diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index df021db..0889b1f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,7 +11,7 @@ jobs:
     name: Linux Test
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Install dependencies
         run: |
           sudo apt-get update -qq
@@ -46,9 +46,9 @@ jobs:
 
   macos-test:
     name: macOS Test
-    runs-on: macos-14
+    runs-on: macos-15
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Install dependencies
         run: |
           brew install scons
@@ -58,9 +58,9 @@ jobs:
 
   windows-test:
     name: Windows Test
-    runs-on: windows-2022
+    runs-on: windows-2025
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Install dependencies
         run: |
           python -m pip install -qq scons
@@ -73,13 +73,13 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-24.04, macos-14, windows-2022]
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        os: [ubuntu-24.04, macos-15, windows-2025]
+        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
           cache: "pip"
@@ -110,11 +110,11 @@ jobs:
     name: Python Formatting
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Set up Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
-          python-version: "3.13"
+          python-version: "3.14"
           cache: "pip"
           cache-dependency-path: "requirements-black.txt"
       - name: Install dependencies
diff --git a/.trustinsoft/SConscript b/.trustinsoft/SConscript
index 4b1b87b..1cd355a 100644
--- a/.trustinsoft/SConscript
+++ b/.trustinsoft/SConscript
@@ -1,7 +1,7 @@
 Import("env")
 
 tis_env = env.Clone()
-tis_env.Append(CPPPATH="stubs")
+tis_env.Append(CPPPATH=Dir("stubs").srcnode())
 
 tis_env.Program("hash.c")
 tis_env.Program("x25519.c")
diff --git a/SConstruct b/SConstruct
index 952835c..3b3d74a 100644
--- a/SConstruct
+++ b/SConstruct
@@ -9,7 +9,7 @@ import SCons.Errors
 
 def build_with_env(path, env, tests=True, examples=False, measure_size=False):
     lith_env = env.Clone()
-    lith_env.Append(CPPPATH=[Dir("include")])
+    lith_env.Append(CPPPATH=[Dir("include").srcnode()])
     liblith_env = lith_env.Clone()
     liblith_env.Append(CFLAGS=["-ansi"])
     liblithium = SConscript(
@@ -33,7 +33,7 @@ def build_with_env(path, env, tests=True, examples=False, measure_size=False):
     lith_env.Append(CFLAGS=["-Wno-declaration-after-statement"])
 
     hydro_env = lith_env.Clone()
-    hydro_env.Append(CPPPATH=[Dir("hydro")])
+    hydro_env.Append(CPPPATH=[Dir("hydro").srcnode()])
     libhydrogen = SConscript(
         dirs="hydro",
         variant_dir=os.path.join(path, "hydro", "lib"),
@@ -44,7 +44,7 @@ def build_with_env(path, env, tests=True, examples=False, measure_size=False):
 
     if tests:
         test_env = lith_env.Clone()
-        test_env.Append(CPPPATH=Dir("src"))
+        test_env.Append(CPPPATH=Dir("src").srcnode())
         SConscript(
             dirs="test",
             variant_dir=os.path.join(path, "test"),
@@ -125,7 +125,7 @@ AddOption(
     dest="target",
     default="host",
     action="store",
-    help=f"choose targets ({', '.join(all_targets)}) or specify \"all\"",
+    help=f'choose targets ({", ".join(all_targets)}) or specify "all"',
     metavar="TARGET1[,TARGET2...]",
 )
 
diff --git a/requirements-black.txt b/requirements-black.txt
index ad2b44c..d653a60 100644
--- a/requirements-black.txt
+++ b/requirements-black.txt
@@ -1 +1 @@
-black==24.10.0
+black==25.11.0
diff --git a/setup.py b/setup.py
index ba9be5d..b7a88ee 100644
--- a/setup.py
+++ b/setup.py
@@ -20,11 +20,11 @@
         "Topic :: Software Development :: Embedded Systems",
         "Programming Language :: C",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
         "Programming Language :: Python :: 3.13",
+        "Programming Language :: Python :: 3.14",
         "License :: OSI Approved :: Apache Software License",
         "License :: OSI Approved :: MIT License",
     ],