diff --git a/main/core/pom.xml b/main/core/pom.xml
index dad08e639..40febc2a4 100644
--- a/main/core/pom.xml
+++ b/main/core/pom.xml
@@ -12,7 +12,7 @@
 	<parent>
 		<groupId>org.cryptomator</groupId>
 		<artifactId>main</artifactId>
-		<version>0.8.1</version>
+		<version>0.9.0-SNAPSHOT</version>
 	</parent>
 	<artifactId>core</artifactId>
 	<name>Cryptomator WebDAV and I/O module</name>
diff --git a/main/crypto-aes/pom.xml b/main/crypto-aes/pom.xml
index 226c6a870..09d0dbbf5 100644
--- a/main/crypto-aes/pom.xml
+++ b/main/crypto-aes/pom.xml
@@ -12,7 +12,7 @@
 	<parent>
 		<groupId>org.cryptomator</groupId>
 		<artifactId>main</artifactId>
-		<version>0.8.1</version>
+		<version>0.9.0-SNAPSHOT</version>
 	</parent>
 	<artifactId>crypto-aes</artifactId>
 	<name>Cryptomator cryptographic module (AES)</name>
diff --git a/main/crypto-api/pom.xml b/main/crypto-api/pom.xml
index 2e8ff7f2c..138041a44 100644
--- a/main/crypto-api/pom.xml
+++ b/main/crypto-api/pom.xml
@@ -12,7 +12,7 @@
 	<parent>
 		<groupId>org.cryptomator</groupId>
 		<artifactId>main</artifactId>
-		<version>0.8.1</version>
+		<version>0.9.0-SNAPSHOT</version>
 	</parent>
 	<artifactId>crypto-api</artifactId>
 	<name>Cryptomator cryptographic module API</name>
diff --git a/main/installer-debian/pom.xml b/main/installer-debian/pom.xml
index e378ad8bf..9058378f1 100644
--- a/main/installer-debian/pom.xml
+++ b/main/installer-debian/pom.xml
@@ -3,7 +3,7 @@
 	<parent>
 		<groupId>org.cryptomator</groupId>
 		<artifactId>main</artifactId>
-		<version>0.8.1</version>
+		<version>0.9.0-SNAPSHOT</version>
 	</parent>
 	<artifactId>installer-debian</artifactId>
 	<packaging>pom</packaging>
diff --git a/main/installer-osx/pom.xml b/main/installer-osx/pom.xml
index 63e6f75f6..17b287e11 100644
--- a/main/installer-osx/pom.xml
+++ b/main/installer-osx/pom.xml
@@ -3,7 +3,7 @@
 	<parent>
 		<groupId>org.cryptomator</groupId>
 		<artifactId>main</artifactId>
-		<version>0.8.1</version>
+		<version>0.9.0-SNAPSHOT</version>
 	</parent>
 	<artifactId>installer-osx</artifactId>
 	<packaging>pom</packaging>
diff --git a/main/installer-win-portable/pom.xml b/main/installer-win-portable/pom.xml
index d3348e6e8..258f9c4a6 100644
--- a/main/installer-win-portable/pom.xml
+++ b/main/installer-win-portable/pom.xml
@@ -3,7 +3,7 @@
 	<parent>
 		<groupId>org.cryptomator</groupId>
 		<artifactId>main</artifactId>
-		<version>0.8.1</version>
+		<version>0.9.0-SNAPSHOT</version>
 	</parent>
 	<artifactId>installer-win-portable</artifactId>
 	<packaging>pom</packaging>
diff --git a/main/installer-win/pom.xml b/main/installer-win/pom.xml
index 088d958e2..20e6306fa 100644
--- a/main/installer-win/pom.xml
+++ b/main/installer-win/pom.xml
@@ -3,7 +3,7 @@
 	<parent>
 		<groupId>org.cryptomator</groupId>
 		<artifactId>main</artifactId>
-		<version>0.8.1</version>
+		<version>0.9.0-SNAPSHOT</version>
 	</parent>
 	<artifactId>installer-win</artifactId>
 	<packaging>pom</packaging>
diff --git a/main/pom.xml b/main/pom.xml
index 7e74c8358..fe32fde51 100644
--- a/main/pom.xml
+++ b/main/pom.xml
@@ -11,7 +11,7 @@
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>org.cryptomator</groupId>
 	<artifactId>main</artifactId>
-	<version>0.8.1</version>
+	<version>0.9.0-SNAPSHOT</version>
 	<packaging>pom</packaging>
 	<name>Cryptomator</name>
 
diff --git a/main/uber-jar/pom.xml b/main/uber-jar/pom.xml
index aab7166d5..0eb11a843 100644
--- a/main/uber-jar/pom.xml
+++ b/main/uber-jar/pom.xml
@@ -12,7 +12,7 @@
 	<parent>
 		<groupId>org.cryptomator</groupId>
 		<artifactId>main</artifactId>
-		<version>0.8.1</version>
+		<version>0.9.0-SNAPSHOT</version>
 	</parent>
 	<artifactId>uber-jar</artifactId>
 	<packaging>pom</packaging>
diff --git a/main/ui/pom.xml b/main/ui/pom.xml
index dba84dd44..f1c0c0a0b 100644
--- a/main/ui/pom.xml
+++ b/main/ui/pom.xml
@@ -12,7 +12,7 @@
 	<parent>
 		<groupId>org.cryptomator</groupId>
 		<artifactId>main</artifactId>
-		<version>0.8.1</version>
+		<version>0.9.0-SNAPSHOT</version>
 	</parent>
 	<artifactId>ui</artifactId>
 	<name>Cryptomator GUI</name>
diff --git a/main/ui/src/main/java/org/cryptomator/ui/controllers/UnlockController.java b/main/ui/src/main/java/org/cryptomator/ui/controllers/UnlockController.java
index 1a35982dd..bc3f991c1 100644
--- a/main/ui/src/main/java/org/cryptomator/ui/controllers/UnlockController.java
+++ b/main/ui/src/main/java/org/cryptomator/ui/controllers/UnlockController.java
@@ -131,7 +131,7 @@ public class UnlockController implements Initializable {
 			// at this point we know for sure, that the masterkey can be decrypted, so lets make a backup:
 			Files.copy(masterKeyPath, masterKeyBackupPath, StandardCopyOption.REPLACE_EXISTING);
 			vault.setUnlocked(true);
-			final Future<Boolean> futureMount = exec.submit(() -> vault.mount());
+			final Future<Boolean> futureMount = exec.submit(() -> (boolean) vault.mount());
 			FXThreads.runOnMainThreadWhenFinished(exec, futureMount, this::unlockAndMountFinished);
 		} catch (IOException ex) {
 			setControlsDisabled(false);