diff --git a/conda_lock/conda_lock.py b/conda_lock/conda_lock.py
index e7b0689d3..d8bd1350e 100644
--- a/conda_lock/conda_lock.py
+++ b/conda_lock/conda_lock.py
@@ -523,7 +523,9 @@ def do_render(
                     "dev-dependencies": str(include_dev_dependencies).lower(),
                     "input-hash": lockfile.metadata.content_hash,
                     "version": distribution("conda_lock").version,
-                    "timestamp": datetime.datetime.utcnow().strftime("%Y%m%dT%H%M%SZ"),
+                    "timestamp": datetime.datetime.now(datetime.timezone.utc).strftime(
+                        "%Y%m%dT%H%M%SZ"
+                    ),
                 }
 
                 filename = filename_template.format(**context)
diff --git a/conda_lock/lockfile/v1/models.py b/conda_lock/lockfile/v1/models.py
index 05706f171..919ea5944 100644
--- a/conda_lock/lockfile/v1/models.py
+++ b/conda_lock/lockfile/v1/models.py
@@ -89,7 +89,9 @@ class TimeMeta(StrictModel):
     @classmethod
     def create(cls) -> "TimeMeta":
         return cls(
-            created_at=datetime.datetime.utcnow().isoformat(timespec="seconds") + "Z"
+            created_at=datetime.datetime.now(datetime.timezone.utc).strftime(
+                "%Y-%m-%dT%H:%M:%SZ"
+            )
         )