diff --git a/.github/workflows/test-upstream.yaml b/.github/workflows/test-upstream.yaml
index 3614f896..91a4f3ea 100644
--- a/.github/workflows/test-upstream.yaml
+++ b/.github/workflows/test-upstream.yaml
@@ -140,7 +140,7 @@ jobs:
       # the cache will still speedup the rest of the installation
       - name: install linkml
         working-directory: linkml
-        run: poetry sync --no-interaction --all-extras
+        run: poetry install --no-interaction --all-extras
 
       - name: print linkml-runtime version
         working-directory: linkml
diff --git a/poetry.lock b/poetry.lock
index 8474ace3..580292c8 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,4 +1,4 @@
-# This file is automatically @generated by Poetry 2.1.1 and should not be changed by hand.
+# This file is automatically @generated by Poetry 2.1.2 and should not be changed by hand.
 
 [[package]]
 name = "annotated-types"
@@ -315,7 +315,7 @@ description = "Like `typing._eval_type`, but lets older Python versions use newe
 optional = false
 python-versions = ">=3.8"
 groups = ["main"]
-markers = "python_version < \"3.10\""
+markers = "python_version == \"3.9\""
 files = [
     {file = "eval_type_backport-0.2.2-py3-none-any.whl", hash = "sha256:cb6ad7c393517f476f96d456d0412ea80f0a8cf96f6892834cd9340149111b0a"},
     {file = "eval_type_backport-0.2.2.tar.gz", hash = "sha256:f0576b4cf01ebb5bd358d02314d31846af5e07678387486e2c798af0e7d849c1"},
@@ -733,6 +733,7 @@ optional = false
 python-versions = "*"
 groups = ["main"]
 files = [
+    {file = "PyTrie-0.4.0-py3-none-any.whl", hash = "sha256:f687c224ee8c66cda8e8628a903011b692635ffbb08d4b39c5f92b18eb78c950"},
     {file = "PyTrie-0.4.0.tar.gz", hash = "sha256:8f4488f402d3465993fb6b6efa09866849ed8cda7903b50647b7d0342b805379"},
 ]
 
@@ -1230,4 +1231,4 @@ files = [
 [metadata]
 lock-version = "2.1"
 python-versions = "^3.9"
-content-hash = "a86079065945ae5cb39460f22b2a0d331f8145aeec49d25f05cb23b20ce0c468"
+content-hash = "b43f8e4857e598cbcf757ac2907efd854497add64ee7eac5aefc50be4d18d0b4"
diff --git a/pyproject.toml b/pyproject.toml
index d36d4d3e..d22220d7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -48,7 +48,7 @@ dependencies = [
     "requests",
     "prefixmaps >=0.1.4",
     "curies >=0.5.4",
-    "pydantic >=1.10.2, <3.0.0",
+    "pydantic >=2.0.0, <3.0.0",
     "isodate >=0.7.2, <1.0.0; python_version < '3.11'",
 ]