diff --git a/.github/workflows/python-wheels-publish-test.yml b/.github/workflows/python-wheels-publish-test.yml
index c01fff87b..fd4556446 100644
--- a/.github/workflows/python-wheels-publish-test.yml
+++ b/.github/workflows/python-wheels-publish-test.yml
@@ -62,10 +62,6 @@ jobs:
           CIBW_SKIP: "*-win32 *_i686"
           CIBW_TEST_SKIP: "*-macosx_universal2:arm64"
           CIBW_ENVIRONMENT: OPENEXR_RELEASE_CANDIDATE_TAG="${{ github.ref_name }}"
-          CIBW_BEFORE_BUILD: |
-            pip install tomli
-            python -c "import tomli; print('\n'.join(tomli.load(open('pyproject.toml', 'rb'))['build-system']['requires']))" > build_requirements.txt &&
-            pip install -r build_requirements.txt
 
       - name: Upload artifact
         uses: actions/upload-artifact@b4b15b8c7c6ac21ea08fcf65892d2ee8f75cf882 # v4.4.3
diff --git a/.github/workflows/python-wheels-publish.yml b/.github/workflows/python-wheels-publish.yml
index 5a2b9bcc1..2cfc1fdb9 100644
--- a/.github/workflows/python-wheels-publish.yml
+++ b/.github/workflows/python-wheels-publish.yml
@@ -55,10 +55,6 @@ jobs:
           CIBW_BUILD: "cp37-* cp38-* cp39-* cp310-* cp311-* cp312-*"
           CIBW_SKIP: "*-win32 *_i686"
           CIBW_TEST_SKIP: "*arm64"
-          CIBW_BEFORE_BUILD: |
-            pip install tomli
-            python -c "import tomli; print('\n'.join(tomli.load(open('pyproject.toml', 'rb'))['build-system']['requires']))" > build_requirements.txt &&
-            pip install -r build_requirements.txt
 
       - name: Upload artifact
         uses: actions/upload-artifact@b4b15b8c7c6ac21ea08fcf65892d2ee8f75cf882 # v4.4.3
diff --git a/.github/workflows/python-wheels.yml b/.github/workflows/python-wheels.yml
index 751aaf9b6..6bc0c5fc6 100644
--- a/.github/workflows/python-wheels.yml
+++ b/.github/workflows/python-wheels.yml
@@ -68,10 +68,6 @@ jobs:
           CIBW_SKIP: "*-win32 *_i686"
           CIBW_TEST_SKIP: "*-macosx*arm64"
           OPENEXR_TEST_IMAGE_REPO: "https://raw.githubusercontent.com/AcademySoftwareFoundation/openexr-images/main"
-          CIBW_BEFORE_BUILD: |
-            pip install tomli
-            python -c "import tomli; print('\n'.join(tomli.load(open('pyproject.toml', 'rb'))['build-system']['requires']))" > build_requirements.txt &&
-            pip install -r build_requirements.txt
 
       - name: Upload artifact
         uses: actions/upload-artifact@b4b15b8c7c6ac21ea08fcf65892d2ee8f75cf882 # v4.4.3
diff --git a/pyproject.toml b/pyproject.toml
index 7e011227a..94f475970 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,7 +2,7 @@
 # Copyright (c) Contributors to the OpenEXR Project.
 
 [build-system]
-requires = ["scikit-build-core==0.10.7", "pybind11", "numpy"]
+requires = ["scikit-build-core==0.10.7", "pybind11"]
 build-backend = "scikit_build_core.build"
 
 [project]
@@ -17,7 +17,7 @@ authors = [
 requires-python = ">=3.7"
 
 dependencies = [
-  "numpy>=1.18"
+  "numpy>=1.7.0"
 ]
 
 [project.urls]