diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 432a414f5..0f2da06ec 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -2,6 +2,14 @@
 Changelog
 =========
 
+v0.54.0 (unreleased)
+--------------------
+Contributors to this version: Trevor James Smith (:user:`Zeitsperre`),
+
+Breaking changes
+----------------
+* The minimum required version of `dask` has been increased to `2024.8.1`. `dask` versions at or above `2024.11` are not yet supported. (:issue:`1992`, :pull:`1991`).
+
 v0.53.2 (2024-10-31)
 --------------------
 Contributors to this version: Éric Dupuis (:user:`coxipi`), Pascal Bourgault (:user:`aulemahal`), Trevor James Smith (:user:`Zeitsperre`).
diff --git a/environment.yml b/environment.yml
index a7d54a980..7a5f08ad9 100644
--- a/environment.yml
+++ b/environment.yml
@@ -9,7 +9,7 @@ dependencies:
   - cf_xarray >=0.9.3
   - cftime >=1.4.1
   - click >=8.1
-  - dask >=2.6.0
+  - dask >=2024.8.1,<2024.11.0
   - filelock >=3.14.0
   - jsonpickle >=3.1.0
   - numba >=0.54.1
diff --git a/pyproject.toml b/pyproject.toml
index 082108e7a..5ab0d9c3e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -39,7 +39,7 @@ dependencies = [
   "cf-xarray >=0.9.3", # cf-xarray is differently named on conda-forge
   "cftime >=1.4.1",
   "click >=8.1",
-  "dask[array] >=2.6",
+  "dask[array] >=2024.8.1,<2024.11.0",
   "filelock >=3.14.0",
   "jsonpickle >=3.1.0",
   "numba >=0.54.1",
@@ -128,7 +128,6 @@ xclim = "xclim.cli:cli"
 
 [tool.black]
 target-version = [
-  "py39",
   "py310",
   "py311",
   "py312"