diff --git a/charmcraft.yaml b/charmcraft.yaml
index c7a2338..c1b609d 100644
--- a/charmcraft.yaml
+++ b/charmcraft.yaml
@@ -11,6 +11,11 @@ bases:
     - name: "ubuntu"
       channel: "22.04"
       architectures: ["amd64"]
+  - build-on:
+    - name: "ubuntu"
+      channel: "20.04"
+      architectures: ["amd64"]
+    run-on:
     - name: "ubuntu"
       channel: "20.04"
       architectures: ["amd64"]
diff --git a/tests/integration/test_juju_info.py b/tests/integration/test_juju_info.py
index ed06b9d..40a3e21 100644
--- a/tests/integration/test_juju_info.py
+++ b/tests/integration/test_juju_info.py
@@ -40,9 +40,16 @@ async def test_build_and_deploy(ops_test: OpsTest, grafana_agent_charm):
     await ops_test.model.deploy(
         principal.charm, application_name=principal.name, num_units=2, series="jammy"
     )
+
+    # Workaround: `charmcraft pack` produces two files, but `ops_test.build_charm` returns the
+    # first one. Since primary is jammy, we know we need to deploy the jammy grafana agent charm,
+    # otherwise we'd get an error such as:
+    #   ImportError: libssl.so.1.1: cannot open shared object file: No such file or directory
+    jammy_charm_path = grafana_agent_charm.parent / "grafana-agent_ubuntu-22.04-amd64.charm"
+
     # Subordinate
     await ops_test.model.deploy(
-        grafana_agent_charm, application_name=agent.name, num_units=0, series="jammy"
+        jammy_charm_path, application_name=agent.name, num_units=0, series="jammy"
     )
 
     # Placeholder for o11y relations (otherwise grafana agent charm is in blocked status)
diff --git a/tox.ini b/tox.ini
index ae6a150..3d4267b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -96,7 +96,9 @@ deps =
     juju ~= 3.1.0
     pytest
     prometheus-api-client
-    pytest-operator
+    #pytest-operator
+    # https://github.com/charmed-kubernetes/pytest-operator/pull/115
+    pytest-operator @ git+https://github.com/sed-i/pytest-operator@patch-1
 commands =
     pytest -v --tb native --log-cli-level=INFO -s {posargs} {[vars]tst_path}/integration