diff --git a/.github/workflows/aa-ci.yml b/.github/workflows/aa-ci.yml
index 74e265a..cd9914c 100644
--- a/.github/workflows/aa-ci.yml
+++ b/.github/workflows/aa-ci.yml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
+        python-version: ['3.10', '3.11', '3.12', '3.13']
 
     steps:
       - uses: actions/checkout@main
diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index 6a2309f..cf8fa42 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -17,11 +17,11 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@main
         with:
-          python-version: '3.12'
+          python-version: '3.13'
       - name: Install coverage
         run: pip install coverage
       - name: Install astroalign dependencies
-        run: pip install "numpy>=1.11" "scipy>=0.15" scikit-image sep-pjw
+        run: pip install numpy scipy scikit-image "sep>=1.4.0"
       - name: Install test dependencies
         run: pip install -r tests/requirements.txt
       - name: Run coverage
diff --git a/astroalign.py b/astroalign.py
index b847460..dba6474 100644
--- a/astroalign.py
+++ b/astroalign.py
@@ -534,7 +534,7 @@ def register(
 
 def _find_sources(img, detection_sigma=5, min_area=5, mask=None):
     """Return sources (x, y) sorted by brightness."""
-    import sep_pjw as sep
+    import sep
 
     image = img.astype("float32")
     bkg = sep.Background(image, mask=mask)
diff --git a/pyproject.toml b/pyproject.toml
index 2dcb4d5..358d35b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,8 +9,8 @@ description = "Astrometric Alignment of Images"
 maintainers = [{ name = "Martin Beroiz", email = "martinberoiz@gmail.com" }]
 readme = "README.md"
 dynamic = ["version"]
-requires-python = ">=3.9"
-dependencies = ["numpy>=1.17", "scipy>=0.15", "scikit-image", "sep-pjw"]
+requires-python = ">=3.10"
+dependencies = ["numpy", "scipy", "scikit-image", "sep>=1.4.0"]
 license = { file = "LICENSE.txt" }
 keywords = [
     "astronomy",
diff --git a/tests/test_align.py b/tests/test_align.py
index 230e793..f4aa304 100644
--- a/tests/test_align.py
+++ b/tests/test_align.py
@@ -265,7 +265,7 @@ def compare_image(self, the_image):
         """Return the fraction of sources found in the reference image"""
         # pixel comparison is not good, doesn't work. Compare catalogs.
         full_algn = the_image.astype("float32")
-        import sep_pjw as sep
+        import sep
 
         bkg = sep.Background(full_algn)
         thresh = 5.0 * bkg.globalrms
@@ -724,7 +724,7 @@ def compare_image(self, the_image):
         """Return the fraction of sources found in the reference image"""
         # pixel comparison is not good, doesn't work. Compare catalogs.
         full_algn = np.mean(the_image, axis=-1, dtype="float32")
-        import sep_pjw as sep
+        import sep
 
         bkg = sep.Background(full_algn)
         thresh = 5.0 * bkg.globalrms
diff --git a/tox.ini b/tox.ini
index 4542329..1bd2b5e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,18 +4,18 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = py{38,39,310,311}, style, docs, docstyle
+envlist = py{310,311,312,313}, style, docs, docstyle
 
 
 [gh-actions]
 python =
-    3.8: py38
-    3.9: py39
     3.10: py310
-    3.11: style, docstyle, docs, py311
+    3.11: py311
+    3.12: py312
+    3.13: style, docstyle, docs, py313
 
 
-[testenv:py{38,39,310,311}]
+[testenv:py{310,311,312,313}]
 usedevelop = False
 deps =
     astropy