diff --git a/deps/zlib/BUILD.gn b/deps/zlib/BUILD.gn
index afd3e8cc0f38e9..eff72b22a29bb0 100644
--- a/deps/zlib/BUILD.gn
+++ b/deps/zlib/BUILD.gn
@@ -67,15 +67,10 @@ source_set("zlib_common_headers") {
   ]
 }
 
-use_arm_neon_optimizations = false
-if ((current_cpu == "arm" || current_cpu == "arm64") &&
-    !(is_win && !is_clang)) {
-  # TODO(ritownsend@google.com): Optimizations temporarily disabled for
-  # Windows on Arm MSVC builds, see http://crbug.com/v8/10012.
-  if (arm_use_neon) {
-    use_arm_neon_optimizations = true
-  }
-}
+# TODO(ritownsend@google.com): Optimizations temporarily disabled for
+# Windows on Arm MSVC builds, see http://crbug.com/v8/10012.
+use_arm_neon_optimizations =
+    (current_cpu == "arm" || current_cpu == "arm64") && !(is_win && !is_clang)
 
 use_x86_x64_optimizations =
     (current_cpu == "x86" || current_cpu == "x64") && !is_ios
@@ -367,7 +362,7 @@ component("zlib") {
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ "//build/config/compiler:no_chromium_code" ]
 
-  if (zlib_symbols_visible) {
+  if (is_posix && zlib_symbols_visible) {
     configs -= [ "//build/config/gcc:symbol_visibility_hidden" ]
     configs += [ "//build/config/gcc:symbol_visibility_default" ]
   }
diff --git a/src/zlib_version.h b/src/zlib_version.h
index 24b241fe6ef844..7ce58e3077bade 100644
--- a/src/zlib_version.h
+++ b/src/zlib_version.h
@@ -2,5 +2,5 @@
 // Refer to tools/dep_updaters/update-zlib.sh
 #ifndef SRC_ZLIB_VERSION_H_
 #define SRC_ZLIB_VERSION_H_
-#define ZLIB_VERSION "1.3.1-63d7e16"
+#define ZLIB_VERSION "1.3.1-e00f703"
 #endif  // SRC_ZLIB_VERSION_H_