diff --git a/lib/citeengines/basic.citeengine b/lib/citeengines/basic.citeengine
index 49b00842d3..5bccaf767e 100644
--- a/lib/citeengines/basic.citeengine
+++ b/lib/citeengines/basic.citeengine
@@ -6,7 +6,7 @@
 
 # Author: Julien Rioux <jrioux@lyx.org>
 
-Format 63
+Format 64
 
 # The framework (biblatex|bibtex)
 CiteFramework bibtex
diff --git a/lib/citeengines/biblatex-natbib.citeengine b/lib/citeengines/biblatex-natbib.citeengine
index 842b05b237..c33ff0e3c6 100644
--- a/lib/citeengines/biblatex-natbib.citeengine
+++ b/lib/citeengines/biblatex-natbib.citeengine
@@ -10,7 +10,7 @@
 
 # Author: Jürgen Spitzmüller <spitz@lyx.org>
 
-Format 63
+Format 64
 
 Requires biblatex
 
diff --git a/lib/citeengines/biblatex.citeengine b/lib/citeengines/biblatex.citeengine
index 2b2edb6291..e6d6db60d2 100644
--- a/lib/citeengines/biblatex.citeengine
+++ b/lib/citeengines/biblatex.citeengine
@@ -8,7 +8,7 @@
 
 # Author: Jürgen Spitzmüller <spitz@lyx.org>
 
-Format 63
+Format 64
 
 Requires biblatex
 
diff --git a/lib/citeengines/jurabib.citeengine b/lib/citeengines/jurabib.citeengine
index 91a4e0bd38..881deeef2a 100644
--- a/lib/citeengines/jurabib.citeengine
+++ b/lib/citeengines/jurabib.citeengine
@@ -7,7 +7,7 @@
 
 # Author: Julien Rioux <jrioux@lyx.org>
 
-Format 63
+Format 64
 
 Requires jurabib
 
diff --git a/lib/citeengines/natbib.citeengine b/lib/citeengines/natbib.citeengine
index 1472706863..ec3628d227 100644
--- a/lib/citeengines/natbib.citeengine
+++ b/lib/citeengines/natbib.citeengine
@@ -8,7 +8,7 @@
 
 # Author: Julien Rioux <jrioux@lyx.org>
 
-Format 63
+Format 64
 
 Requires natbib