diff --git a/.github/workflows/tests-macos.yml b/.github/workflows/tests-macos.yml
index 0409b3ef2..421336fd0 100644
--- a/.github/workflows/tests-macos.yml
+++ b/.github/workflows/tests-macos.yml
@@ -26,6 +26,14 @@ jobs:
             env:
               TOXENV: no-reactor
 
+          # 3.15 pre-release
+          - python-version: "3.15.0-beta.2"
+            env:
+              TOXENV: py
+          - python-version: "3.15.0-beta.2"
+            env:
+              TOXENV: no-reactor
+
     steps:
     - uses: actions/checkout@v6
 
diff --git a/.github/workflows/tests-ubuntu.yml b/.github/workflows/tests-ubuntu.yml
index 15f25d9b8..95980a6ec 100644
--- a/.github/workflows/tests-ubuntu.yml
+++ b/.github/workflows/tests-ubuntu.yml
@@ -80,6 +80,17 @@ jobs:
           env:
             TOXENV: botocore
 
+        # 3.15 pre-release
+        - python-version: "3.15.0-beta.2"
+          env:
+            TOXENV: py
+        - python-version: "3.15.0-beta.2"
+          env:
+            TOXENV: default-reactor
+        - python-version: "3.15.0-beta.2"
+          env:
+            TOXENV: no-reactor
+
     steps:
     - uses: actions/checkout@v6
 
@@ -89,7 +100,7 @@ jobs:
         python-version: ${{ matrix.python-version }}
 
     - name: Install system libraries
-      if: contains(matrix.python-version, 'pypy') || contains(matrix.env.TOXENV, 'min')
+      if: contains(matrix.python-version, 'pypy') || contains(matrix.env.TOXENV, 'min') || contains(matrix.python-version, '3.15')
       run: |
         sudo apt-get update
         sudo apt-get install libxml2-dev libxslt-dev
diff --git a/.github/workflows/tests-windows.yml b/.github/workflows/tests-windows.yml
index f413782bc..a42dcae39 100644
--- a/.github/workflows/tests-windows.yml
+++ b/.github/workflows/tests-windows.yml
@@ -53,6 +53,17 @@ jobs:
           env:
             TOXENV: extra-deps
 
+        # 3.15 pre-release
+        - python-version: "3.15.0-beta.2"
+          env:
+            TOXENV: py
+        - python-version: "3.15.0-beta.2"
+          env:
+            TOXENV: default-reactor
+        - python-version: "3.15.0-beta.2"
+          env:
+            TOXENV: no-reactor
+
     steps:
     - uses: actions/checkout@v6
 
diff --git a/pyproject.toml b/pyproject.toml
index b24397c02..5dcce5988 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,6 +40,7 @@ classifiers = [
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
     "Programming Language :: Python :: 3.14",
+    "Programming Language :: Python :: 3.15",
     "Programming Language :: Python :: Implementation :: CPython",
     "Programming Language :: Python :: Implementation :: PyPy",
     "Topic :: Internet :: WWW/HTTP",
diff --git a/scrapy/utils/misc.py b/scrapy/utils/misc.py
index 20e7cb381..f23d88f4e 100644
--- a/scrapy/utils/misc.py
+++ b/scrapy/utils/misc.py
@@ -99,10 +99,10 @@ def walk_modules_iter(path: str) -> Iterable[ModuleType]:
     >>> list(walk_modules_iter('scrapy.utils'))
     [<module 'scrapy.utils' from '...'>, ...]
     >>> gen = walk_modules_iter('scrapy.utils.nonexistent') # error not raised until the generator is consumed
-    >>> list(gen)
+    >>> list(gen)  # doctest: +ELLIPSIS
     Traceback (most recent call last):
         ...
-    ModuleNotFoundError: No module named 'scrapy.utils.nonexistent'
+    ModuleNotFoundError: No module named 'scrapy.utils.nonexistent'...
     """
 
     mod = import_module(path)
diff --git a/tox.ini b/tox.ini
index 526533480..99343dd62 100644
--- a/tox.ini
+++ b/tox.ini
@@ -22,7 +22,7 @@ envlist =
     min-no-reactor
     min-botocore
     min-pypy3
-    py{310,311,312,313,314}
+    py{310,311,312,313,314,315}
     extra-deps
     default-reactor
     no-reactor