diff --git a/.github/SECURITY.md b/.github/SECURITY.md
index b7b4094..40a5566 100644
--- a/.github/SECURITY.md
+++ b/.github/SECURITY.md
@@ -4,13 +4,13 @@
 
 The following versions of `ergebnis/environment-variables` have active support:
 
-- `^1.5.0`
+- `^1.6.0`
 
 ## Unsupported Versions
 
 The following versions of `ergebnis/environment-variables` have reached their end of life:
 
-- `<1.5.0`
+- `<1.6.0`
 
 ## Reporting a Vulnerability
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c680e97..b980449 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,7 +6,11 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## Unreleased
 
-For a full diff see [`1.5.0...main`][1.5.0...main].
+For a full diff see [`1.6.0...main`][1.6.0...main].
+
+## [`1.6.0`][1.6.0]
+
+For a full diff see [`1.5.0...1.6.0`][1.5.0...1.6.0].
 
 ### Added
 
@@ -86,6 +90,7 @@ For a full diff see [`c0c63bb...1.0.0`][c0c63bb...1.0.0].
 [1.3.0]: https://github.com/ergebnis/environment/variables/releases/tag/1.3.0
 [1.4.0]: https://github.com/ergebnis/environment/variables/releases/tag/1.4.0
 [1.5.0]: https://github.com/ergebnis/environment/variables/releases/tag/1.5.0
+[1.6.0]: https://github.com/ergebnis/environment/variables/releases/tag/1.6.0
 
 [c0c63bb...1.0.0]: https://github.com/ergebnis/environment-variables/compare/c0c63bb...1.0.0
 [1.0.0...1.1.0]: https://github.com/ergebnis/environment-variables/compare/1.0.0...1.1.0
@@ -93,7 +98,8 @@ For a full diff see [`c0c63bb...1.0.0`][c0c63bb...1.0.0].
 [1.2.0...1.3.0]: https://github.com/ergebnis/environment-variables/compare/1.2.0...1.3.0
 [1.3.0...1.4.0]: https://github.com/ergebnis/environment-variables/compare/1.3.0...1.4.0
 [1.4.0...1.5.0]: https://github.com/ergebnis/environment-variables/compare/1.4.0...1.5.0
-[1.5.0...main]: https://github.com/ergebnis/environment-variables/compare/1.5.0...main
+[1.5.0...1.6.0]: https://github.com/ergebnis/environment-variables/compare/1.5.0...1.6.0
+[1.6.0...main]: https://github.com/ergebnis/environment-variables/compare/1.6.0...main
 
 [#1]: https://github.com/ergebnis/environment-variables/pull/1
 [#2]: https://github.com/ergebnis/environment-variables/pull/2
diff --git a/composer.json b/composer.json
index ca451d4..69aa992 100644
--- a/composer.json
+++ b/composer.json
@@ -62,7 +62,7 @@
   },
   "extra": {
     "branch-alias": {
-      "dev-main": "1.5-dev"
+      "dev-main": "1.6-dev"
     },
     "composer-normalize": {
       "indent-size": 2,
diff --git a/composer.lock b/composer.lock
index 206334d..5c64d70 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "9b986f812586c165e0e98613d2bbc4bd",
+    "content-hash": "b86eff4b77534a5de128ac467d659d14",
     "packages": [],
     "packages-dev": [
         {