diff --git a/changelog.md b/changelog.md
index c381f221..3bb0d675 100644
--- a/changelog.md
+++ b/changelog.md
@@ -13,6 +13,10 @@ Internal
 * Add Python 3.15 to CI.
 * Switch to Python 3.15 by default in CI.
 * Switch to Python 3.15 in Dockerfile.
+* Upgrade `mypy` to v2.4.0.
+* Upgrade `tox` to v4.64.9.
+* Upgrade `coverage` to v7.16.2.
+* Upgrade `pdbpp` to v0.12.1.
 
 
 v2.29.4 (2026/10/11)
diff --git a/pyproject.toml b/pyproject.toml
index 4046ed6d..45d071fb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -76,14 +76,14 @@ all = [
 ]
 dev = [
     "behave ~= 1.3.3",
-    "coverage ~= 7.15.4",
-    "mypy ~= 2.3.1",
+    "coverage ~= 7.16.2",
+    "mypy ~= 2.4.0",
     "pexpect ~= 4.9.0",
     "pytest ~= 9.1.1",
     "pytest-cov ~= 7.1.0",
     "pytest-random-order ~= 1.2.0",
-    "tox ~= 4.35.0",
-    "pdbpp ~= 0.11.7",
+    "tox ~= 4.64.9",
+    "pdbpp ~= 0.12.1",
     "ruff ~= 0.16.5",                       # keep in sync with the tool.tox.env.style stanza below
 ]