diff --git a/build_pico_openpgp.sh b/build_pico_openpgp.sh
index 46ea1b6..d930980 100755
--- a/build_pico_openpgp.sh
+++ b/build_pico_openpgp.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 
-VERSION_MAJOR="3"
-VERSION_MINOR="6"
+VERSION_MAJOR="4"
+VERSION_MINOR="0"
 NO_EDDSA=0
 SUFFIX="${VERSION_MAJOR}.${VERSION_MINOR}"
 #if ! [[ -z "${GITHUB_SHA}" ]]; then
diff --git a/src/openpgp/version.h b/src/openpgp/version.h
index ad47a61..dfbdd33 100644
--- a/src/openpgp/version.h
+++ b/src/openpgp/version.h
@@ -29,7 +29,7 @@
 #define PIV_VERSION_MINOR (PIV_VERSION & 0xff)
 
 
-#define PIPGP_VERSION 0x0306
+#define PIPGP_VERSION 0x0400
 
 #define PIPGP_VERSION_MAJOR ((PIPGP_VERSION >> 8) & 0xff)
 #define PIPGP_VERSION_MINOR (PIPGP_VERSION & 0xff)