644
--- a/tests/integration/test_charm.py
+++ b/tests/integration/test_charm.py
@@ -14,7 +14,7 @@
 from tenacity import Retrying, stop_after_delay, wait_fixed
 
 from .helpers import (
-    CHARM_SERIES,
+    CHARM_BASE,
     METADATA,
     STORAGE_PATH,
     build_and_deploy,
@@ -388,7 +388,7 @@ async def test_redeploy_charm_same_model(ops_test: OpsTest):
             },
             application_name=APP_NAME,
             num_units=len(UNIT_IDS),
-            series=CHARM_SERIES,
+            base=CHARM_BASE,
             trust=True,
             config={"profile": "testing"},
         )
@@ -432,7 +432,7 @@ async def test_redeploy_charm_same_model_after_forcing_removal(ops_test: OpsTest
             },
             application_name=APP_NAME,
             num_units=len(UNIT_IDS),
-            series=CHARM_SERIES,
+            base=CHARM_BASE,
             trust=True,
             config={"profile": "testing"},
         )
@@ -464,7 +464,7 @@ async def test_storage_with_more_restrictive_permissions(ops_test: OpsTest):
                 },
                 application_name=app_name,
                 num_units=1,
-                series=CHARM_SERIES,
+                base=CHARM_BASE,
                 trust=True,
                 config={"profile": "testing"},
             )
diff --git a/tests/integration/test_db.py b/tests/integration/test_db.py
index f266174bc5..658aa6b713 100644
--- a/tests/integration/test_db.py
+++ b/tests/integration/test_db.py
@@ -10,7 +10,7 @@
 from . import markers
 from .helpers import (
     APPLICATION_NAME,
-    CHARM_SERIES,
+    CHARM_BASE,
     DATABASE_APP_NAME,
     build_and_deploy,
     check_database_creation,
@@ -51,7 +51,12 @@ async def test_finos_waltz_db(ops_test: OpsTest) -> None:
 
         # Deploy and test the first deployment of Finos Waltz.
         relation_id = await deploy_and_relate_application_with_postgresql(
-            ops_test, "finos-waltz-k8s", FINOS_WALTZ_APP_NAME, APPLICATION_UNITS, channel="edge"
+            ops_test,
+            "finos-waltz-k8s",
+            FINOS_WALTZ_APP_NAME,
+            APPLICATION_UNITS,
+            channel="edge",
+            base="ubuntu@20.04",
         )
         await check_database_creation(ops_test, "waltz")
 
@@ -66,6 +71,7 @@ async def test_finos_waltz_db(ops_test: OpsTest) -> None:
             ANOTHER_FINOS_WALTZ_APP_NAME,
             APPLICATION_UNITS,
             channel="edge",
+            base="ubuntu@20.04",
         )
         # In this case, the database name is the same as in the first deployment
         # because it's a fixed value in Finos Waltz charm.
@@ -107,13 +113,13 @@ async def test_extensions_blocking(ops_test: OpsTest) -> None:
     await ops_test.model.deploy(
         APPLICATION_NAME,
         application_name=APPLICATION_NAME,
-        series=CHARM_SERIES,
+        base=CHARM_BASE,
         channel="edge",
     )
     await ops_test.model.deploy(
         APPLICATION_NAME,
         application_name=f"{APPLICATION_NAME}2",
-        series=CHARM_SERIES,
+        base=CHARM_BASE,
         channel="edge",
     )
 
diff --git a/tests/integration/test_db_admin.py b/tests/integration/test_db_admin.py
index 6d023331d8..8d1a5c94fa 100644
--- a/tests/integration/test_db_admin.py
+++ b/tests/integration/test_db_admin.py
@@ -30,7 +30,9 @@ async def test_discourse_from_discourse_charmers(ops_test: OpsTest):
     async with ops_test.fast_forward():
         await asyncio.gather(
             build_and_deploy(ops_test, DATABASE_UNITS),
-            ops_test.model.deploy(REDIS_APP_NAME, application_name=REDIS_APP_NAME),
+            ops_test.model.deploy(
+                REDIS_APP_NAME, application_name=REDIS_APP_NAME, base="ubuntu@20.04"
+            ),
         )
         await ops_test.model.wait_for_idle(
             apps=[DATABASE_APP_NAME, REDIS_APP_NAME], status="active", timeout=1500
diff --git a/tests/integration/test_tls.py b/tests/integration/test_tls.py
index 0b49d95ea2..5ca5d9f373 100644
--- a/tests/integration/test_tls.py
+++ b/tests/integration/test_tls.py
@@ -13,6 +13,7 @@
     change_patroni_setting,
 )
 from .helpers import (
+    CHARM_BASE,
     DATABASE_APP_NAME,
     build_and_deploy,
     check_database_creation,
@@ -83,7 +84,7 @@ async def test_tls(ops_test: OpsTest) -> None:
     async with ops_test.fast_forward():
         # Deploy TLS Certificates operator.
         await ops_test.model.deploy(
-            tls_certificates_app_name, config=tls_config, channel=tls_channel
+            tls_certificates_app_name, config=tls_config, channel=tls_channel, base=CHARM_BASE
         )
         # Relate it to the PostgreSQL to enable TLS.
         await ops_test.model.relate(DATABASE_APP_NAME, tls_certificates_app_name)
@@ -191,7 +192,12 @@ async def test_mattermost_db(ops_test: OpsTest) -> None:
     async with ops_test.fast_forward():
         # Deploy and check Mattermost user and database existence.
         relation_id = await deploy_and_relate_application_with_postgresql(
-            ops_test, "mattermost-k8s", MATTERMOST_APP_NAME, APPLICATION_UNITS, status="waiting"
+            ops_test,
+            "mattermost-k8s",
+            MATTERMOST_APP_NAME,
+            APPLICATION_UNITS,
+            status="waiting",
+            base="ubuntu@20.04",
         )
         await check_database_creation(ops_test, "mattermost")
 
diff --git a/tests/integration/test_trust.py b/tests/integration/test_trust.py
index ca26e03770..8de2491ed8 100644
--- a/tests/integration/test_trust.py
+++ b/tests/integration/test_trust.py
@@ -10,6 +10,7 @@
 from pytest_operator.plugin import OpsTest
 
 from .helpers import (
+    CHARM_BASE,
     KUBECTL,
     METADATA,
     get_leader_unit,
@@ -96,6 +97,7 @@ async def test_deploy_without_trust(ops_test: OpsTest, database_charm):
         application_name=APP_NAME,
         num_units=3,
         trust=False,
+        base=CHARM_BASE,
     )
 
     await ops_test.model.block_until(
diff --git a/tests/integration/test_wrong_arch.py b/tests/integration/test_wrong_arch.py
index 9cfcbcbb45..e05456e7a5 100644
--- a/tests/integration/test_wrong_arch.py
+++ b/tests/integration/test_wrong_arch.py
@@ -12,7 +12,7 @@
 from pytest_operator.plugin import OpsTest
 
 from . import markers
-from .helpers import CHARM_SERIES, DATABASE_APP_NAME, METADATA
+from .helpers import CHARM_BASE, DATABASE_APP_NAME, METADATA
 
 logger = logging.getLogger(__name__)
 
@@ -47,7 +47,7 @@ async def test_arm_charm_on_amd_host(ops_test: OpsTest) -> None:
         application_name=DATABASE_APP_NAME,
         trust=True,
         num_units=1,
-        series=CHARM_SERIES,
+        base=CHARM_BASE,
         config={"profile": "testing"},
     )
 
@@ -70,7 +70,7 @@ async def test_amd_charm_on_arm_host(ops_test: OpsTest) -> None:
         application_name=DATABASE_APP_NAME,
         trust=True,
         num_units=1,
-        series=CHARM_SERIES,
+        base=CHARM_BASE,
         config={"profile": "testing"},
     )