diff --git a/charmcraft.yaml b/charmcraft.yaml
index 4968216..c9a0ed7 100644
--- a/charmcraft.yaml
+++ b/charmcraft.yaml
@@ -19,7 +19,15 @@ parts:
       cp -r $CHARMCRAFT_STAGE/* .
 
 bases:
-  - name: ubuntu
-    channel: "20.04"
-    architectures:
-      - amd64
+  - build-on:
+      - name: ubuntu
+        channel: "20.04"
+        architectures:
+          - amd64
+    run-on:
+      - name: ubuntu
+        channel: "20.04"
+        architectures: [amd64, s390x, ppc64el, arm64]
+      - name: ubuntu
+        channel: "22.04"
+        architectures: [amd64, s390x, ppc64el, arm64]
diff --git a/osci.yaml b/osci.yaml
index a0cd125..f6cae66 100644
--- a/osci.yaml
+++ b/osci.yaml
@@ -1,7 +1,7 @@
 - project:
     templates:
       - charm-unit-jobs-py38
-      - charm-unit-jobs-py39
+      - charm-unit-jobs-py310
       - charm-xena-functional-jobs
       - charm-yoga-functional-jobs
     vars:
diff --git a/requirements.txt b/requirements.txt
index a68620f..7755b95 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,9 +8,16 @@
 # requirements.txt
 setuptools<50.0.0  # https://github.com/pypa/setuptools/commit/04e3df22df840c6bb244e9b27bc56750c44b7c85
 
+# NOTE: newer versions of cryptography require a Rust compiler to build,
+# see
+# * https://github.com/openstack-charmers/zaza/issues/421
+# * https://mail.python.org/pipermail/cryptography-dev/2021-January/001003.html
+#
+cryptography<3.4
+
 # Build requirements
 cffi==1.14.6; python_version < '3.6'  # cffi 1.15.0 drops support for py35.
-charm-tools==2.8.3
+git+https://github.com/juju/charm-tools#egg=charm-tools
 
 simplejson
 
diff --git a/src/metadata.yaml b/src/metadata.yaml
index 0001b21..ed45d0c 100644
--- a/src/metadata.yaml
+++ b/src/metadata.yaml
@@ -9,7 +9,7 @@ tags:
 subordinate: true
 series:
 - focal
-- impish
+- jammy
 provides:
   neutron-plugin-api-subordinate:
     interface: neutron-plugin-api-subordinate
diff --git a/tox.ini b/tox.ini
index 2d60b8a..e22fe48 100644
--- a/tox.ini
+++ b/tox.ini
@@ -68,21 +68,11 @@ basepython = python3
 deps = -r{toxinidir}/test-requirements.txt
 commands = stestr run --slowest {posargs}
 
-[testenv:py35]
-basepython = python3.5
-deps = -r{toxinidir}/test-requirements.txt
-commands = stestr run --slowest {posargs}
-
 [testenv:py36]
 basepython = python3.6
 deps = -r{toxinidir}/test-requirements.txt
 commands = stestr run --slowest {posargs}
 
-[testenv:py37]
-basepython = python3.7
-deps = -r{toxinidir}/test-requirements.txt
-commands = stestr run --slowest {posargs}
-
 [testenv:py38]
 basepython = python3.8
 deps = -r{toxinidir}/test-requirements.txt
@@ -93,6 +83,11 @@ basepython = python3.9
 deps = -r{toxinidir}/test-requirements.txt
 commands = stestr run --slowest {posargs}
 
+[testenv:py310]
+basepython = python3.10
+deps = -r{toxinidir}/test-requirements.txt
+commands = stestr run --slowest {posargs}
+
 [testenv:pep8]
 basepython = python3
 deps = flake8==3.9.2