diff --git a/system/base/libnghttp2/pspec.xml b/system/base/libnghttp2/pspec.xml
index 2c6d8fc3..f6cdd021 100644
--- a/system/base/libnghttp2/pspec.xml
+++ b/system/base/libnghttp2/pspec.xml
@@ -12,7 +12,7 @@
         <IsA>app</IsA>
         <Summary> Experimental HTTP/2 client, server and proxy</Summary>
         <Description>Deneysel HTTP/2 istemci, sunucu ve proxy</Description>
-        <Archive sha1sum="422ab3102d4d22ff363fbababe9f66e2ae38db45" type="targz">https://github.com/nghttp2/nghttp2/archive/refs/tags/v1.64.0.tar.gz</Archive>
+        <Archive sha1sum="56c2e3f713e9f10891ca5ab7a18d86f1f181f22f" type="targz">https://github.com/nghttp2/nghttp2/archive/refs/tags/v1.66.0.tar.gz</Archive>
         <BuildDependencies>
             <Dependency>zlib-devel</Dependency>
             <Dependency versionFrom="2.10.3">libxml2-devel</Dependency>
@@ -51,6 +51,13 @@
     </Package>
 
     <History>
+        <Update release="17">
+            <Date>2025-07-09</Date>
+            <Version>1.66.0</Version>
+            <Comment>Version bump.</Comment>
+            <Name>Pisi Linux Community</Name>
+            <Email>admin@pisilinux.org</Email>
+        </Update>
         <Update release="16">
             <Date>2024-12-17</Date>
             <Version>1.64.0</Version>