diff --git a/VERSION b/VERSION
index e395c9270cf14da055f641dbad906e581e6d33c7..75406b357e63ac8a75af96a85beda84fd972cd82 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-25.0+dev
+26.0~beta
diff --git a/VERSION_CODENAME b/VERSION_CODENAME
index 9ba1055d8bf0a42bbd1c3da682036d8a91c1fb92..c9098b37e740d4c28384b3bee6358d2276ca8797 100644
--- a/VERSION_CODENAME
+++ b/VERSION_CODENAME
@@ -1 +1 @@
-Manganese
+Iron
diff --git a/opam b/opam
index 22b65a3d5d1f2effd903dc7629fd04c4251b85d6..a973c9259ecc88a017f2df53b6f890df1a538487 100644
--- a/opam
+++ b/opam
@@ -1,7 +1,7 @@
 opam-version: "2.0"
 name: "frama-c"
 synopsis: "Platform dedicated to the analysis of source code written in C"
-version: "25.0+dev"
+version: "26.0~beta"
 description:"""
 Frama-C gathers several analysis techniques in a single collaborative
 framework, based on analyzers (called "plug-ins") that can build upon the
@@ -68,7 +68,7 @@ authors: [
 homepage: "https://frama-c.com/"
 license: "LGPL-2.1-only"
 dev-repo: "git+https://git.frama-c.com/pub/frama-c.git"
-doc: "http://frama-c.com/download/user-manual-25.0-Manganese.pdf"
+doc: "http://frama-c.com/download/user-manual-26.0-beta-Iron.pdf"
 bug-reports: "https://git.frama-c.com/pub/frama-c/issues"
 tags: [
   "deductive"