diff --git a/CHANGELOG.md b/CHANGELOG.md
index 746fc37..1dfa30a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # CHANGELOG
 
+## 1.5.1 - Upcoming
+
+* Require `guzzlehttp/guzzle` ^7.12.3 and `guzzlehttp/psr7` ^2.12.3
+
 ## 1.5.0 - 2026-06-02
 
 * Require `guzzlehttp/guzzle` ^7.11, `guzzlehttp/promises` ^2.5, and `guzzlehttp/psr7` ^2.11
diff --git a/composer.json b/composer.json
index e155094..2276221 100644
--- a/composer.json
+++ b/composer.json
@@ -26,9 +26,9 @@
     ],
     "require": {
         "php": "^7.2.5 || ^8.0",
-        "guzzlehttp/guzzle": "^7.11",
+        "guzzlehttp/guzzle": "^7.12.3",
         "guzzlehttp/promises": "^2.5",
-        "guzzlehttp/psr7": "^2.11",
+        "guzzlehttp/psr7": "^2.12.3",
         "symfony/deprecation-contracts": "^2.5 || ^3.0"
     },
     "require-dev": {