diff --git a/.github/workflows/benchmark.yml b/.github/workflows/benchmark.yml
index ef63aed..face743 100644
--- a/.github/workflows/benchmark.yml
+++ b/.github/workflows/benchmark.yml
@@ -12,12 +12,12 @@ jobs:
   benchmarks:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
         with:
           persist-credentials: false
 
       - name: Set up Python 3.14
-        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+        uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
         with:
           python-version: "3.14"
           allow-prereleases: true
@@ -34,7 +34,7 @@ jobs:
         run: pip install -e ".[tests]"
 
       - name: Run benchmarks
-        uses: CodSpeedHQ/action@3194d9a39c4d46684cb44bf7207fc56626aad8fd # v4.15.1
+        uses: CodSpeedHQ/action@a4a36bb07c0638b0b4ca52bf1f3dad1b4289e52f # v4.18.1
         with:
           mode: simulation
           run: pytest tests/test_benchmarks.py --codspeed
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 4291693..60b86e1 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -12,17 +12,17 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
         with:
           persist-credentials: false
 
       - name: Set up Python
-        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+        uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
         with:
           python-version: "3.x"
 
       - name: Install uv
-        uses: astral-sh/setup-uv@08807647e7069bb48b6ef5acd8ec9567f424441b # v8.1.0
+        uses: astral-sh/setup-uv@fac544c07dec837d0ccb6301d7b5580bf5edae39 # v8.2.0
 
       - name: Docs
         run: |
diff --git a/.github/workflows/labels.yml b/.github/workflows/labels.yml
index 85b60da..f81156d 100644
--- a/.github/workflows/labels.yml
+++ b/.github/workflows/labels.yml
@@ -12,9 +12,9 @@ jobs:
   sync:
     permissions:
       pull-requests: write
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     steps:
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
         with:
           persist-credentials: false
       - uses: micnncim/action-label-syncer@3abd5ab72fda571e69fffd97bd4e0033dd5f495c # v1.3.0
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 1041c72..36aed10 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
         with:
           persist-credentials: false
       - uses: j178/prek-action@bdca6f102f98e2b4c7029491a53dfd366469e33d # v2.0.4
@@ -22,13 +22,13 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
         with:
           persist-credentials: false
-      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+      - uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
         with:
           python-version: "3.x"
       - name: Install uv
-        uses: astral-sh/setup-uv@08807647e7069bb48b6ef5acd8ec9567f424441b # v8.1.0
+        uses: astral-sh/setup-uv@fac544c07dec837d0ccb6301d7b5580bf5edae39 # v8.2.0
       - name: Mypy
         run: uvx --with tox-uv tox -e mypy
diff --git a/.github/workflows/release-drafter.yml b/.github/workflows/release-drafter.yml
index 7e539aa..4929270 100644
--- a/.github/workflows/release-drafter.yml
+++ b/.github/workflows/release-drafter.yml
@@ -25,7 +25,7 @@ jobs:
     runs-on: ubuntu-slim
     steps:
       # Drafts your next release notes as pull requests are merged into "main"
-      - uses: release-drafter/release-drafter@693d20e7c1ce1a81d3a41962f85914253b518449 # v7.3.1
+      - uses: release-drafter/release-drafter@ed4bc48ec97379be2258e7b7ac2624a3e26ab809 # v7.4.0
 
   autolabeler:
     if: |
@@ -36,4 +36,4 @@ jobs:
       pull-requests: write
     runs-on: ubuntu-slim
     steps:
-      - uses: release-drafter/release-drafter/autolabeler@693d20e7c1ce1a81d3a41962f85914253b518449 # v7.3.1
+      - uses: release-drafter/release-drafter/autolabeler@ed4bc48ec97379be2258e7b7ac2624a3e26ab809 # v7.4.0
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 4595ff9..4d7a4e5 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -23,7 +23,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
         with:
           fetch-depth: 0
           persist-credentials: false
diff --git a/.github/workflows/require-pr-label.yml b/.github/workflows/require-pr-label.yml
index bd53a2a..47bf92b 100644
--- a/.github/workflows/require-pr-label.yml
+++ b/.github/workflows/require-pr-label.yml
@@ -6,7 +6,7 @@ on:
 
 jobs:
   label:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
 
     permissions:
       issues: write
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index ef093e7..6cb6e61 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -20,7 +20,6 @@ jobs:
           - "3.15"
           - "3.14t"
           - "3.14"
-          - "3.13t"
           - "3.13"
           - "3.12"
           - "3.11"
@@ -28,12 +27,12 @@ jobs:
         os: [windows-latest, macos-latest, ubuntu-latest]
 
     steps:
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
         with:
           persist-credentials: false
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+        uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
         with:
           python-version: ${{ matrix.python-version }}
           allow-prereleases: true
@@ -54,7 +53,7 @@ jobs:
           brew install gettext
 
       - name: Install uv
-        uses: astral-sh/setup-uv@08807647e7069bb48b6ef5acd8ec9567f424441b # v8.1.0
+        uses: astral-sh/setup-uv@fac544c07dec837d0ccb6301d7b5580bf5edae39 # v8.2.0
 
       - name: Generate translation binaries
         run: |
@@ -65,7 +64,7 @@ jobs:
           uvx --python ${{ matrix.python-version }} --with tox-uv tox -e py
 
       - name: Upload coverage
-        uses: codecov/codecov-action@e79a6962e0d4c0c17b229090214935d2e33f8354 # v6.0.1
+        uses: codecov/codecov-action@fb8b3582c8e4def4969c97caa2f19720cb33a72f # v7.0.0
         with:
           flags: ${{ matrix.os }}
           name: ${{ matrix.os }} Python ${{ matrix.python-version }}
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index d6c446d..77b243c 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,12 +1,12 @@
 repos:
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.15.9
+    rev: v0.15.20
     hooks:
       - id: ruff-check
         args: [--exit-non-zero-on-fix]
 
   - repo: https://github.com/psf/black-pre-commit-mirror
-    rev: 26.3.1
+    rev: 26.5.1
     hooks:
       - id: black
 
@@ -27,7 +27,7 @@ repos:
         exclude: \.github/ISSUE_TEMPLATE\.md|\.github/PULL_REQUEST_TEMPLATE\.md
 
   - repo: https://github.com/python-jsonschema/check-jsonschema
-    rev: 0.37.1
+    rev: 0.37.4
     hooks:
       - id: check-github-workflows
       - id: check-renovate
@@ -38,12 +38,12 @@ repos:
       - id: actionlint
 
   - repo: https://github.com/zizmorcore/zizmor-pre-commit
-    rev: v1.23.1
+    rev: v1.26.1
     hooks:
       - id: zizmor
 
   - repo: https://github.com/tox-dev/pyproject-fmt
-    rev: v2.21.0
+    rev: v2.25.1
     hooks:
       - id: pyproject-fmt
 
@@ -63,7 +63,7 @@ repos:
       - id: yamlfmt
 
   - repo: https://github.com/rbubley/mirrors-prettier
-    rev: v3.8.1
+    rev: v3.9.4
     hooks:
       - id: prettier
         args: [--prose-wrap=always, --print-width=88]
diff --git a/docs/requirements.txt b/docs/requirements.txt
index 5c66848..c8e211c 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -3,4 +3,4 @@ mkdocs-include-markdown-plugin
 mkdocs-material
 mkdocstrings[python]==1.0.4
 pygments
-pymdown-extensions==10.21.3
+pymdown-extensions==11.0
diff --git a/pyproject.toml b/pyproject.toml
index b277739..1843da1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -100,15 +100,15 @@ lint.future-annotations = true
 max_supported_python = "3.15"
 
 [tool.mypy]
-pretty = true
 strict = true
+pretty = true
 show_error_codes = true
 
 [tool.pytest]
-minversion = "9.0"
 addopts = [ "--color=yes" ]
-testpaths = [ "tests" ]
 filterwarnings = [ "error" ]
+minversion = "9.0"
+testpaths = [ "tests" ]
 
 [tool.coverage]
 # Regexes for lines to exclude from consideration
diff --git a/src/humanize/__init__.py b/src/humanize/__init__.py
index 6fb9959..4f54bc4 100644
--- a/src/humanize/__init__.py
+++ b/src/humanize/__init__.py
@@ -2,6 +2,15 @@
 
 from __future__ import annotations
 
+__lazy_modules__ = {
+    "humanize._version",
+    "humanize.filesize",
+    "humanize.i18n",
+    "humanize.lists",
+    "humanize.number",
+    "humanize.time",
+}
+
 from humanize.filesize import naturalsize
 from humanize.i18n import activate, deactivate, decimal_separator, thousands_separator
 from humanize.lists import natural_list
diff --git a/src/humanize/filesize.py b/src/humanize/filesize.py
index c495fed..fb675fd 100644
--- a/src/humanize/filesize.py
+++ b/src/humanize/filesize.py
@@ -2,6 +2,8 @@
 
 from __future__ import annotations
 
+__lazy_modules__ = {"humanize.i18n", "math"}
+
 from math import log
 
 from humanize.i18n import _gettext as _
@@ -97,6 +99,12 @@ def naturalsize(
         return f"{int(bytes_)}B" if gnu else _("%d Bytes") % int(bytes_)
 
     exp = int(min(log(abs_bytes, base), len(suffix)))
+    # The suffix is chosen from the unrounded byte count, but `format` rounds the
+    # mantissa afterward; rounding can push it up to `base` (e.g. 999999 is
+    # 999.999 kB, which formats to "1000.0 kB"). When that happens and a larger
+    # suffix is available, step up one suffix so the result reads "1.0 MB".
+    if exp < len(suffix) and abs(float(format % (abs_bytes / (base**exp)))) >= base:
+        exp += 1
     space = "" if gnu else " "
     ret: str = format % (bytes_ / (base**exp)) + space + _(suffix[exp - 1])
     return ret
diff --git a/src/humanize/number.py b/src/humanize/number.py
index f4dcb05..2fb22c6 100644
--- a/src/humanize/number.py
+++ b/src/humanize/number.py
@@ -2,6 +2,8 @@
 
 from __future__ import annotations
 
+__lazy_modules__ = {"bisect"}
+
 import bisect
 
 from .i18n import _gettext as _
@@ -367,7 +369,12 @@ def fractional(value: NumberOrString) -> str:
     if not whole_number:
         return f"{numerator:.0f}/{denominator:.0f}"
 
-    return f"{whole_number:.0f} {numerator:.0f}/{denominator:.0f}"
+    # int() truncates toward zero, so for a negative number both
+    # whole_number and numerator carry the minus sign, which prints as
+    # "-1 -3/10". The sign already rides on the whole part; absorb it
+    # from the fractional part so the result reads as a normal mixed
+    # fraction.
+    return f"{whole_number:.0f} {abs(numerator):.0f}/{denominator:.0f}"
 
 
 def scientific(value: NumberOrString, precision: int = 2) -> str:
@@ -538,14 +545,22 @@ def metric(value: float, unit: str = "", precision: int = 3) -> str:
     if exponent >= 33 or exponent < -30:
         return scientific(value, precision - 1) + unit
 
-    value /= 10 ** (exponent // 3 * 3)
+    old_bucket = exponent // 3 * 3
+    value /= 10**old_bucket
+    digits = int(max(0, precision - exponent % 3 - 1))
+    if exponent < 30 and round(abs(value), digits) >= 1000:
+        exponent += 3 - exponent % 3
+        new_bucket = exponent // 3 * 3
+        value /= 10 ** (new_bucket - old_bucket)
+        digits = int(max(0, precision - exponent % 3 - 1))
+
     if exponent >= 3:
         ordinal_ = "kMGTPEZYRQ"[exponent // 3 - 1]
     elif exponent < 0:
         ordinal_ = "mμnpfazyrq"[(-exponent - 1) // 3]
     else:
         ordinal_ = ""
-    value_ = format(value, f".{int(max(0, precision - exponent % 3 - 1))}f")
+    value_ = format(value, f".{digits}f")
     if not (unit or ordinal_) or unit in ("°", "′", "″"):
         space = ""
     else:
diff --git a/src/humanize/time.py b/src/humanize/time.py
index 8651a98..4a07d52 100644
--- a/src/humanize/time.py
+++ b/src/humanize/time.py
@@ -5,6 +5,8 @@
 
 from __future__ import annotations
 
+__lazy_modules__ = {"humanize.i18n", "humanize.number"}
+
 from enum import Enum
 from functools import total_ordering
 
diff --git a/tests/test_filesize.py b/tests/test_filesize.py
index 04774d9..e695639 100644
--- a/tests/test_filesize.py
+++ b/tests/test_filesize.py
@@ -82,6 +82,15 @@
         ([1.123456789, False, True], "1B"),
         ([1.123456789 * 10**3, False, True], "1.1K"),
         ([1.123456789 * 10**6, False, True], "1.1M"),
+        # Rounding must not leave the mantissa at the base while a larger suffix
+        # is available: 999999 is 999.999 kB, which the "%.1f" format rounds to
+        # 1000.0 and must carry into 1.0 MB rather than render as "1000.0 kB".
+        ([999999], "1.0 MB"),
+        ([999999999], "1.0 GB"),
+        ([999999999999], "1.0 TB"),
+        ([1024**2 - 1, True], "1.0 MiB"),
+        ([1024**3 - 1, True], "1.0 GiB"),
+        ([1024**2 - 1, False, True], "1.0M"),
     ],
 )
 def test_naturalsize(test_args: list[int] | list[int | bool], expected: str) -> None:
diff --git a/tests/test_number.py b/tests/test_number.py
index cb74fcf..78639c3 100644
--- a/tests/test_number.py
+++ b/tests/test_number.py
@@ -122,6 +122,7 @@ def test_intword_powers() -> None:
         ([2e100], "2.0 googol"),
         ([None], "None"),
         (["1230000", "%0.2f"], "1.23 million"),
+        ([10**100], "1.0 googol"),
         ([10**101], "10.0 googol"),
         ([math.nan], "NaN"),
         ([math.inf], "+Inf"),
@@ -183,6 +184,9 @@ def test_apnumber(test_input: int | str, expected: str) -> None:
         (-math.inf, "-Inf"),
         ("nan", "NaN"),
         ("-inf", "-Inf"),
+        (-1.3, "-1 3/10"),
+        (-2.5, "-2 1/2"),
+        (-0.5, "-1/2"),
     ],
 )
 def test_fractional(test_input: float | str, expected: str) -> None:
@@ -254,6 +258,10 @@ def test_clamp(test_args: list[typing.Any], expected: str) -> None:
         ([1234.56], "1.23 k"),
         ([12345, "", 6], "12.3450 k"),
         ([200_000], "200 k"),
+        ([999.9, "V"], "1.00 kV"),
+        ([999.99, "V"], "1.00 kV"),
+        ([999_999, "V"], "1.00 MV"),
+        ([0.0009999, "V"], "1.00 mV"),
         ([1e25, "m"], "10.0 Ym"),
         ([1e26, "m"], "100 Ym"),
         ([1e27, "A"], "1.00 RA"),
diff --git a/tox.ini b/tox.ini
index 58cbf67..1e50273 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,11 +1,13 @@
 [tox]
 requires =
-    tox>=4.2
+    tox>=4.32
 env_list =
     docs
     lint
     mypy
-    py{py3, 315, 314, 313, 312, 311, 310}
+    py{py3}
+    py{310-315}
+    py{314-315}t
 
 [testenv]
 extras =