diff --git a/charms/jimm/charmcraft.yaml b/charms/jimm/charmcraft.yaml
index 69e9caa1f..aa59e3187 100644
--- a/charms/jimm/charmcraft.yaml
+++ b/charms/jimm/charmcraft.yaml
@@ -11,7 +11,7 @@ parts:
     charm-binary-python-packages:
       - Jinja2 >= 2.11.3
       - markupsafe >= 2.0.1
-      - pydantic
+      - pydantic == 1.10.*
       - cosl
 bases:
   # Ensure run-on is the same or newer than build-on
diff --git a/charms/jimm/lib/charms/grafana_agent/v0/cos_agent.py b/charms/jimm/lib/charms/grafana_agent/v0/cos_agent.py
index 0acaed361..9b73db82b 100644
--- a/charms/jimm/lib/charms/grafana_agent/v0/cos_agent.py
+++ b/charms/jimm/lib/charms/grafana_agent/v0/cos_agent.py
@@ -191,7 +191,7 @@ class _MetricsEndpointDict(TypedDict):
 LIBAPI = 0
 LIBPATCH = 3
 
-PYDEPS = ["cosl", "pydantic"]
+PYDEPS = ["cosl", "pydantic == 1.10.*"]
 
 DEFAULT_RELATION_NAME = "cos-agent"
 DEFAULT_PEER_RELATION_NAME = "peers"
diff --git a/charms/jimm/requirements.txt b/charms/jimm/requirements.txt
index 222ed3a3d..37cf25e8f 100644
--- a/charms/jimm/requirements.txt
+++ b/charms/jimm/requirements.txt
@@ -3,5 +3,5 @@ Jinja2 >= 2.11.3
 ops >= 2.0.0
 charmhelpers >= 0.20.22
 hvac >= 0.11.0
-pydantic
+pydantic == 1.10.*
 cosl