diff --git a/.github/workflows/appimage.yml b/.github/workflows/appimage.yml
index ee89a17ec..15c1ea3a9 100644
--- a/.github/workflows/appimage.yml
+++ b/.github/workflows/appimage.yml
@@ -10,8 +10,8 @@ on:
         required: false
 
 env:
-  JAVA_DIST: 'temurin'
-  JAVA_VERSION: 20
+  JAVA_DIST: 'zulu'
+  JAVA_VERSION: 21
 
 jobs:
   get-version:
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 1416c3809..fbb57cbbf 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -6,8 +6,8 @@ on:
     types: [labeled]
 
 env:
-  JAVA_DIST: 'temurin'
-  JAVA_VERSION: 20
+  JAVA_DIST: 'zulu'
+  JAVA_VERSION: 21
 
 defaults:
   run:
diff --git a/.github/workflows/debian.yml b/.github/workflows/debian.yml
index 6c1a68944..054d6cadf 100644
--- a/.github/workflows/debian.yml
+++ b/.github/workflows/debian.yml
@@ -16,8 +16,9 @@ on:
         type: boolean
 
 env:
-  JAVA_DIST: 'temurin'
-  JAVA_VERSION: 20
+  JAVA_DIST: 'zulu'
+  JAVA_VERSION: 21
+  COFFEELIBS_JDK_VERSION: 21
   OPENJFX_JMODS_AMD64: 'https://download2.gluonhq.com/openjfx/20.0.2/openjfx-20.0.2_linux-x64_bin-jmods.zip'
   OPENJFX_JMODS_AMD64_HASH: 'f522ac2ae4bdd61f0219b7b8d2058ff72a22f36a44378453bcfdcd82f8f5e08c'
   OPENJFX_JMODS_AARCH64: 'https://download2.gluonhq.com/openjfx/20.0.2/openjfx-20.0.2_linux-aarch64_bin-jmods.zip'
@@ -42,7 +43,7 @@ jobs:
         run: |
           sudo add-apt-repository ppa:coffeelibs/openjdk
           sudo apt-get update
-          sudo apt-get install debhelper devscripts dput coffeelibs-jdk-${{ env.JAVA_VERSION }} libgtk2.0-0
+          sudo apt-get install debhelper devscripts dput coffeelibs-jdk-${{ env.COFFEELIBS_JDK_VERSION }} libgtk2.0-0
       - name: Setup Java
         uses: actions/setup-java@v3
         with:
diff --git a/.github/workflows/get-version.yml b/.github/workflows/get-version.yml
index f05d7742a..1bed1cff8 100644
--- a/.github/workflows/get-version.yml
+++ b/.github/workflows/get-version.yml
@@ -22,8 +22,8 @@ on:
         value: ${{ jobs.determine-version.outputs.type }}
 
 env:
-  JAVA_DIST: 'temurin'
-  JAVA_VERSION: 20
+  JAVA_DIST: 'zulu'
+  JAVA_VERSION: 21
 
 jobs:
   determine-version:
diff --git a/.github/workflows/mac-dmg.yml b/.github/workflows/mac-dmg.yml
index ea6fed274..8db4296d9 100644
--- a/.github/workflows/mac-dmg.yml
+++ b/.github/workflows/mac-dmg.yml
@@ -15,8 +15,8 @@ on:
         type: boolean
 
 env:
-  JAVA_DIST: 'temurin'
-  JAVA_VERSION: 20
+  JAVA_DIST: 'zulu'
+  JAVA_VERSION: 21
 
 jobs:
   get-version:
diff --git a/.github/workflows/pullrequest.yml b/.github/workflows/pullrequest.yml
index 9b615756a..931817418 100644
--- a/.github/workflows/pullrequest.yml
+++ b/.github/workflows/pullrequest.yml
@@ -4,8 +4,8 @@ on:
   pull_request:
 
 env:
-  JAVA_DIST: 'temurin'
-  JAVA_VERSION: 20
+  JAVA_DIST: 'zulu'
+  JAVA_VERSION: 21
 
 defaults:
   run:
diff --git a/.github/workflows/win-exe.yml b/.github/workflows/win-exe.yml
index 024f38696..2b72a50a8 100644
--- a/.github/workflows/win-exe.yml
+++ b/.github/workflows/win-exe.yml
@@ -14,8 +14,8 @@ on:
 
 
 env:
-  JAVA_DIST: 'temurin'
-  JAVA_VERSION: 20
+  JAVA_DIST: 'zulu'
+  JAVA_VERSION: 21
   OPENJFX_JMODS_AMD64: 'https://download2.gluonhq.com/openjfx/20.0.2/openjfx-20.0.2_windows-x64_bin-jmods.zip'
   OPENJFX_JMODS_AMD64_HASH: '18625bbc13c57dbf802486564247a8d8cab72ec558c240a401bf6440384ebd77'
 
diff --git a/.idea/compiler.xml b/.idea/compiler.xml
index 1d25cbef3..df360a26d 100644
--- a/.idea/compiler.xml
+++ b/.idea/compiler.xml
@@ -14,10 +14,10 @@
         <option name="dagger.fastInit" value="enabled" />
         <option name="dagger.formatGeneratedSource" value="enabled" />
         <processorPath useClasspath="false">
-          <entry name="$MAVEN_REPOSITORY$/com/google/dagger/dagger-compiler/2.45/dagger-compiler-2.45.jar" />
-          <entry name="$MAVEN_REPOSITORY$/com/google/dagger/dagger/2.45/dagger-2.45.jar" />
+          <entry name="$MAVEN_REPOSITORY$/com/google/dagger/dagger-compiler/2.48/dagger-compiler-2.48.jar" />
+          <entry name="$MAVEN_REPOSITORY$/com/google/dagger/dagger/2.48/dagger-2.48.jar" />
           <entry name="$MAVEN_REPOSITORY$/javax/inject/javax.inject/1/javax.inject-1.jar" />
-          <entry name="$MAVEN_REPOSITORY$/com/google/dagger/dagger-producers/2.45/dagger-producers-2.45.jar" />
+          <entry name="$MAVEN_REPOSITORY$/com/google/dagger/dagger-producers/2.48/dagger-producers-2.48.jar" />
           <entry name="$MAVEN_REPOSITORY$/com/google/guava/failureaccess/1.0.1/failureaccess-1.0.1.jar" />
           <entry name="$MAVEN_REPOSITORY$/com/google/guava/guava/31.0.1-jre/guava-31.0.1-jre.jar" />
           <entry name="$MAVEN_REPOSITORY$/com/google/guava/listenablefuture/9999.0-empty-to-avoid-conflict-with-guava/listenablefuture-9999.0-empty-to-avoid-conflict-with-guava.jar" />
@@ -26,20 +26,19 @@
           <entry name="$MAVEN_REPOSITORY$/com/google/errorprone/error_prone_annotations/2.7.1/error_prone_annotations-2.7.1.jar" />
           <entry name="$MAVEN_REPOSITORY$/com/google/j2objc/j2objc-annotations/1.3/j2objc-annotations-1.3.jar" />
           <entry name="$MAVEN_REPOSITORY$/org/checkerframework/checker-compat-qual/2.5.5/checker-compat-qual-2.5.5.jar" />
-          <entry name="$MAVEN_REPOSITORY$/com/google/dagger/dagger-spi/2.45/dagger-spi-2.45.jar" />
-          <entry name="$MAVEN_REPOSITORY$/com/google/devtools/ksp/symbol-processing-api/1.7.0-1.0.6/symbol-processing-api-1.7.0-1.0.6.jar" />
-          <entry name="$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib/1.7.0/kotlin-stdlib-1.7.0.jar" />
-          <entry name="$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-common/1.7.0/kotlin-stdlib-common-1.7.0.jar" />
+          <entry name="$MAVEN_REPOSITORY$/com/google/dagger/dagger-spi/2.48/dagger-spi-2.48.jar" />
+          <entry name="$MAVEN_REPOSITORY$/com/google/devtools/ksp/symbol-processing-api/1.9.0-1.0.12/symbol-processing-api-1.9.0-1.0.12.jar" />
+          <entry name="$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib/1.9.0/kotlin-stdlib-1.9.0.jar" />
+          <entry name="$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-common/1.9.0/kotlin-stdlib-common-1.9.0.jar" />
           <entry name="$MAVEN_REPOSITORY$/org/jetbrains/annotations/13.0/annotations-13.0.jar" />
           <entry name="$MAVEN_REPOSITORY$/com/squareup/javapoet/1.13.0/javapoet-1.13.0.jar" />
-          <entry name="$MAVEN_REPOSITORY$/com/squareup/kotlinpoet/1.11.0/kotlinpoet-1.11.0.jar" />
-          <entry name="$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk8/1.7.0/kotlin-stdlib-jdk8-1.7.0.jar" />
-          <entry name="$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk7/1.7.0/kotlin-stdlib-jdk7-1.7.0.jar" />
-          <entry name="$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-reflect/1.6.10/kotlin-reflect-1.6.10.jar" />
           <entry name="$MAVEN_REPOSITORY$/com/google/googlejavaformat/google-java-format/1.5/google-java-format-1.5.jar" />
           <entry name="$MAVEN_REPOSITORY$/com/google/errorprone/javac-shaded/9-dev-r4023-3/javac-shaded-9-dev-r4023-3.jar" />
+          <entry name="$MAVEN_REPOSITORY$/com/squareup/kotlinpoet/1.11.0/kotlinpoet-1.11.0.jar" />
+          <entry name="$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk8/1.6.10/kotlin-stdlib-jdk8-1.6.10.jar" />
+          <entry name="$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk7/1.6.10/kotlin-stdlib-jdk7-1.6.10.jar" />
+          <entry name="$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-reflect/1.6.10/kotlin-reflect-1.6.10.jar" />
           <entry name="$MAVEN_REPOSITORY$/net/ltgt/gradle/incap/incap/0.2/incap-0.2.jar" />
-          <entry name="$MAVEN_REPOSITORY$/org/jetbrains/kotlinx/kotlinx-metadata-jvm/0.5.0/kotlinx-metadata-jvm-0.5.0.jar" />
         </processorPath>
         <module name="cryptomator" />
       </profile>
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 891096945..ee700a1c2 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -8,7 +8,7 @@
       </list>
     </option>
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_20_PREVIEW" project-jdk-name="20" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_21_PREVIEW" project-jdk-name="21" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>
\ No newline at end of file
diff --git a/dist/linux/debian/control b/dist/linux/debian/control
index b04812fbb..148fdb213 100644
--- a/dist/linux/debian/control
+++ b/dist/linux/debian/control
@@ -2,7 +2,7 @@ Source: cryptomator
 Maintainer: Cryptobot <releases@cryptomator.org>
 Section: utils
 Priority: optional
-Build-Depends: debhelper (>=10), coffeelibs-jdk-20, libgtk2.0-0, libgtk-3-0,  libxxf86vm1, libgl1
+Build-Depends: debhelper (>=10), coffeelibs-jdk-21, libgtk2.0-0, libgtk-3-0,  libxxf86vm1, libgl1
 Standards-Version: 4.5.0
 Homepage: https://cryptomator.org
 Vcs-Git: https://github.com/cryptomator/cryptomator.git
diff --git a/dist/linux/debian/rules b/dist/linux/debian/rules
index c12879025..d0a12e380 100755
--- a/dist/linux/debian/rules
+++ b/dist/linux/debian/rules
@@ -4,7 +4,7 @@
 # Uncomment this to turn on verbose mode.
 #export DH_VERBOSE=1
 
-JAVA_HOME = /usr/lib/jvm/java-20-coffeelibs
+JAVA_HOME = /usr/lib/jvm/java-21-coffeelibs
 DEB_BUILD_ARCH ?= $(shell dpkg-architecture -qDEB_BUILD_ARCH)
 ifeq ($(DEB_BUILD_ARCH),amd64)
 JMODS_PATH = jmods/amd64:${JAVA_HOME}/jmods
diff --git a/pom.xml b/pom.xml
index 2c6faa90c..d4444149c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -26,7 +26,7 @@
 
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-		<project.jdk.version>20</project.jdk.version>
+		<project.jdk.version>21</project.jdk.version>
 
 		<!-- Group IDs of jars that need to stay on the class path for now -->
 		<!-- remove them, as soon they got modularized or support is dropped (i.e., WebDAV) -->
@@ -37,8 +37,8 @@
 		<cryptomator.integrations.version>1.3.0</cryptomator.integrations.version>
 		<cryptomator.integrations.win.version>1.2.3</cryptomator.integrations.win.version>
 		<cryptomator.integrations.mac.version>1.2.2</cryptomator.integrations.mac.version>
-		<cryptomator.integrations.linux.version>1.3.0</cryptomator.integrations.linux.version>
-		<cryptomator.fuse.version>3.0.0</cryptomator.fuse.version>
+		<cryptomator.integrations.linux.version>1.4.0-beta2</cryptomator.integrations.linux.version>
+		<cryptomator.fuse.version>4.0.0-beta1</cryptomator.fuse.version>
 		<cryptomator.dokany.version>2.0.0</cryptomator.dokany.version>
 		<cryptomator.webdav.version>2.0.4</cryptomator.webdav.version>
 
@@ -64,7 +64,7 @@
 		<!-- build-time dependencies -->
 		<jetbrains.annotations.version>24.0.1</jetbrains.annotations.version>
 		<dependency-check.version>8.4.0</dependency-check.version>
-		<jacoco.version>0.8.10</jacoco.version>
+		<jacoco.version>0.8.11</jacoco.version>
 		<license-generator.version>2.2.0</license-generator.version>
 		<junit-tree-reporter.version>1.2.1</junit-tree-reporter.version>
 		<mvn-compiler.version>3.11.0</mvn-compiler.version>
diff --git a/src/main/java/org/cryptomator/ui/health/StartController.java b/src/main/java/org/cryptomator/ui/health/StartController.java
index 4e95b6b0f..9ff2502da 100644
--- a/src/main/java/org/cryptomator/ui/health/StartController.java
+++ b/src/main/java/org/cryptomator/ui/health/StartController.java
@@ -101,16 +101,16 @@ public class StartController implements FxController {
 		}
 	}
 
-	private void loadingKeyFailed(Throwable e) {
-		switch (e) {
-			case UnlockCancelledException uce -> {} //ok
-			case VaultKeyInvalidException vkie -> {
-				LOG.error("Invalid key"); //TODO: specific error screen
+	private void loadingKeyFailed(Throwable t) {
+		switch (t) {
+			case UnlockCancelledException e -> {} // ok // TODO: rename to _ with JEP 443
+			case VaultKeyInvalidException e -> { // TODO: rename to _ with JEP 443
+				LOG.error("Invalid key"); // TODO: specific error screen
 				appWindows.showErrorWindow(e, window, null);
 			}
 			default -> {
-				LOG.error("Failed to load key.", e);
-				appWindows.showErrorWindow(e, window, null);
+				LOG.error("Failed to load key.", t);
+				appWindows.showErrorWindow(t, window, null);
 			}
 		}
 	}