diff --git a/MozillaThunderbird.changes b/MozillaThunderbird.changes
index fa31bbf..5722a7d 100644
--- a/MozillaThunderbird.changes
+++ b/MozillaThunderbird.changes
@@ -1,3 +1,18 @@
+-------------------------------------------------------------------
+Fri Dec 17 14:19:48 UTC 2021 - Wolfgang Rosenauer <wr@rosenauer.org>
+
+- Mozilla Thunderbird 91.4.1
+  * several fixes as outlined here
+    https://www.thunderbird.net/en-US/thunderbird/91.4.1/releasenotes/
+  MFSA 2021-55 (bsc#1193845)
+  * CVE-2021-4126 (bmo#1732310)
+    OpenPGP signature status doesn't consider additional message
+    content
+  * CVE-2021-44538 (bmo#1744056)
+    Matrix chat library libolm bundled with Thunderbird
+    vulnerable to a buffer overflow
+- updated _constraints
+
 -------------------------------------------------------------------
 Thu Dec  2 08:55:33 UTC 2021 - Wolfgang Rosenauer <wr@rosenauer.org>
 
diff --git a/MozillaThunderbird.spec b/MozillaThunderbird.spec
index 0df094c..4be215e 100644
--- a/MozillaThunderbird.spec
+++ b/MozillaThunderbird.spec
@@ -26,8 +26,8 @@
 # major 69
 # mainver %major.99
 %define major          91
-%define mainver        %major.4.0
-%define orig_version   91.4.0
+%define mainver        %major.4.1
+%define orig_version   91.4.1
 %define orig_suffix    %{nil}
 %define update_channel release
 %define source_prefix  thunderbird-%{orig_version}
diff --git a/_constraints b/_constraints
index c0e44b1..1bbe0c7 100644
--- a/_constraints
+++ b/_constraints
@@ -28,17 +28,31 @@
     </conditions>
     <hardware>
       <memory>
-        <size unit="G">12</size>
+        <size unit="G">16</size>
       </memory>
     </hardware>
   </overwrite>
+  <overwrite>
+    <conditions>
+      <arch>ppc64</arch>
+      <arch>ppc64le</arch>
+    </conditions>
+    <hardware>
+      <physicalmemory>
+        <size unit="G">11</size>
+      </physicalmemory>
+      <memoryperjob>
+        <size unit="M">2500</size>
+      </memoryperjob>
+    </hardware>
+  </overwrite>
   <overwrite>
     <conditions>
       <arch>x86_64</arch>
     </conditions>
     <hardware>
       <memory>
-        <size unit="G">16</size>
+        <size unit="G">18</size>
       </memory>
     </hardware>
   </overwrite>
diff --git a/l10n-91.4.0.tar.xz b/l10n-91.4.0.tar.xz
deleted file mode 100644
index 925befb..0000000
--- a/l10n-91.4.0.tar.xz
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:9581d0d2100170cdd918fa986c72b5c52dc925f69dafb6cbd29d17a371cf644d
-size 28620444
diff --git a/l10n-91.4.1.tar.xz b/l10n-91.4.1.tar.xz
new file mode 100644
index 0000000..83e9734
--- /dev/null
+++ b/l10n-91.4.1.tar.xz
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:58357a0157b34de992f4a7c2c5a35bcbd956d11b0b0061df97bcfcefb4a594da
+size 28646024
diff --git a/tar_stamps b/tar_stamps
index e7d248b..1c5f6c3 100644
--- a/tar_stamps
+++ b/tar_stamps
@@ -1,10 +1,10 @@
 PRODUCT="thunderbird"
 CHANNEL="esr91"
-VERSION="91.4.0"
+VERSION="91.4.1"
 VERSION_SUFFIX=""
-PREV_VERSION="91.3.2"
+PREV_VERSION="91.4.0"
 PREV_VERSION_SUFFIX=""
 #SKIP_LOCALES="" # Uncomment to skip l10n and compare-locales-generation
 RELEASE_REPO="https://hg.mozilla.org/releases/comm-esr91"
-RELEASE_TAG="ab6dfcf3a37bf53aac1a9d632d45ee51047050bb"
-RELEASE_TIMESTAMP="20211203141721"
+RELEASE_TAG="11529576c3a7d89514771d1e0f5fa116eef29b81"
+RELEASE_TIMESTAMP="20211216022855"
diff --git a/thunderbird-91.4.0.source.tar.xz b/thunderbird-91.4.0.source.tar.xz
deleted file mode 100644
index 61d57ba..0000000
--- a/thunderbird-91.4.0.source.tar.xz
+++ /dev/null
@@ -1,3 +0,0 @@
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-oid sha256:3cb5280b32e66e178f37fd1b57cc4390f2c986ea4162972cc277c45a253de1a6
-size 401512224
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deleted file mode 100644
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+++ /dev/null
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new file mode 100644
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