diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 90c190c..9bbc66a 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -1,5 +1,5 @@
 
-name: Build Package and Test Source Code [Python 3.9, 3.10, 3.11, 3.12]
+name: Build Package and Test Source Code [Python 3.10, 3.11, 3.12]
 
 on:
   push:
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.9, "3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12"]
 
     steps:
       - name: Checkout
diff --git a/environment.yml b/environment.yml
index f5479a4..dacd492 100644
--- a/environment.yml
+++ b/environment.yml
@@ -2,8 +2,8 @@ name: paramtools-dev
 channels:
   - conda-forge
 dependencies:
-  - "marshmallow>=3.0.0"
-  - "numpy>=1.13"
+  - "marshmallow>=3.22.0"
+  - "numpy>=2.1.0"
   - "python-dateutil>=2.8.0"
   - "pytest>=6.0.0"
   - pandas
diff --git a/paramtools/__init__.py b/paramtools/__init__.py
index d8088f2..b5bec61 100644
--- a/paramtools/__init__.py
+++ b/paramtools/__init__.py
@@ -53,7 +53,7 @@
 
 
 name = "paramtools"
-__version__ = "0.18.2"
+__version__ = "0.18.3"
 
 __all__ = [
     "SchemaFactory",
diff --git a/paramtools/schema.py b/paramtools/schema.py
index 4ebe76d..ebbb453 100644
--- a/paramtools/schema.py
+++ b/paramtools/schema.py
@@ -204,7 +204,7 @@ def validate_only(self, data):
             error_store=error_store, data=data, many=None
         )
         # Run schema-level validation
-        if self._has_processors(decorators.VALIDATES_SCHEMA):
+        if self._hooks[decorators.VALIDATES_SCHEMA]:
             field_errors = bool(error_store.errors)
             self._invoke_schema_validators(
                 error_store=error_store,
diff --git a/setup.py b/setup.py
index 099ddaa..e6c1ced 100644
--- a/setup.py
+++ b/setup.py
@@ -6,7 +6,7 @@
 
 setuptools.setup(
     name="paramtools",
-    version=os.environ.get("VERSION", "0.18.2"),
+    version=os.environ.get("VERSION", "0.18.3"),
     author="Hank Doupe",
     author_email="henrymdoupe@gmail.com",
     description=(