diff --git a/core/src/main/resources/org/lflang/StringsBundle.properties b/core/src/main/resources/org/lflang/StringsBundle.properties
index b815a26bf8..732ea8b8fb 100644
--- a/core/src/main/resources/org/lflang/StringsBundle.properties
+++ b/core/src/main/resources/org/lflang/StringsBundle.properties
@@ -1 +1 @@
-VERSION = 0.9.0
+VERSION = 0.9.1-SNAPSHOT
diff --git a/gradle.properties b/gradle.properties
index 530886f9f2..b844c48ff6 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,6 +1,6 @@
 [header]
 group=org.lflang
-version=0.9.0
+version=0.9.1-SNAPSHOT
 
 [versions]
 antlrVersion=4.7.2