diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 1d12237a..beb481fe 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -33,6 +33,8 @@ jobs:
         - os: ubuntu-20.04
           python-version: '3.9'
           deps: minimal
+          pip-args: --constraint requirements/min_constraints.txt
+
       fail-fast: false
 
     concurrency:
@@ -48,12 +50,13 @@ jobs:
 
     - run: |
         python -m pip install --upgrade pip
-        python -m pip install -r requirements/dev.txt
+        python -m pip install -r requirements/dev.txt ${{ matrix.pip-args }}
 
     - if: matrix.deps == 'minimal'
       run: |
         pipx run uv pip compile pyproject.toml --resolution=lowest-direct > mindeps.txt
-        python -m pip install --requirement mindeps.txt
+        python -m pip install --requirement mindeps.txt \
+          --only-binary ':all:' ${{ matrix.pip-args }}
 
     - name: Build
       run: |
diff --git a/pyproject.toml b/pyproject.toml
index f4e4aa54..7d7c7688 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,7 +34,7 @@ requires-python = ">=3.9, <4"
 dependencies = [
     "colorspacious>=1.1.0",
     "matplotlib>=3.5",
-    "numpy>=1.22.4",
+    "numpy>=1.19.5",
 ]
 
 [project.urls]
diff --git a/requirements/min_constraints.txt b/requirements/min_constraints.txt
new file mode 100644
index 00000000..9f9659ac
--- /dev/null
+++ b/requirements/min_constraints.txt
@@ -0,0 +1 @@
+scipy<1.11