diff --git a/.gitignore b/.gitignore
index 3d6fc59..284db69 100644
--- a/.gitignore
+++ b/.gitignore
@@ -335,3 +335,5 @@ thunderbird-langpacks-3.1.2-20100803.tar.bz2
 /thunderbird-langpacks-91.0.2-20210823.tar.xz
 /thunderbird-91.0.3.source.tar.xz
 /thunderbird-langpacks-91.0.3-20210826.tar.xz
+/thunderbird-91.1.0.source.tar.xz
+/thunderbird-langpacks-91.1.0-20210907.tar.xz
diff --git a/build-aarch64-user_vfp.patch b/build-aarch64-user_vfp.patch
deleted file mode 100644
index 85e72c7..0000000
--- a/build-aarch64-user_vfp.patch
+++ /dev/null
@@ -1,12 +0,0 @@
-diff -up thunderbird-68.0/js/src/wasm/WasmSignalHandlers.cpp.aarch64-user_vfp thunderbird-68.0/js/src/wasm/WasmSignalHandlers.cpp
---- thunderbird-68.0/js/src/wasm/WasmSignalHandlers.cpp.aarch64-user_vfp	2019-09-05 08:57:46.443137916 +0200
-+++ thunderbird-68.0/js/src/wasm/WasmSignalHandlers.cpp	2019-09-05 08:58:07.776196823 +0200
-@@ -244,7 +244,7 @@ using mozilla::DebugOnly;
- // emulation here.
- 
- #if defined(__linux__) && defined(__arm__)
--#  define WASM_EMULATE_ARM_UNALIGNED_FP_ACCESS
-+//#  define WASM_EMULATE_ARM_UNALIGNED_FP_ACCESS
- #endif
- 
- #ifdef WASM_EMULATE_ARM_UNALIGNED_FP_ACCESS
diff --git a/firefox-glibc-dynstack.patch b/firefox-glibc-dynstack.patch
deleted file mode 100644
index b0487d7..0000000
--- a/firefox-glibc-dynstack.patch
+++ /dev/null
@@ -1,64 +0,0 @@
-diff -ur firefox-90.0.orig/js/xpconnect/src/XPCJSContext.cpp firefox-90.0/js/xpconnect/src/XPCJSContext.cpp
---- firefox-90.0.orig/js/xpconnect/src/XPCJSContext.cpp	2021-07-05 21:16:02.000000000 +0200
-+++ firefox-90.0/js/xpconnect/src/XPCJSContext.cpp	2021-07-19 15:01:24.083460460 +0200
-@@ -85,14 +85,6 @@
- using namespace xpc;
- using namespace JS;
- 
--// The watchdog thread loop is pretty trivial, and should not require much stack
--// space to do its job. So only give it 32KiB or the platform minimum.
--#if !defined(PTHREAD_STACK_MIN)
--#  define PTHREAD_STACK_MIN 0
--#endif
--static constexpr size_t kWatchdogStackSize =
--    PTHREAD_STACK_MIN < 32 * 1024 ? 32 * 1024 : PTHREAD_STACK_MIN;
--
- static void WatchdogMain(void* arg);
- class Watchdog;
- class WatchdogManager;
-@@ -163,7 +155,7 @@
-       // watchdog, we need to join it on shutdown.
-       mThread = PR_CreateThread(PR_USER_THREAD, WatchdogMain, this,
-                                 PR_PRIORITY_NORMAL, PR_GLOBAL_THREAD,
--                                PR_JOINABLE_THREAD, kWatchdogStackSize);
-+                                PR_JOINABLE_THREAD, 0);
-       if (!mThread) {
-         MOZ_CRASH("PR_CreateThread failed!");
-       }
-Only in firefox-90.0/js/xpconnect/src: XPCJSContext.cpp.firefox-glibc-dynstack
-diff -ur firefox-90.0.orig/security/sandbox/linux/launch/SandboxLaunch.cpp firefox-90.0/security/sandbox/linux/launch/SandboxLaunch.cpp
---- firefox-90.0.orig/security/sandbox/linux/launch/SandboxLaunch.cpp	2021-07-05 18:20:36.000000000 +0200
-+++ firefox-90.0/security/sandbox/linux/launch/SandboxLaunch.cpp	2021-07-20 08:39:17.272136982 +0200
-@@ -501,8 +501,7 @@
- MOZ_NEVER_INLINE MOZ_ASAN_BLACKLIST static pid_t DoClone(int aFlags,
-                                                          jmp_buf* aCtx) {
-   static constexpr size_t kStackAlignment = 16;
--  uint8_t miniStack[PTHREAD_STACK_MIN]
--      __attribute__((aligned(kStackAlignment)));
-+  uint8_t miniStack[4096] __attribute__((aligned(kStackAlignment)));
- #ifdef __hppa__
-   void* stackPtr = miniStack;
- #else
-@@ -523,13 +522,19 @@
-                                CLONE_CHILD_CLEARTID;
-   MOZ_RELEASE_ASSERT((aFlags & kBadFlags) == 0);
- 
-+  // Block signals due to small stack in DoClone.
-+  sigset_t oldSigs;
-+  BlockAllSignals(&oldSigs);
-+
-+  int ret = 0;
-   jmp_buf ctx;
-   if (setjmp(ctx) == 0) {
-     // In the parent and just called setjmp:
--    return DoClone(aFlags | SIGCHLD, &ctx);
-+    ret = DoClone(aFlags | SIGCHLD, &ctx);
-   }
-+  RestoreSignals(&oldSigs);
-   // In the child and have longjmp'ed:
--  return 0;
-+  return ret;
- }
- 
- static bool WriteStringToFile(const char* aPath, const char* aStr,
-Only in firefox-90.0/security/sandbox/linux/launch: SandboxLaunch.cpp~
diff --git a/sources b/sources
index 8c72b92..1779473 100644
--- a/sources
+++ b/sources
@@ -1,3 +1,3 @@
-SHA512 (thunderbird-91.0.3.source.tar.xz) = 1c7b4c11066ab64ee1baa9f07bc6bd4478c2ece0bcf8ac381c2f0774582bb781b8151b54326cd38742d039c5de718022649d804dfceaf142863249b1edb68e1e
-SHA512 (thunderbird-langpacks-91.0.3-20210826.tar.xz) = 685bd8468d9c6b3ebbc680c69bf2ea96c2cd623a79aaa272d3acbfe3a2a8d77dcc225d09fb5a314cccfd5420361fbc643c662e0eeeb60685438913971c0d92fa
+SHA512 (thunderbird-91.1.0.source.tar.xz) = c465ff25d67c5c28db53d3b1ccda10a743276e58c693406bf31bde0253f34123348180ae18765bd60b958c050e3a874dd69ac82d7612007a8c7a2e25939840ff
+SHA512 (thunderbird-langpacks-91.1.0-20210907.tar.xz) = 1c859be87b9fe9fa944917c2c5ed29fde9618a149fd303784f7c2f90eb281bf33f8460e958d6894b34bc1d1df06cb2abf605e92c22effbf08fc80bf1f583f94f
 SHA512 (cbindgen-vendor.tar.xz) = 105a7d93d63920d8c232421a29f6330c171343d27807feaeadb1737374e5cf1d48916cb6e9ce04773dd81bb3c52a6f5cef12e633b0922cb9f91ca99acc9e4b78
diff --git a/thunderbird.spec b/thunderbird.spec
index 76ae2d9..5c98e50 100644
--- a/thunderbird.spec
+++ b/thunderbird.spec
@@ -89,13 +89,13 @@ ExcludeArch: s390x
 
 Summary:        Mozilla Thunderbird mail/newsgroup client
 Name:           thunderbird
-Version:        91.0.3
-Release:        2%{?dist}
+Version:        91.1.0
+Release:        1%{?dist}
 URL:            http://www.mozilla.org/projects/thunderbird/
 License:        MPLv1.1 or GPLv2+ or LGPLv2+
 Source0:        https://archive.mozilla.org/pub/thunderbird/releases/%{version}%{?pre_version}/source/thunderbird-%{version}%{?pre_version}.source.tar.xz
 %if %{build_langpacks}
-Source1:        thunderbird-langpacks-%{version}-20210826.tar.xz
+Source1:        thunderbird-langpacks-%{version}-20210907.tar.xz
 %endif
 Source3:        get-calendar-langpacks.sh
 Source4:        cbindgen-vendor.tar.xz
@@ -115,11 +115,9 @@ Patch9:         mozilla-build-arm.patch
 Patch226:       rhbz-1354671.patch
 Patch415:       Bug-1238661---fix-mozillaSignalTrampoline-to-work-.patch
 Patch416:       firefox-SIOCGSTAMP.patch
-Patch417:       build-aarch64-user_vfp.patch
 Patch418:       mozilla-1512162.patch
 Patch419:       bindgen-d0dfc52706f23db9dc9d74642eeebd89d73cb8d0.patch
 Patch103:       rhbz-1219542-s390-build.patch
-Patch104:       firefox-glibc-dynstack.patch
 
 # PPC fix
 Patch304:       mozilla-1245783.patch
@@ -263,7 +261,6 @@ debug %{name}, you want to install %{name}-debuginfo instead.
 %ifarch s390
 %patch103 -p1 -b .rhbz-1219542-s390-build
 %endif
-%patch104 -p1 -b .dynstack
 
 %if 0%{?fedora} >= 35
 # since python3.10 we need to use  `from collections.abc` instead of `from collections`. 
@@ -282,7 +279,6 @@ debug %{name}, you want to install %{name}-debuginfo instead.
 %patch415 -p1 -b .mozilla-1238661
 %endif
 #FIXME %patch416 -p1 -b .SIOCGSTAMP
-%patch417 -p1 -b .aarch64-user_vfp
 %patch418 -p1 -b .mozbz-1512162
 # most likely fixed
 #%patch419 -p1 -b .bindgen
@@ -769,6 +765,9 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #===============================================================================
 
 %changelog
+* Tue Sep 07 2021 Jan Horak <jhorak@redhat.com> - 91.1.0-1
+- Update to 91.1.0 build2
+
 * Thu Aug 26 2021 Jan Horak <jhorak@redhat.com> - 91.0.3-2
 - Update to 91.0.3 build1