diff --git a/README.md b/README.md
index 51926b93..acb040c9 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@
 [travis]: https://travis-ci.org/mcu-tools/mcuboot
 [license]: https://github.com/mcu-tools/mcuboot/blob/main/LICENSE
 
-This is MCUboot version 1.10.0-dev
+This is MCUboot version 1.10.0-rc1
 
 MCUboot is a secure bootloader for 32-bits microcontrollers. It defines a
 common infrastructure for the bootloader and the system flash layout on
diff --git a/scripts/imgtool/__init__.py b/scripts/imgtool/__init__.py
index a7f59785..0bbcce2b 100644
--- a/scripts/imgtool/__init__.py
+++ b/scripts/imgtool/__init__.py
@@ -14,4 +14,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-imgtool_version = "1.9.0"
+imgtool_version = "1.10.0rc1"