diff --git a/library/README.md b/library/README.md
index d731c67f3f..a0220d979c 100644
--- a/library/README.md
+++ b/library/README.md
@@ -15,7 +15,7 @@ ezc/Graph       | Zeta Graph      | 1.5.2     | unpatched [1]
 phpmailer       | PHPMailer       | 5.2.21    | unpatched [1]
 rssbuilder      | RSSBuilder      | 2.2.1     | patched [2]
 utf8            | phputf8         | 0.5       | unpatched
-securimage      | PHP Captcha     | 3.6.4     | unpatched [1]
+securimage      | PHP Captcha     | 3.6.5     | unpatched [1]
 
 **Notes**
 
diff --git a/library/securimage b/library/securimage
index 470adfd248..4999d5d7bb 160000
--- a/library/securimage
+++ b/library/securimage
@@ -1 +1 @@
-Subproject commit 470adfd248d11fd07a5c4fc486570655fded0f4b
+Subproject commit 4999d5d7bb961d2a4758b56ba28057aa5e3606d1