diff --git a/.gitignore b/.gitignore
index 2323e4a..666b7c1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -325,3 +325,5 @@ thunderbird-langpacks-3.1.2-20100803.tar.bz2
 /thunderbird-langpacks-78.8.0-20210218.tar.xz
 /thunderbird-78.8.1.source.tar.xz
 /thunderbird-langpacks-78.8.1-20210315.tar.xz
+/thunderbird-78.10.1.source.tar.xz
+/thunderbird-langpacks-78.10.1-20210504.tar.xz
diff --git a/icecat-78.7.1-fix_error_template_with_C_linkage.patch b/icecat-78.7.1-fix_error_template_with_C_linkage.patch
deleted file mode 100644
index 43ee5e2..0000000
--- a/icecat-78.7.1-fix_error_template_with_C_linkage.patch
+++ /dev/null
@@ -1,16 +0,0 @@
---- a/other-licenses/atk-1.0/atk/atkobject.orig.h	2021-02-05 19:53:35.000000000 +0100
-+++ b/other-licenses/atk-1.0/atk/atkobject.h	2021-02-06 19:29:57.596256493 +0100
-@@ -20,11 +20,12 @@
- #ifndef __ATK_OBJECT_H__
- #define __ATK_OBJECT_H__
- 
-+#include <glib-object.h>
-+
- #ifdef __cplusplus
- extern "C" {
- #endif /* __cplusplus */
- 
--#include <glib-object.h>
- #include <atk/atkstate.h>
- #include <atk/atkrelationtype.h>
- 
diff --git a/mozilla-1556931-s390x-hidden-syms.patch b/mozilla-1556931-s390x-hidden-syms.patch
deleted file mode 100644
index c423d1f..0000000
--- a/mozilla-1556931-s390x-hidden-syms.patch
+++ /dev/null
@@ -1,25 +0,0 @@
-diff --git a/gfx/angle/checkout/src/compiler/translator/tree_util/IntermTraverse.cpp b/gfx/angle/checkout/src/compiler/translator/tree_util/IntermTraverse.cpp
-index c38baa12bffa8..2858a7bb4d319 100644
---- a/gfx/angle/checkout/src/compiler/translator/tree_util/IntermTraverse.cpp
-+++ b/gfx/angle/checkout/src/compiler/translator/tree_util/IntermTraverse.cpp
-@@ -45,16 +45,20 @@ void TIntermTraverser::traverse(T *node)
-             ++childIndex;
-         }
- 
-         if (visit && postVisit)
-             node->visit(PostVisit, this);
-     }
- }
- 
-+// Instantiate template for RewriteAtomicFunctionExpressions.
-+template
-+void TIntermTraverser::traverse(TIntermNode *);
-+
- void TIntermNode::traverse(TIntermTraverser *it)
- {
-     it->traverse(this);
- }
- 
- void TIntermSymbol::traverse(TIntermTraverser *it)
- {
-     TIntermTraverser::ScopedNodeInTraversalPath addToPath(it, this);
diff --git a/sources b/sources
index e15a3a6..0af79cb 100644
--- a/sources
+++ b/sources
@@ -1,3 +1,3 @@
-SHA512 (thunderbird-78.8.1.source.tar.xz) = 5158f7663acf3d00f45b457d1c172dcc95978d6782775faa4ec3995d3a799dfce668302e2c4b963a5607add831314fac76d516e45863a1971fbd4a6b0c4bdb10
-SHA512 (thunderbird-langpacks-78.8.1-20210315.tar.xz) = 33bae9f41e763841695e2bcb6e8b6327670f10566f01ad82a32dd44ff7d331ed36b953d7a96173cf133698cfcce191e60e8de484a6831678f6dbaf24483b68c7
+SHA512 (thunderbird-78.10.1.source.tar.xz) = fffae4bcf2411834a86b5d1fd7c3fa8dbc32763061de4afef44ec95d55a8c4ab94576f54bd8b8c9aef22e0c4a09b48a381ba2ddafc31be60ef79b81e6835e4db
+SHA512 (thunderbird-langpacks-78.10.1-20210504.tar.xz) = 9d75a6950aa001989c1d40a25d5fabdc2c20b9f0e5eae7578c1cf28a442bb83791e3a44a756062a8dc35a032f64856b49ffa4d6ae71a4561969f085a319aec9f
 SHA512 (cbindgen-vendor-0.14.3.tar.xz) = 33c8d28547674121f690eea0d3ebac33926a39caacac787bf8ed8b346478822e74da5a4a1f57ab4df4105fa8376739a2ece888845a85bc5712aaed20e4a508bc
diff --git a/thunderbird.spec b/thunderbird.spec
index 0404810..0999037 100644
--- a/thunderbird.spec
+++ b/thunderbird.spec
@@ -89,13 +89,13 @@ ExcludeArch: s390x
 
 Summary:        Mozilla Thunderbird mail/newsgroup client
 Name:           thunderbird
-Version:        78.8.1
-Release:        2%{?dist}
+Version:        78.10.1
+Release:        1%{?dist}
 URL:            http://www.mozilla.org/projects/thunderbird/
 License:        MPLv1.1 or GPLv2+ or LGPLv2+
 Source0:        ftp://ftp.mozilla.org/pub/thunderbird/releases/%{version}%{?pre_version}/source/thunderbird-%{version}%{?pre_version}.source.tar.xz
 %if %{build_langpacks}
-Source1:        thunderbird-langpacks-%{version}-20210315.tar.xz
+Source1:        thunderbird-langpacks-%{version}-20210504.tar.xz
 %endif
 Source3:        get-calendar-langpacks.sh
 Source4:        cbindgen-vendor-0.14.3.tar.xz
@@ -119,7 +119,6 @@ Patch417:       build-aarch64-user_vfp.patch
 Patch418:       mozilla-1512162.patch
 Patch419:       bindgen-d0dfc52706f23db9dc9d74642eeebd89d73cb8d0.patch
 Patch103:       rhbz-1219542-s390-build.patch
-Patch104:       icecat-78.7.1-fix_error_template_with_C_linkage.patch
 
 # PPC fix
 Patch304:       mozilla-1245783.patch
@@ -129,7 +128,6 @@ Patch307:       build-disable-elfhack.patch
 
 # Upstream patches
 Patch402:       mozilla-526293.patch
-Patch405:        mozilla-1556931-s390x-hidden-syms.patch
 Patch406:        mozilla-1170092.patch
 
 %if %{official_branding}
@@ -247,7 +245,6 @@ debug %{name}, you want to install %{name}-debuginfo instead.
 %ifarch s390
 %patch103 -p1 -b .rhbz-1219542-s390-build
 %endif
-%patch104 -p1 -b .c-linkages
 
 %patch304 -p1 -b .1245783
 # Patch for big endian platforms only
@@ -273,7 +270,6 @@ debug %{name}, you want to install %{name}-debuginfo instead.
 #cd ..
 
 %patch402 -p1 -b .526293
-%patch405 -p1 -b .1556931-s390x-hidden-syms
 %patch406 -p1 -b .1170092-etc-conf
 
 %if %{official_branding}
@@ -753,6 +749,9 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #===============================================================================
 
 %changelog
+* Tue May 04 2021 Jan Horak <jhorak@redhat.com> - 78.10.1-1
+- Update to 78.10.1 build1
+
 * Tue Mar 30 2021 Jonathan Wakely <jwakely@redhat.com> - 78.8.1-2
 - Rebuilt for removed libstdc++ symbol (#1937698)