diff --git a/app/build.gradle b/app/build.gradle
index 10402201..82463192 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -70,7 +70,7 @@ android {
         multiDexEnabled true
         minSdkVersion 17
         targetSdkVersion 29
-        versionCode 11
+        versionCode 12
         versionName getVersionName()
     }
     buildTypes {
@@ -101,15 +101,15 @@ dependencies {
     // To successfully use Firebase you'll need to download google-services.json from
     // your Firebase account (it's custom for each Firebase project/app). It should not
     // be checked in publicly.
-    implementation 'com.google.firebase:firebase-core:17.5.0'
-    implementation 'com.google.firebase:firebase-analytics:17.5.0'
-    implementation 'com.google.firebase:firebase-crashlytics:17.2.1'
+    implementation 'com.google.firebase:firebase-core:18.0.0'
+    implementation 'com.google.firebase:firebase-analytics:18.0.0'
+    implementation 'com.google.firebase:firebase-crashlytics:17.3.0'
 
     implementation 'org.greenrobot:eventbus:3.2.0'
 
     implementation 'androidx.appcompat:appcompat:1.2.0'
     implementation 'androidx.preference:preference:1.1.1'
-    implementation 'androidx.constraintlayout:constraintlayout:2.0.1'
+    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
     implementation 'androidx.legacy:legacy-support-v13:1.0.0'
     implementation "androidx.work:work-runtime:2.4.0"
 
@@ -117,17 +117,17 @@ dependencies {
     // If restored, proguard-rules.pro will need to be updated.
 
     // guava-jre does not work - must use -android
-    implementation 'com.google.guava:guava:29.0-android'
+    implementation 'com.google.guava:guava:30.1-android'
 
     implementation 'com.google.android.exoplayer:exoplayer-core:2.10.5'
-    implementation 'com.google.dagger:dagger:2.28.3'
+    implementation 'com.google.dagger:dagger:2.30.1'
 
-    implementation 'com.google.android.material:material:1.3.0-alpha02'
+    implementation 'com.google.android.material:material:1.3.0-beta01'
     implementation 'androidx.vectordrawable:vectordrawable:1.1.0'
     implementation 'androidx.legacy:legacy-support-v4:1.0.0'
     implementation 'androidx.recyclerview:recyclerview:1.1.0'
     implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
-    annotationProcessor 'com.google.dagger:dagger-compiler:2.28.3'
+    annotationProcessor 'com.google.dagger:dagger-compiler:2.30.1'
 
     implementation 'com.sun.mail:android-mail:1.6.5'
     implementation 'com.sun.mail:android-activation:1.6.5'
@@ -142,7 +142,7 @@ dependencies {
     implementation 'org.apache.commons:commons-text:1.9'
     implementation 'org.apache.commons:commons-compress:1.20'
     implementation 'org.apache.commons:commons-io:1.3.2'
-    implementation 'commons-net:commons-net:3.7'
+    implementation 'commons-net:commons-net:20030805.205232'
 
     // https://github.com/guardian/Option - needed by dirchooser (at runtime)
     // dirchooser only needed 4.4 and below
diff --git a/app/src/main/res/values-pl/strings.xml b/app/src/main/res/values-pl/strings.xml
index aa4931c7..ba1153ce 100644
--- a/app/src/main/res/values-pl/strings.xml
+++ b/app/src/main/res/values-pl/strings.xml
@@ -255,7 +255,7 @@
     <string name="status_name_check">Badanie:</string>
     <string name="status_name_error">Błąd:</string>
     <string name="dialog_cannot_make_group">Nie można utworzyć katalogu grupy.</string>
-    <string name="cannot_rename_group">Zmiana nazwy %s na %s nie powiodła się.</string>
+    <string name="cannot_rename_group">Zmiana nazwy %1$s na %2$s nie powiodła się.</string>
     <string name="grouping_error">Błędy podczas grupowania plików.</string>
     <string name="group_file_not_directory">Plik niekatalogowy rozgrupowany - powinien zostać usunięty z %1$s.</string>
     <string name="could_not_ungroup_file">Nie można rozgrupować książki %1$s. Plik zip?</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index a8016144..64d36326 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -285,7 +285,7 @@
     <string name="dialog_illegal_group">Must group at least two books</string>
     <string name="dialog_colliding_group">Group already exists; no action</string>
     <string name="dialog_cannot_make_group">Unable to create group directory.</string>
-    <string name="cannot_rename_group">Renaming %s to %s failed.</string>
+    <string name="cannot_rename_group">Renaming %1$s to %2$s failed.</string>
     <string name="grouping_error">Errors while grouping files.</string>
     <string name="group_file_not_directory">A non-directory file was ungrouped - it should be removed from %1$s.</string>
     <string name="could_not_ungroup_file">Book %1$s could not be ungrouped. A zip file?</string>
diff --git a/build.gradle b/build.gradle
index 53ff0cb0..ded9ae0e 100644
--- a/build.gradle
+++ b/build.gradle
@@ -6,10 +6,10 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.1'
         classpath 'com.neenbedankt.gradle.plugins:android-apt:1.4'
-        classpath 'com.google.gms:google-services:4.3.3'
-        classpath 'com.google.firebase:firebase-crashlytics-gradle:2.2.1'
+        classpath 'com.google.gms:google-services:4.3.4'
+        classpath 'com.google.firebase:firebase-crashlytics-gradle:2.4.1'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 1b16c34a..b64a7c1e 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,6 @@
+#Tue Dec 08 15:44:39 PST 2020
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.1.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-bin.zip