diff --git a/HYDRA_VERSION b/HYDRA_VERSION
index 3e99afea2..746def012 100644
--- a/HYDRA_VERSION
+++ b/HYDRA_VERSION
@@ -1 +1 @@
-10.3.4
+10.4.0.rc1
diff --git a/hydra-core/lib/hydra-head/version.rb b/hydra-core/lib/hydra-head/version.rb
index ea46110a7..c6d0f8717 100644
--- a/hydra-core/lib/hydra-head/version.rb
+++ b/hydra-core/lib/hydra-head/version.rb
@@ -1,3 +1,3 @@
 module HydraHead
-  VERSION = "10.3.4"
+  VERSION = "10.4.0.rc1"
 end