diff --git a/0001-Fix-build-with-GCC-11.patch b/0001-Fix-build-with-GCC-11.patch
deleted file mode 100644
index 1862f22..0000000
--- a/0001-Fix-build-with-GCC-11.patch
+++ /dev/null
@@ -1,25 +0,0 @@
-From 93d0a244b8494a436ce97343bb46174a731aaef1 Mon Sep 17 00:00:00 2001
-From: Christophe Giboudeaux <christophe@krop.fr>
-Date: Wed, 10 Feb 2021 11:28:02 +0100
-Subject: [PATCH] Fix build with GCC 11.
-
-The 'limits' header must be included explicitly.
----
- srtcore/sync.h | 1 +
- 1 file changed, 1 insertion(+)
-
-diff --git a/srtcore/sync.h b/srtcore/sync.h
-index 59c125a..9f01ca9 100644
---- a/srtcore/sync.h
-+++ b/srtcore/sync.h
-@@ -15,6 +15,7 @@
- //#define ENABLE_CXX17
- 
- #include <cstdlib>
-+#include <limits>
- #ifdef ENABLE_STDCXX_SYNC
- #include <chrono>
- #include <thread>
--- 
-2.30.0
-
diff --git a/baselibs.conf b/baselibs.conf
index 1cc8511..651bec0 100644
--- a/baselibs.conf
+++ b/baselibs.conf
@@ -1 +1 @@
-libsrt1
+libsrt1_4
diff --git a/srt-1.4.2.tar.gz b/srt-1.4.2.tar.gz
deleted file mode 100644
index 090b01b..0000000
--- a/srt-1.4.2.tar.gz
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:28a308e72dcbb50eb2f61b50cc4c393c413300333788f3a8159643536684a0c4
-size 1538231
diff --git a/srt-1.4.3.tar.gz b/srt-1.4.3.tar.gz
new file mode 100644
index 0000000..0ec1caa
--- /dev/null
+++ b/srt-1.4.3.tar.gz
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:c06e05664c71d635c37207a2b5a444f2c4a95950a3548402b3e0c524f735b33d
+size 1602671
diff --git a/srt.changes b/srt.changes
index a6035d1..8b91e72 100644
--- a/srt.changes
+++ b/srt.changes
@@ -1,3 +1,36 @@
+-------------------------------------------------------------------
+Tue May 11 23:55:15 UTC 2021 - Ferdinand Thiessen <rpm@fthiessen.de>
+
+- Update to version 1.4.3
+  * API/ABI/Integration Changes
+    * fixed/changed cast to bool instead of int in srt_getsockopt and 
+      srt_getsockflag API functions
+    * Fixed ABI compatibility around SRTO_BINDTODEVICE value
+      depending on ENABLE_EXPERIMENTAL_BONDING.
+    * Made SRT versioned SO named with major and minor
+  * New Features and Enhancements
+    * New API function srt_clock_type() to retrieve SRT internal
+      clock type.
+    * New SRTO_MININPUTBW socket option to control the minimum
+      allowed value of the input bitrate estimate.
+    * Run the accept hook (listener callback) before opening an
+      accepted socket providing an opportunity to set some ‘PRE’
+      options (like SRTO_RCVBUF).
+  * Fixed wrong check of common FEC configuration.
+  * Added handshake data check to prevent rogue handshakes.
+  * Fixed crash and hang up related to CSndLossList.
+  * Fixed miscalculations on extreme loss conditions in FEC.
+  * Fixed Data race when TLPKTDROP while checking loss for ACK
+    candidate.
+  * Fixed handshake IP parsing in IPv4-IPv6 connections.
+  * Fixed race starting and joining TSBPD thread.
+  * SRTO_RETRANSMITALGO becomes readable.
+  * Fixed sender hang up
+  * Fixed SRTO_MINVERSION not rejecting too old SRT version.
+  * Fixed a bug repeating a conclusion HS with rejection
+- Drop upstream merged 0001-Fix-build-with-GCC-11.patch
+  * https://github.com/Haivision/srt/pull/1806
+
 -------------------------------------------------------------------
 Wed Feb 10 10:29:12 UTC 2021 - Christophe Giboudeaux <christophe@krop.fr>
 
diff --git a/srt.spec b/srt.spec
index 17bc95b..220d374 100644
--- a/srt.spec
+++ b/srt.spec
@@ -16,10 +16,10 @@
 #
 
 
-%define sover 1
+%define sover 1_4
 
 Name:           srt
-Version:        1.4.2
+Version:        1.4.3
 Release:        0
 Summary:        Secure Reliable Transport (SRT)
 License:        MPL-2.0
@@ -27,8 +27,6 @@ Group:          Development/Libraries/C and C++
 URL:            https://www.srtalliance.org
 Source0:        https://github.com/Haivision/%{name}/archive/v%{version}.tar.gz#/%{name}-%{version}.tar.gz
 Source99:       baselibs.conf
-# PATCH-FIX-UPSTREAM
-Patch0:         0001-Fix-build-with-GCC-11.patch
 BuildRequires:  cmake
 BuildRequires:  fdupes
 BuildRequires:  gcc-c++