diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 38411afcc..1e2ae4b6a 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -3,11 +3,16 @@ updates:
   - package-ecosystem: "pip"
     directory: "/"
     target-branch: "development"
+    # Security advisories fire independently of the weekly schedule as long
+    # as the repo has "Dependabot security updates" enabled under
+    # Settings -> Code security. Weekly = non-security updates.
     schedule:
       interval: "weekly"
+    open-pull-requests-limit: 10
 
   - package-ecosystem: "github-actions"
     directory: "/"
     target-branch: "development"
     schedule:
       interval: "weekly"
+    open-pull-requests-limit: 10
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 943436b27..45228027c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,13 @@
 
 ## Unreleased
 
+* Bumped the urllib3 floor to 2.6.3 to pick up the fix for CVE-2026-21441
+  (GHSA-38jv-5279-wg99, 8.9 High): urllib3's streaming decompression
+  safeguards were bypassed when HTTP redirects were followed. TSC's manual
+  redirect walker (#1848) disables urllib3's built-in follower on new code
+  paths, but downstream callers using urllib3 directly (and TSC endpoints
+  that predate #1848) still relied on the built-in path, so the floor bump
+  closes the gap for all callers. The existing `<3` upper bound is unchanged.
 * Added `Projects.get_by_path(path)` to look up a project by its slash-separated
   hierarchy path (e.g. `"Marketing/Q1 Reports"`). The walk is performed level by
   level using the REST API name filter, so a path with *n* components issues *n*
diff --git a/pyproject.toml b/pyproject.toml
index e5a330c39..25e02e7a6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,7 +16,7 @@ dependencies = [
     'defusedxml>=0.7.1',  # latest as at 7/31/23
     'packaging>=23.1',   # latest as at 7/31/23
     'requests>=2.32',  # latest as at 7/31/23
-    'urllib3>=2.6.0,<3',
+    'urllib3>=2.6.3,<3',
     'typing_extensions>=4.0',
 ]
 requires-python = ">=3.10"