diff --git a/postfix-3.5.4.tar.gz b/postfix-3.5.4.tar.gz
deleted file mode 100644
index 66372cf..0000000
--- a/postfix-3.5.4.tar.gz
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:fc2fb1cc27556aa2506bc287af04881cde07c83d5cb213ba835083b4bb796881
-size 4612431
diff --git a/postfix-3.5.4.tar.gz.sig b/postfix-3.5.4.tar.gz.sig
deleted file mode 100644
index f8260ed..0000000
--- a/postfix-3.5.4.tar.gz.sig
+++ /dev/null
@@ -1,7 +0,0 @@
------BEGIN PGP SIGNATURE-----
-Version: GnuPG v2.0.18 (FreeBSD)
-
-iFcDBQBe97rmDAtZDoDKFacRCpAZAP976DEZXG0dm9E3q6F2366U4K7e16NrnbiW
-NC1EYzCAEQD9ESyfNr2ZMS2iRsFqIiNM+h49AkYEKxQRYTeoGap2mRs=
-=kaGS
------END PGP SIGNATURE-----
diff --git a/postfix-3.5.6.tar.gz b/postfix-3.5.6.tar.gz
new file mode 100644
index 0000000..cac66b6
--- /dev/null
+++ b/postfix-3.5.6.tar.gz
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:8ec0aa671582adce157675e15da1dfa7ac2b5ff653571addba643735d0ec1e6a
+size 4613310
diff --git a/postfix-3.5.6.tar.gz.sig b/postfix-3.5.6.tar.gz.sig
new file mode 100644
index 0000000..c7f0d01
Binary files /dev/null and b/postfix-3.5.6.tar.gz.sig differ
diff --git a/postfix.changes b/postfix.changes
index bfb5f5e..0574755 100644
--- a/postfix.changes
+++ b/postfix.changes
@@ -1,3 +1,12 @@
+-------------------------------------------------------------------
+Sun Jul 26 21:22:39 UTC 2020 - Michael Ströder <michael@stroeder.com>
+
+- Update to 3.5.6 with following fixes:
+  * Workaround for unexpected TLS interoperability problems when Postfix
+    runs on OS distributions with system-wide OpenSSL configurations.
+  * Memory leaks in the Postfix TLS library, the largest one
+    involving multiple kBytes per peer certificate.
+
 -------------------------------------------------------------------
 Thu Jul 16 20:42:19 UTC 2020 - Arjen de Korte <suse+build@de-korte.org>
 
diff --git a/postfix.spec b/postfix.spec
index a2c569f..7d763e9 100644
--- a/postfix.spec
+++ b/postfix.spec
@@ -53,7 +53,7 @@
 %bcond_with    libnsl
 %endif
 Name:           postfix
-Version:        3.5.4
+Version:        3.5.6
 Release:        0
 Summary:        A fast, secure, and flexible mailer
 License:        IPL-1.0 OR EPL-2.0