diff --git a/CHANGELOG.md b/CHANGELOG.md
index cdf0e6a..903ddb2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## 11.0.0 (unreleased)
 
+Fixes:
+
+- Prevent `DeprecationWarning` getting raised by marshmallow 3.21.0 (:issue:`333`).
+
 Other changes:
 
 - Remove `subcast_key` argument of `env.dict`. Use `subcast_keys` instead.
diff --git a/pyproject.toml b/pyproject.toml
index adb530e..b48cef0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "environs"
-version = "1.1.0"
+version = "11.0.0"
 description = "simplified environment variable parsing"
 readme = "README.md"
 license = { file = "LICENSE" }