diff --git a/CHANGELOG.md b/CHANGELOG.md
index 865ae8ab..e4991162 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [3.11.0] - 2026-08-29
+
 ### Added
 - **`DMLDiD` survey-design and cluster support (both lanes)**: `fit()` gains
   `survey_design=` (pweight-only full-design TSL — weights/strata/PSU/FPC)
@@ -5467,6 +5469,7 @@ for the full feature history leading to this release.
 [2.1.2]: https://github.com/igerber/diff-diff/compare/v2.1.1...v2.1.2
 [2.1.1]: https://github.com/igerber/diff-diff/compare/v2.1.0...v2.1.1
 [2.1.0]: https://github.com/igerber/diff-diff/compare/v2.0.3...v2.1.0
+[3.11.0]: https://github.com/igerber/diff-diff/compare/v3.10.0...v3.11.0
 [3.10.0]: https://github.com/igerber/diff-diff/compare/v3.9.1...v3.10.0
 [3.9.1]: https://github.com/igerber/diff-diff/compare/v3.9.0...v3.9.1
 [3.9.0]: https://github.com/igerber/diff-diff/compare/v3.8.0...v3.9.0
diff --git a/CITATION.cff b/CITATION.cff
index 053b51f7..63d21143 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -7,8 +7,8 @@ authors:
     family-names: Gerber
     orcid: "https://orcid.org/0009-0009-3275-5591"
 license: MIT
-version: "3.10.0"
-date-released: "2026-08-22"
+version: "3.11.0"
+date-released: "2026-08-29"
 doi: "10.5281/zenodo.19646175"
 url: "https://github.com/igerber/diff-diff"
 repository-code: "https://github.com/igerber/diff-diff"
diff --git a/diff_diff/__init__.py b/diff_diff/__init__.py
index 99c0d11b..e607af7d 100644
--- a/diff_diff/__init__.py
+++ b/diff_diff/__init__.py
@@ -371,7 +371,7 @@ def __getattr__(name: str) -> _Any:
     raise AttributeError(f"module 'diff_diff' has no attribute {name!r}")
 
 
-__version__ = "3.10.0"
+__version__ = "3.11.0"
 __all__ = [
     # Estimators
     "DifferenceInDifferences",
diff --git a/diff_diff/guides/llms-full.txt b/diff_diff/guides/llms-full.txt
index 88a14d78..83d401d7 100644
--- a/diff_diff/guides/llms-full.txt
+++ b/diff_diff/guides/llms-full.txt
@@ -2,7 +2,7 @@
 
 > A Python library for Difference-in-Differences causal inference analysis. Provides sklearn-like estimators with statsmodels-style output for econometric analysis.
 
-- Version: 3.10.0
+- Version: 3.11.0
 - Repository: https://github.com/igerber/diff-diff
 - License: MIT
 - Dependencies: numpy, pandas, scipy (no statsmodels dependency)
diff --git a/pyproject.toml b/pyproject.toml
index d1cc7c7c..328c2f6e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "maturin"
 
 [project]
 name = "diff-diff"
-version = "3.10.0"
+version = "3.11.0"
 description = "Difference-in-Differences causal inference with sklearn-like API. Callaway-Sant'Anna, Synthetic DiD, Honest DiD, event studies, parallel trends."
 readme = "README.md"
 license = "MIT"
diff --git a/rust/Cargo.toml b/rust/Cargo.toml
index 5ab7cbae..64a80e20 100644
--- a/rust/Cargo.toml
+++ b/rust/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "diff_diff_rust"
-version = "3.10.0"
+version = "3.11.0"
 edition = "2021"
 rust-version = "1.85"
 description = "Rust backend for diff-diff DiD library"
diff --git a/tests/test_naming_guard.py b/tests/test_naming_guard.py
index 881a3779..5e9ed0d2 100644
--- a/tests/test_naming_guard.py
+++ b/tests/test_naming_guard.py
@@ -107,7 +107,7 @@
 # silently disarm 4.0-window checks). Keyed off diff_diff.__version__ so the
 # Duty C lifecycle gate re-arms mechanically at each version bump; a missing
 # key fails loudly.
-_NEXT_RELEASE = {(3, 8): "3.9", (3, 9): "4.0", (3, 10): "4.0", (4, 0): "4.1"}
+_NEXT_RELEASE = {(3, 8): "3.9", (3, 9): "4.0", (3, 10): "4.0", (3, 11): "4.0", (4, 0): "4.1"}
 
 # Section-8 vocabulary predicate (Duty A). Every param/field rename token in
 # the ledger - current and lifecycle-gated - must be matched here