diff --git a/capnproto/build.sh b/capnproto/build.sh
index e3f5152..d4ad21d 100644
--- a/capnproto/build.sh
+++ b/capnproto/build.sh
@@ -4,7 +4,7 @@ set -e
 DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null && pwd)"
 cd "$DIR"
 
-VERSION="1.0.1"
+VERSION="1.4.0"
 INSTALL_DIR="$DIR/capnproto/install"
 
 NJOBS="$(nproc 2>/dev/null || sysctl -n hw.ncpu 2>/dev/null || echo 2)"
diff --git a/capnproto/pyproject.toml b/capnproto/pyproject.toml
index 0e3f4b8..21f8bd4 100644
--- a/capnproto/pyproject.toml
+++ b/capnproto/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "comma-deps-capnproto"
-version = "1.0.1"
+version = "1.4.0"
 description = "Cap'n Proto serialization library and compiler"
 requires-python = ">=3.12"