diff --git a/.ci/install.sh b/.ci/install.sh
index 52b821417..aeb5e6514 100755
--- a/.ci/install.sh
+++ b/.ci/install.sh
@@ -27,14 +27,13 @@ python3 -m pip install --upgrade wheel
 python3 -m pip install coverage
 python3 -m pip install defusedxml
 python3 -m pip install ipython
-python3 -m pip install numpy
 python3 -m pip install olefile
 python3 -m pip install -U pytest
 python3 -m pip install -U pytest-cov
 python3 -m pip install -U pytest-timeout
 python3 -m pip install pyroma
-# optional test dependency, only install if there's a binary package.
-# fails on beta 3.14 and PyPy
+# optional test dependencies, only install if there's a binary package.
+python3 -m pip install --only-binary=:all: numpy || true
 python3 -m pip install --only-binary=:all: pyarrow || true
 
 # PyQt6 doesn't support PyPy3
diff --git a/.github/workflows/macos-install.sh b/.github/workflows/macos-install.sh
index b114d4a23..7c768af48 100755
--- a/.github/workflows/macos-install.sh
+++ b/.github/workflows/macos-install.sh
@@ -26,9 +26,8 @@ python3 -m pip install -U pytest
 python3 -m pip install -U pytest-cov
 python3 -m pip install -U pytest-timeout
 python3 -m pip install pyroma
-python3 -m pip install numpy
-# optional test dependency, only install if there's a binary package.
-# fails on beta 3.14 and PyPy
+# optional test dependencies, only install if there's a binary package.
+python3 -m pip install --only-binary=:all: numpy || true
 python3 -m pip install --only-binary=:all: pyarrow || true
 
 # libavif
diff --git a/.github/workflows/test-windows.yml b/.github/workflows/test-windows.yml
index c4d0fa046..3450de355 100644
--- a/.github/workflows/test-windows.yml
+++ b/.github/workflows/test-windows.yml
@@ -35,7 +35,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["pypy3.11", "3.11", "3.12", "3.13", "3.14"]
+        python-version: ["pypy3.11", "3.11", "3.12", "3.13", "3.14", "3.15"]
         architecture: ["x64"]
         include:
             # Test the oldest Python on 32-bit
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 167faa239..da3eea066 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -42,6 +42,8 @@ jobs:
         ]
         python-version: [
           "pypy3.11",
+          "3.15t",
+          "3.15",
           "3.14t",
           "3.14",
           "3.13t",
@@ -54,6 +56,7 @@ jobs:
         - { python-version: "3.12", PYTHONOPTIMIZE: 1, REVERSE: "--reverse" }
         - { python-version: "3.11", PYTHONOPTIMIZE: 2 }
         # Free-threaded
+        - { python-version: "3.15t", disable-gil: true }
         - { python-version: "3.14t", disable-gil: true }
         - { python-version: "3.13t", disable-gil: true }
         # Intel
diff --git a/tox.ini b/tox.ini
index d58fd67b6..7f116c6e7 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,7 +3,7 @@ requires =
     tox>=4.2
 env_list =
     lint
-    py{py3, 314, 313, 312, 311, 310}
+    py{py3, 315, 314, 313, 312, 311, 310}
 
 [testenv]
 deps =