diff --git a/app/src/main/assets/pl-changelog.html b/app/src/main/assets/pl-changelog.html
index 26e6b29f..2548b456 100644
--- a/app/src/main/assets/pl-changelog.html
+++ b/app/src/main/assets/pl-changelog.html
@@ -1,4 +1,4 @@
-<h3>Wersja 4.12, 2022-09-21</h3>
+<h3>Wersja 4.12.1, 2022-09-23</h3>
 <ul>
     <li>Vulcan UONET+: naprawiono działanie systemu wiadomości. @Antoni-Czaplicki</li>
     <li>Vulcan UONET+: naprawiono błędy wersji 4.11.9 i starszych.</li>
diff --git a/app/src/main/cpp/szkolny-signing.cpp b/app/src/main/cpp/szkolny-signing.cpp
index d1afa130..639ca56e 100644
--- a/app/src/main/cpp/szkolny-signing.cpp
+++ b/app/src/main/cpp/szkolny-signing.cpp
@@ -9,7 +9,7 @@
 
 /*secret password - removed for source code publication*/
 static toys AES_IV[16] = {
-	0x9f, 0x7e, 0x7a, 0xcd, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff  };
+	0xdf, 0xe4, 0x2d, 0xa3, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff  };
 
 unsigned char *agony(unsigned int laugh, unsigned char *box, unsigned char *heat);
 
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/interceptor/Signing.kt b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/interceptor/Signing.kt
index 79ccf534..24f28c3c 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/interceptor/Signing.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/interceptor/Signing.kt
@@ -46,6 +46,6 @@ object Signing {
 
     /*fun provideKey(param1: String, param2: Long): ByteArray {*/
     fun pleaseStopRightNow(param1: String, param2: Long): ByteArray {
-        return "$param1.MTIzNDU2Nzg5MDRaOIVjKV===.$param2".sha256()
+        return "$param1.MTIzNDU2Nzg5MDJgAI/q8c===.$param2".sha256()
     }
 }
diff --git a/build.gradle b/build.gradle
index 1f505e33..7b8133d1 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,8 +5,8 @@ buildscript {
         kotlin_version = '1.6.10'
 
         release = [
-                versionName: "4.12",
-                versionCode: 4120099
+                versionName: "4.12.1",
+                versionCode: 4120199
         ]
 
         setup = [