diff --git a/.github/workflows/ci-integration.yml b/.github/workflows/ci-integration.yml
index 36e1d380..9e5bf6ab 100644
--- a/.github/workflows/ci-integration.yml
+++ b/.github/workflows/ci-integration.yml
@@ -29,6 +29,9 @@ jobs:
         python-version:
           - "3.9"
           - "3.10"
+        pydantic-version:
+          - "1.10.17"
+          - "2"
 
     steps:
       - uses: actions/checkout@v2
@@ -39,6 +42,10 @@ jobs:
           create-args: >-
             python=${{ matrix.python-version }}
 
+      - name: Optionally install Pydantic 1
+        if: ${{ matrix.pydantic-version == '1.10.17' }}
+        run: pip install "pydantic==1.10.17"
+
       - name: "Install"
         run: python -m pip install --no-deps -e .
 
@@ -49,7 +56,7 @@ jobs:
 
       - name: "Run tests"
         run: |
-          pytest -v --cov=alchemiscale --cov-report=xml alchemiscale/tests
+          pytest -v --cov=alchemiscale --cov-report=xml alchemiscale/tests --durations=20 -x
 
       - name: codecov
         if: ${{ github.repository == 'openforcefield/alchemiscale'
diff --git a/alchemiscale/compute/settings.py b/alchemiscale/compute/settings.py
index 87c80f97..4c4c7319 100644
--- a/alchemiscale/compute/settings.py
+++ b/alchemiscale/compute/settings.py
@@ -1,6 +1,6 @@
 from pathlib import Path
 from typing import Union, Optional, List, Dict, Tuple
-from pydantic import BaseModel, Field
+from pydantic.v1 import BaseModel, Field
 
 from ..models import Scope, ScopedKey
 
diff --git a/alchemiscale/models.py b/alchemiscale/models.py
index 75edd1d0..98480431 100644
--- a/alchemiscale/models.py
+++ b/alchemiscale/models.py
@@ -5,7 +5,7 @@
 """
 
 from typing import Optional, Union
-from pydantic import BaseModel, Field, validator, root_validator
+from pydantic.v1 import BaseModel, Field, validator, root_validator
 from gufe.tokenization import GufeKey
 from re import fullmatch
 
diff --git a/alchemiscale/security/auth.py b/alchemiscale/security/auth.py
index f4782ea1..5a30405a 100644
--- a/alchemiscale/security/auth.py
+++ b/alchemiscale/security/auth.py
@@ -12,7 +12,7 @@
 from fastapi.security import OAuth2PasswordBearer
 from jose import JWTError, jwt
 from passlib.context import CryptContext
-from pydantic import BaseModel
+from pydantic.v1 import BaseModel
 
 from .models import Token, TokenData, CredentialedEntity
 
diff --git a/alchemiscale/security/models.py b/alchemiscale/security/models.py
index 62f0395c..6935dae3 100644
--- a/alchemiscale/security/models.py
+++ b/alchemiscale/security/models.py
@@ -7,7 +7,7 @@
 from datetime import datetime, timedelta
 from typing import List, Union, Optional
 
-from pydantic import BaseModel, validator
+from pydantic.v1 import BaseModel, validator
 
 from ..models import Scope
 
diff --git a/alchemiscale/settings.py b/alchemiscale/settings.py
index 951d27d9..c6c724a9 100644
--- a/alchemiscale/settings.py
+++ b/alchemiscale/settings.py
@@ -7,7 +7,7 @@
 from functools import lru_cache
 from typing import Optional
 
-from pydantic import BaseSettings
+from pydantic.v1 import BaseSettings
 
 
 class FrozenSettings(BaseSettings):
diff --git a/alchemiscale/storage/models.py b/alchemiscale/storage/models.py
index c9b000b8..e0075e98 100644
--- a/alchemiscale/storage/models.py
+++ b/alchemiscale/storage/models.py
@@ -13,7 +13,7 @@
 import hashlib
 
 
-from pydantic import BaseModel, Field
+from pydantic.v1 import BaseModel, Field
 from gufe.tokenization import GufeTokenizable, GufeKey
 
 from ..models import ScopedKey, Scope
diff --git a/alchemiscale/tests/unit/test_base_api.py b/alchemiscale/tests/unit/test_base_api.py
index 6ba55ba6..38d162ce 100644
--- a/alchemiscale/tests/unit/test_base_api.py
+++ b/alchemiscale/tests/unit/test_base_api.py
@@ -1,7 +1,7 @@
 import pytest
 
 from fastapi import HTTPException
-from pydantic import ValidationError
+from pydantic.v1 import ValidationError
 
 from alchemiscale.base.api import validate_scopes, validate_scopes_query
 from alchemiscale.models import Scope, ScopedKey
diff --git a/alchemiscale/tests/unit/test_models.py b/alchemiscale/tests/unit/test_models.py
index c8285fbf..13e9f76d 100644
--- a/alchemiscale/tests/unit/test_models.py
+++ b/alchemiscale/tests/unit/test_models.py
@@ -1,6 +1,6 @@
 import pytest
 
-from pydantic import ValidationError
+from pydantic.v1 import ValidationError
 
 from alchemiscale.models import Scope
 
diff --git a/devtools/conda-envs/alchemiscale-client.yml b/devtools/conda-envs/alchemiscale-client.yml
index 6f583986..aaa54f22 100644
--- a/devtools/conda-envs/alchemiscale-client.yml
+++ b/devtools/conda-envs/alchemiscale-client.yml
@@ -15,7 +15,7 @@ dependencies:
   - requests
   - click
   - httpx
-  - pydantic<2.0
+  - pydantic>=1.10.17,<3.0
 
   ## user client printing
   - rich
diff --git a/devtools/conda-envs/alchemiscale-compute.yml b/devtools/conda-envs/alchemiscale-compute.yml
index c0f371d2..ec865baf 100644
--- a/devtools/conda-envs/alchemiscale-compute.yml
+++ b/devtools/conda-envs/alchemiscale-compute.yml
@@ -15,7 +15,7 @@ dependencies:
   - requests
   - click
   - httpx
-  - pydantic<2.0
+  - pydantic>=1.10.17,<3.0
 
   # perses dependencies
   - openeye-toolkits
diff --git a/devtools/conda-envs/alchemiscale-server.yml b/devtools/conda-envs/alchemiscale-server.yml
index f8909d40..6193b2b1 100644
--- a/devtools/conda-envs/alchemiscale-server.yml
+++ b/devtools/conda-envs/alchemiscale-server.yml
@@ -15,7 +15,7 @@ dependencies:
   - openmmforcefields>=0.12.0
   - requests
   - click
-  - pydantic<2.0
+  - pydantic>=1.10.17,<3.0
 
   ## state store
   - neo4j-python-driver
diff --git a/devtools/conda-envs/test.yml b/devtools/conda-envs/test.yml
index fdab69d7..d225cb54 100644
--- a/devtools/conda-envs/test.yml
+++ b/devtools/conda-envs/test.yml
@@ -10,7 +10,7 @@ dependencies:
   - gufe>=1.0.0
   - openfe>=1.0.1
   - openmmforcefields>=0.12.0
-  - pydantic<2.0
+  - pydantic=2
 
   ## state store
   - neo4j-python-driver