diff --git a/Mac/BuildScript/build-installer.py b/Mac/BuildScript/build-installer.py
index e7a2956c033187..3009b775f82dde 100755
--- a/Mac/BuildScript/build-installer.py
+++ b/Mac/BuildScript/build-installer.py
@@ -246,9 +246,9 @@ def library_recipes():
 
     result.extend([
           dict(
-              name="OpenSSL 3.5.8",
-              url="https://github.com/openssl/openssl/releases/download/openssl-3.5.8/openssl-3.5.8.tar.gz",
-              checksum="a8f84a39918ec6415ce765d9b429d313ba97b8143169c172e734b9514464f5b2",
+              name="OpenSSL 3.5.9",
+              url="https://github.com/openssl/openssl/releases/download/openssl-3.5.9/openssl-3.5.9.tar.gz",
+              checksum="603f5602e2eef00d77fbd429d34dcd5822bb301757a1bc9cdb24c670f1eb859a",
               buildrecipe=build_universal_openssl,
               configure=None,
               install=None,
diff --git a/Misc/NEWS.d/next/macOS/2026-09-23-12-08-52.gh-issue-158010.Q8fLPe.rst b/Misc/NEWS.d/next/macOS/2026-09-23-12-08-52.gh-issue-158010.Q8fLPe.rst
index 4a30fad5a26c09..1475e331d9e1b4 100644
--- a/Misc/NEWS.d/next/macOS/2026-09-23-12-08-52.gh-issue-158010.Q8fLPe.rst
+++ b/Misc/NEWS.d/next/macOS/2026-09-23-12-08-52.gh-issue-158010.Q8fLPe.rst
@@ -1,2 +1,2 @@
-Updated macOS installer to use OpenSSL 3.5.8, jumping from the 3.0 series
+Updated macOS installer to use OpenSSL 3.5.9, jumping from the 3.0 series
 to 3.5 after 3.0's end of public support in September 2026.