diff --git a/.github/workflows/ci_workflows.yml b/.github/workflows/ci_workflows.yml
index b7a51f4..38fdde3 100644
--- a/.github/workflows/ci_workflows.yml
+++ b/.github/workflows/ci_workflows.yml
@@ -70,29 +70,29 @@ jobs:
 
           - name: Test without optional deps
             os: ubuntu-latest
-            python: 3.9
-            toxenv: py39-test
+            python: '3.12'
+            toxenv: py312-test
 
           - name: Coverage test with remote data
             os: ubuntu-latest
-            python: '3.10'
-            toxenv: py310-test-alldeps-cov
+            python: '3.11'
+            toxenv: py311-test-alldeps-cov
             toxposargs: --remote-data
 
           - name: Test with dev dependencies
             os: ubuntu-latest
-            python: '3.12'
-            toxenv: py312-test-devdeps
+            python: '3.13'
+            toxenv: py313-test-devdeps
 
           - name: Test with old dependencies
-            os: ubuntu-20.04
-            python: 3.9
-            toxenv: py39-test-oldestdeps
+            os: ubuntu-latest
+            python: '3.10'
+            toxenv: py310-test-oldestdeps
 
           - name: Test in OSX
             os: macos-latest
-            python: '3.10'
-            toxenv: py310-test
+            python: '3.12'
+            toxenv: py312-test
 
           # NOTE: If TRDS cannot take the hit, disable --remote-data
           - name: Test in Windows with remote data
diff --git a/.github/workflows/open_actions.yml b/.github/workflows/open_actions.yml
deleted file mode 100644
index e1bc804..0000000
--- a/.github/workflows/open_actions.yml
+++ /dev/null
@@ -1,35 +0,0 @@
-name: When Opened
-
-on:
-  issues:
-    types:
-    - opened
-  pull_request_target:
-    types:
-    - opened
-
-jobs:
-  triage:
-    runs-on: ubuntu-latest
-    steps:
-    - name: Label PR
-      uses: actions/labeler@8558fd74291d67161a8a78ce36a881fa63b766a9  # v5.0.0
-      if: github.event_name == 'pull_request_target' || github.event_name == 'pull_request'
-      with:
-        repo-token: "${{ secrets.GITHUB_TOKEN }}"
-    - name: 'Comment Draft PR'
-      uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea  # v7.0.1
-      if: github.event.pull_request.draft == true
-      with:
-        github-token: ${{ secrets.GITHUB_TOKEN }}
-        script: |
-          await github.rest.issues.createComment({
-            issue_number: context.issue.number,
-            owner: context.repo.owner,
-            repo: context.repo.repo,
-            body: '👋 Thank you for your draft pull request! Do you know that you can use `[ci skip]` or `[skip ci]` in your commit messages to skip running continuous integration tests until you are ready?'
-          })
-    - name: Special comment
-      uses: pllim/action-special_pr_comment@5126c189c02418a55448480b28efd1a00af48d7b  # 0.2
-      with:
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/CHANGES.rst b/CHANGES.rst
index 7ddf399..f8080fa 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,9 @@
-1.3.1 (unreleased)
+1.4.0 (2024-11-19)
 ==================
 
+- Bumped minimum supported versions for Python to 3.10,
+  ``numpy`` to 1.23, ``astropy`` to 6.0, and ``scipy`` to 1.9. [#201]
+
 1.3.0 (2023-11-28)
 ==================
 
diff --git a/docs/index.rst b/docs/index.rst
index 75e35be..9f874f1 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -41,7 +41,7 @@ reported) or contact `STScI Help Desk <https://hsthelp.stsci.edu>`_.
 Installation and Setup
 ======================
 
-**stsynphot** works for Python 3.9 or later only. It requires the following
+**stsynphot** works for Python 3.10 or later only. It requires the following
 packages:
 
 * numpy
diff --git a/setup.cfg b/setup.cfg
index a3c3773..c8b0aad 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -16,9 +16,6 @@ filterwarnings =
     ignore:.*Column disp option
     ignore:BlackBody provides the same capabilities
     ignore:The MexicanHat1D class is deprecated
-    # Ignore numpy 2.0 warning, see https://github.com/astropy/astropy/pull/15495
-    # and https://github.com/scipy/scipy/pull/19275
-    ignore:.*numpy\.core.*:DeprecationWarning
 
 [metadata]
 name = stsynphot
@@ -48,12 +45,12 @@ zip_safe = False
 setup_requires =
     setuptools_scm
 install_requires =
-    numpy>=1.20
-    astropy>=5
-    scipy>=1.6
+    numpy>=1.23
+    astropy>=6
+    scipy>=1.9
     synphot>=1.1
     beautifulsoup4
-python_requires = >=3.9
+python_requires = >=3.10
 
 [options.extras_require]
 all =
diff --git a/tox.ini b/tox.ini
index dbe8805..ee130a2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 envlist =
-    py{39,310,311,312}-test{,-alldeps,-oldestdeps,-devdeps,-predeps}{,-cov}
+    py{310,311,312,313}-test{,-alldeps,-oldestdeps,-devdeps,-predeps}{,-cov}
     codestyle
     twine
     bandit
@@ -36,9 +36,9 @@ deps =
 
     # The oldestdeps factor is intended to be used to install the oldest versions of all
     # dependencies that have a minimum version.
-    oldestdeps: numpy==1.20.*
-    oldestdeps: scipy==1.6.*
-    oldestdeps: astropy==5.0.*
+    oldestdeps: numpy==1.23.*
+    oldestdeps: scipy==1.9.*
+    oldestdeps: astropy==6.0.*
     oldestdeps: attrs < 24.1.0  # ASDF_LT_3_4
     oldestdeps: asdf==2.14.*
     oldestdeps: synphot==1.1.*