diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 41689d51424..3ac481d4f6c 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1 +1 @@
-{".":"0.8.0"}
+{".":"0.8.0","klt-cert-manager":"1.0.0"}
diff --git a/klt-cert-manager/CHANGELOG.md b/klt-cert-manager/CHANGELOG.md
new file mode 100644
index 00000000000..f2c2771290a
--- /dev/null
+++ b/klt-cert-manager/CHANGELOG.md
@@ -0,0 +1,14 @@
+# Changelog
+
+## 1.0.0 (2023-07-03)
+
+
+### Features
+
+* cert-manager monorepo setup ([#1528](https://github.com/keptn/lifecycle-toolkit/issues/1528)) ([0156f15](https://github.com/keptn/lifecycle-toolkit/commit/0156f15779f0ec756c801b51a84c3e9cdd0edeb7))
+
+
+### Dependency Updates
+
+* update dependency kubernetes-sigs/kustomize to v5.1.0 ([#1655](https://github.com/keptn/lifecycle-toolkit/issues/1655)) ([791e211](https://github.com/keptn/lifecycle-toolkit/commit/791e211d515e7eb74d8d347420500323b1cc7cef))
+* update kubernetes packages (patch) ([#1634](https://github.com/keptn/lifecycle-toolkit/issues/1634)) ([4ad9bbf](https://github.com/keptn/lifecycle-toolkit/commit/4ad9bbf74960f6d744d97e43b0e4e6130892ab36))
diff --git a/klt-cert-manager/Makefile b/klt-cert-manager/Makefile
index 7479de87bbe..9a6d41fbe64 100644
--- a/klt-cert-manager/Makefile
+++ b/klt-cert-manager/Makefile
@@ -6,7 +6,7 @@ RELEASE_REGISTRY?=ghcr.io/keptn
 RELEASE_TIME=$(shell date +%Y%m%d%s)
 BUILD_TIME=$(shell date -u "+%F_%T")
 RELEASE_VERSION?=$(RELEASE_TIME)-v0.24.3#$(shell git describe --tags --match "v*")
-TAG?="v0.8.0" # x-release-please-version
+TAG?="v1.0.0" # x-release-please-version
 RELEASE_IMAGE:=certificate-operator:$(TAG)
 CHART_APPVERSION?=""
 
@@ -118,7 +118,7 @@ ENVTEST ?= $(LOCALBIN)/setup-envtest
 ## Tool Versions
 
 # renovate: datasource=github-tags depName=kubernetes-sigs/kustomize
-KUSTOMIZE_VERSION?=v5.1.0
+KUSTOMIZE_VERSION?=v5.0.3
 # renovate: datasource=github-releases depName=kubernetes-sigs/controller-tools
 CONTROLLER_TOOLS_VERSION?=v0.12.0