diff --git a/docs-src/config.toml b/docs-src/config.toml
index 5b6b051d..ebc10686 100644
--- a/docs-src/config.toml
+++ b/docs-src/config.toml
@@ -4,7 +4,7 @@ langs = ["en", "ja"]
 
 [site]
 title = "cpp-httplib"
-version = "0.56.0"
+version = "0.57.0"
 hostname = "https://yhirose.github.io"
 base_path = "/cpp-httplib"
 footer_message = "© 2026 Yuji Hirose. All rights reserved."
diff --git a/httplib.h b/httplib.h
index 4f221f84..246a1acd 100644
--- a/httplib.h
+++ b/httplib.h
@@ -8,8 +8,8 @@
 #ifndef CPPHTTPLIB_HTTPLIB_H
 #define CPPHTTPLIB_HTTPLIB_H
 
-#define CPPHTTPLIB_VERSION "0.56.0"
-#define CPPHTTPLIB_VERSION_NUM "0x003800"
+#define CPPHTTPLIB_VERSION "0.57.0"
+#define CPPHTTPLIB_VERSION_NUM "0x003900"
 
 #ifdef _WIN32
 #if defined(_WIN32_WINNT) && _WIN32_WINNT < 0x0A00