diff --git a/CHANGELOG.md b/CHANGELOG.md
index a00abc7b..c4d2c0b8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+## [5.21.4- 5.21 Patch on Nov 28th 2025]
+See [all tickets marked for the 5.21.4 release](https://github.com/SDWebImage/SDWebImage/milestone/146)
+
+### Fixes
+- Using @synchronized to always lock the cache/loader operation to ensure thread-safe. Fix crash issue on iOS 26 #3855 #3849
+
 ## [5.21.3 - 5.21 Patch on Sep 9th 2025]
 See [all tickets marked for the 5.21.3 release](https://github.com/SDWebImage/SDWebImage/milestone/145)
 
diff --git a/SDWebImage.json b/SDWebImage.json
index d4d87eb6..7aa53c46 100644
--- a/SDWebImage.json
+++ b/SDWebImage.json
@@ -10,5 +10,6 @@
     "5.21.0": "https://github.com/SDWebImage/SDWebImage/releases/download/5.21.0/SDWebImage-dynamic.xcframework.zip",
     "5.21.1": "https://github.com/SDWebImage/SDWebImage/releases/download/5.21.1/SDWebImage-dynamic.xcframework.zip",
     "5.21.2": "https://github.com/SDWebImage/SDWebImage/releases/download/5.21.2/SDWebImage-dynamic.xcframework.zip",
-    "5.21.3": "https://github.com/SDWebImage/SDWebImage/releases/download/5.21.3/SDWebImage-dynamic.xcframework.zip"
+    "5.21.3": "https://github.com/SDWebImage/SDWebImage/releases/download/5.21.3/SDWebImage-dynamic.xcframework.zip",
+    "5.21.4": "https://github.com/SDWebImage/SDWebImage/releases/download/5.21.4/SDWebImage-dynamic.xcframework.zip"
 }
diff --git a/SDWebImage.podspec b/SDWebImage.podspec
index 27de3f09..587301fd 100644
--- a/SDWebImage.podspec
+++ b/SDWebImage.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name = 'SDWebImage'
-  s.version = '5.21.3'
+  s.version = '5.21.4'
 
   s.osx.deployment_target = '10.11'
   s.ios.deployment_target = '9.0'
diff --git a/WebImage/Info.plist b/WebImage/Info.plist
index 92dbd8f3..3134a44f 100644
--- a/WebImage/Info.plist
+++ b/WebImage/Info.plist
@@ -15,11 +15,11 @@
 	<key>CFBundlePackageType</key>
 	<string>FMWK</string>
 	<key>CFBundleShortVersionString</key>
-	<string>5.21.3</string>
+	<string>5.21.4</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>
-	<string>5.21.3</string>
+	<string>5.21.4</string>
 	<key>NSPrincipalClass</key>
 	<string></string>
 </dict>