diff --git a/ALL_VERSIONS b/ALL_VERSIONS
index db1d06dcb452781e69835717d02407024fad37da..8a8ff94767995424b50f31dcd026971ae48a1dd3 100644
--- a/ALL_VERSIONS
+++ b/ALL_VERSIONS
@@ -1,5 +1,6 @@
 Version number			Date of release		Notes
 ==============			===============		=====
+27.1 (Cobalt)                   2023, July, 18
 27.0 (Cobalt)                   2023, June, 15
 26.1 (Iron)                     2023, February 15
 26.0 (Iron)                     2022, November 23
diff --git a/Changelog b/Changelog
index 3ba4625293da9cd670e501cda64062693141349a..c36ddded8499c474455030207e7d2a87ccbde633 100644
--- a/Changelog
+++ b/Changelog
@@ -18,6 +18,10 @@
 Open Source Release <next-release>
 ###############################################################################
 
+###############################################################################
+Open Source Release 27.1 (Cobalt)
+###############################################################################
+
 -   Kernel    [2023-07-17] New frama-c-script wrapper for make_machdep.py
 -*  Ivette    [2023-07-06] Fixes crash with multiple instances
 -*  GUI       [2023-07-05] Fixes freeze when a plugin aborts during splash screen
diff --git a/VERSION b/VERSION
index a0d6856dbeecfde64269587cdef95a06b5edc878..6ef5383e9455d7acc6d65181a442f7d850649579 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-27.0
+27.1
diff --git a/opam b/opam
index 7ea652e166d0055483e4878b6a233f8bb17eb773..fda42254cb75d6f108061628f78cb83c3bb8d6da 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: "27.0"
+version: "27.1"
 description:"""
 Frama-C gathers several analysis techniques in a single collaborative
 framework, based on analyzers (called "plug-ins") that can build upon the
@@ -70,7 +70,7 @@ 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-27.0-Cobalt.pdf"
+doc: "http://frama-c.com/download/user-manual-27.1-Cobalt.pdf"
 bug-reports: "https://git.frama-c.com/pub/frama-c/issues"
 tags: [
   "deductive"
diff --git a/releases/27.1.md b/releases/27.1.md
new file mode 100644
index 0000000000000000000000000000000000000000..7c02e8a360357bbe63be5d2dd00dbee11ef1a4c1
--- /dev/null
+++ b/releases/27.1.md
@@ -0,0 +1,6 @@
+# Kernel
+- Fixes a crash and a freeze in the GTK GUI
+- Add a wrapper in `frama-c-script` pour `make_machdep.py`
+
+# Ivette
+- Fixes a crash with multiple instances of Ivette
diff --git a/src/plugins/e-acsl/doc/Changelog b/src/plugins/e-acsl/doc/Changelog
index 8d365c6d4a829724b44bdaac91bb6c491d01fb05..d0829960b6f98351aafa8264a28f34ae5934c948 100644
--- a/src/plugins/e-acsl/doc/Changelog
+++ b/src/plugins/e-acsl/doc/Changelog
@@ -25,6 +25,10 @@
 Plugin E-ACSL <next-release>
 ###############################################################################
 
+###############################################################################
+Plugin E-ACSL 27.1 (Cobalt)
+###############################################################################
+
 ###############################################################################
 Plugin E-ACSL 27.0 (Cobalt)
 ###############################################################################
diff --git a/src/plugins/wp/Changelog b/src/plugins/wp/Changelog
index 4fb5af2f6901fc18e72acc7545e565964c757d3c..0b74e89cf93d562c70a0ad57e9d39e9f32379242 100644
--- a/src/plugins/wp/Changelog
+++ b/src/plugins/wp/Changelog
@@ -24,6 +24,10 @@
 Plugin WP <next-release>
 ###############################################################################
 
+###############################################################################
+Plugin WP 27.1 (Cobalt)
+###############################################################################
+
 ###############################################################################
 Plugin WP 27.0 (Cobalt)
 ###############################################################################
diff --git a/tools/hdrck/frama-c-hdrck.opam b/tools/hdrck/frama-c-hdrck.opam
index dd69570d265c8fbc7e91ec0fea908d7ff800b22b..de71472f1699552054539b4e511952235da26599 100644
--- a/tools/hdrck/frama-c-hdrck.opam
+++ b/tools/hdrck/frama-c-hdrck.opam
@@ -1,7 +1,7 @@
 opam-version: "2.0"
 name: "frama-c-hdrck"
 synopsis: "Frama-C header check tool"
-version: "27.0"
+version: "27.1"
 description:"""
 Performs all checks related to file headers as required by the Frama-C
 continuous integration.
diff --git a/tools/lint/frama-c-lint.opam b/tools/lint/frama-c-lint.opam
index 821b7196af4c5da5a376c6f802c7decf85a1c34a..ab780f526f88f75330415816dc9e4dcc8322edb7 100644
--- a/tools/lint/frama-c-lint.opam
+++ b/tools/lint/frama-c-lint.opam
@@ -1,7 +1,7 @@
 opam-version: "2.0"
 name: "frama-c-lint"
 synopsis: "Frama-C lint tool"
-version: "27.0"
+version: "27.1"
 description:"""
 Performs all checks related to source code formatting as required by the Frama-C
 continuous integration. Namely: OCP-indent for ML files, clang-format for E-ACSL