diff --git a/README.org b/README.org
index 1ac6211..796dbfb 100644
--- a/README.org
+++ b/README.org
@@ -17,7 +17,7 @@ For Zig =0.15=, use the [[https://github.com/jiacai2050/zig-curl/tree/0.15][0.15
 The vendored libraries consist of:
 | Library | Version |
 |---------+---------|
-| libcurl | [[https://github.com/curl/curl/tree/curl-8_19_0][8.19.0]]   |
+| libcurl | [[https://github.com/curl/curl/tree/curl-8_21_0][8.21.0]]   |
 | zlib    | [[https://github.com/madler/zlib/tree/v1.3.1][1.3.1]]   |
 | mbedtls | [[https://github.com/Mbed-TLS/mbedtls/tree/v3.6.0][3.6.0]]   |
 
diff --git a/build.zig.zon b/build.zig.zon
index 147cb84..7a75129 100644
--- a/build.zig.zon
+++ b/build.zig.zon
@@ -11,10 +11,10 @@
         "LICENSE",
     },
     .dependencies = .{
-        // https://github.com/curl/curl/releases/tag/curl-8_19_0
+        // https://github.com/curl/curl/releases/tag/curl-8_21_0
         .curl = .{
-            .url = "https://github.com/curl/curl/releases/download/curl-8_19_0/curl-8.19.0.tar.gz",
-            .hash = "N-V-__8AAM-tPgFSsje3FI7iURLjDLSOquhtONinvYZp3AHh",
+            .url = "https://github.com/curl/curl/releases/download/curl-8_21_0/curl-8.21.0.tar.gz",
+            .hash = "N-V-__8AALEMTAGmPn1iGtLTj0oIiySFaGadtszadQ_-WeEo",
             .lazy = true,
         },
         // https://github.com/madler/zlib/releases/tag/v1.3.1
diff --git a/libs/curl.zig b/libs/curl.zig
index e583a4a..ae003e9 100644
--- a/libs/curl.zig
+++ b/libs/curl.zig
@@ -265,7 +265,6 @@ const srcs = &.{
     "lib/http1.c",
     "lib/multi.c",
     "lib/gopher.c",
-    "lib/noproxy.c",
     "lib/curl_sasl.c",
     "lib/dict.c",
     "lib/bufref.c",
@@ -285,6 +284,7 @@ const srcs = &.{
     "lib/vtls/x509asn1.c",
     "lib/vtls/keylog.c",
     "lib/vtls/vtls_scache.c",
+    "lib/vtls/vtls_config.c",
     "lib/cshutdn.c",
     "lib/multi_ev.c",
     "lib/curlx/wait.c",
@@ -329,9 +329,9 @@ const srcs = &.{
     "lib/curlx/basename.c",
     "lib/curlx/snprintf.c",
     "lib/memdebug.c",
-    "lib/vquic/curl_ngtcp2.c",
+    "lib/vquic/cf-ngtcp2.c",
     "lib/vquic/vquic.c",
-    "lib/vquic/curl_quiche.c",
+    "lib/vquic/cf-quiche.c",
     "lib/getinfo.c",
     "lib/http2.c",
     "lib/vauth/oauth2.c",
@@ -351,7 +351,6 @@ const srcs = &.{
     "lib/bufq.c",
     "lib/curl_get_line.c",
     "lib/hostip4.c",
-    "lib/curl_rtmp.c",
     "lib/amigaos.c",
     "lib/curl_share.c",
     "lib/curlx/warnless.c",
@@ -415,4 +414,14 @@ const srcs = &.{
     "lib/transfer.c",
     "lib/hmac.c",
     "lib/fileinfo.c",
+    "lib/dnscache.c",
+    "lib/cf-dns.c",
+    "lib/protocol.c",
+    "lib/cf-setup.c",
+    "lib/creds.c",
+    "lib/peer.c",
+    "lib/cf-recvbuf.c",
+    "lib/proxy.c",
+    "lib/thrdqueue.c",
+    "lib/thrdpool.c"
 };