diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1860ef35..09b78454 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,52 @@
 
 All notable changes to this project are documented in this file.
 
+## 1.0.0-rc.4 (2020-04-03) 
+
+This is a release candidate for Flagger v1.0.0.
+
+The upgrade procedure from 0.x to 1.0 can be found [here](https://docs.flagger.app/dev/upgrade-guide).
+
+**Breaking change**: the minimum supported version of Kubernetes is v1.14.0.
+
+#### Features
+
+- Implement NGINX Ingress header regex matching
+    [#546](https://github.com/weaveworks/flagger/pull/546)
+
+#### Improvements
+
+- pkg/router: update ingress API to networking.k8s.io/v1beta1
+    [#534](https://github.com/weaveworks/flagger/pull/534)
+- loadtester: add return cmd output option
+    [#535](https://github.com/weaveworks/flagger/pull/535)
+- refactoring: finalizer error handling and unit testing
+    [#531](https://github.com/weaveworks/flagger/pull/535)
+    [#530](https://github.com/weaveworks/flagger/pull/530)
+- chart: add finalizers to RBAC rules for OpenShift
+    [#537](https://github.com/weaveworks/flagger/pull/537)
+- chart: allow security context to be disabled on OpenShift
+    [#543](https://github.com/weaveworks/flagger/pull/543)
+- chart: add annotations for service account 
+    [#521](https://github.com/weaveworks/flagger/pull/521)
+- docs: Add Prometheus Operator tutorial
+    [#524](https://github.com/weaveworks/flagger/pull/524)
+
+#### Fixes
+
+- pkg/controller: avoid status conflicts on initialization
+    [#544](https://github.com/weaveworks/flagger/pull/544)
+- pkg/canary: fix status retry
+    [#541](https://github.com/weaveworks/flagger/pull/541)
+- loadtester: fix timeout errors
+    [#539](https://github.com/weaveworks/flagger/pull/539)
+- pkg/canary/daemonset: fix readiness check
+    [#529](https://github.com/weaveworks/flagger/pull/529)
+- logs: reduce log verbosity and fix typos
+    [#540](https://github.com/weaveworks/flagger/pull/540)
+    [#526](https://github.com/weaveworks/flagger/pull/526)
+
+
 ## 1.0.0-rc.3 (2020-03-23) 
 
 This is a release candidate for Flagger v1.0.0.
diff --git a/artifacts/flagger/deployment.yaml b/artifacts/flagger/deployment.yaml
index 8e085b23..6b9d50f8 100644
--- a/artifacts/flagger/deployment.yaml
+++ b/artifacts/flagger/deployment.yaml
@@ -22,7 +22,7 @@ spec:
       serviceAccountName: flagger
       containers:
       - name: flagger
-        image: weaveworks/flagger:1.0.0-rc.3
+        image: weaveworks/flagger:1.0.0-rc.4
         imagePullPolicy: IfNotPresent
         ports:
         - name: http
diff --git a/charts/flagger/Chart.yaml b/charts/flagger/Chart.yaml
index 69348240..3fbd7393 100644
--- a/charts/flagger/Chart.yaml
+++ b/charts/flagger/Chart.yaml
@@ -1,7 +1,7 @@
 apiVersion: v1
 name: flagger
-version: 0.26.0
-appVersion: 1.0.0-rc.3
+version: 0.27.0
+appVersion: 1.0.0-rc.4
 kubeVersion: ">=1.11.0-0"
 engine: gotpl
 description: Flagger is a progressive delivery operator for Kubernetes
diff --git a/charts/flagger/README.md b/charts/flagger/README.md
index ab294f51..6ff665ae 100644
--- a/charts/flagger/README.md
+++ b/charts/flagger/README.md
@@ -12,8 +12,7 @@ Flagger can be configured to send alerts to various chat platforms such as Slack
 
 ## Prerequisites
 
-* Kubernetes >= 1.11
-* Prometheus >= 2.6
+* Kubernetes >= 1.14
 
 ## Installing the Chart
 
diff --git a/charts/flagger/templates/prometheus.yaml b/charts/flagger/templates/prometheus.yaml
index 46986a8e..467797c3 100644
--- a/charts/flagger/templates/prometheus.yaml
+++ b/charts/flagger/templates/prometheus.yaml
@@ -230,7 +230,7 @@ spec:
       serviceAccountName: {{ template "flagger.serviceAccountName" . }}-prometheus
       containers:
         - name: prometheus
-          image: "docker.io/prom/prometheus:v2.16.0"
+          image: {{ .Values.prometheus.image }}
           imagePullPolicy: IfNotPresent
           args:
             - '--storage.tsdb.retention=2h'
diff --git a/charts/flagger/values.yaml b/charts/flagger/values.yaml
index c6fcf5e2..9ff73da0 100644
--- a/charts/flagger/values.yaml
+++ b/charts/flagger/values.yaml
@@ -2,7 +2,7 @@
 
 image:
   repository: weaveworks/flagger
-  tag: 1.0.0-rc.3
+  tag: 1.0.0-rc.4
   pullPolicy: IfNotPresent
   pullSecret:
 
@@ -115,6 +115,7 @@ tolerations: []
 prometheus:
   # to be used with ingress controllers
   install: false
+  image: docker.io/prom/prometheus:v2.17.1
 
 #  Istio multi-cluster service mesh (shared control plane single-network)
 # https://istio.io/docs/setup/install/multicluster/shared-vpn/
diff --git a/docs/gitbook/dev/upgrade-guide.md b/docs/gitbook/dev/upgrade-guide.md
index 675e6472..9fb634dc 100644
--- a/docs/gitbook/dev/upgrade-guide.md
+++ b/docs/gitbook/dev/upgrade-guide.md
@@ -12,6 +12,7 @@ Canary CRD changes in `canaries.flagger.app/v1beta1`:
 * the `spec.analysis.metrics[].templateRef` can reference a `metrictemplate.flagger.app/v1beta1` resource
 * the `metric.threshold` field has been deprecated and replaced with `metric.thresholdRange`
 * the `metric.query` field has been deprecated and replaced with `metric.templateRef`
+* the `spec.ingressRef.apiVersion` accepts `networking.k8s.io/v1beta1`
 * the `spec.targetRef` can reference `DaemonSet` kind
 
 Upgrade procedure:
diff --git a/docs/gitbook/install/flagger-install-on-kubernetes.md b/docs/gitbook/install/flagger-install-on-kubernetes.md
index cd954666..fc022a22 100644
--- a/docs/gitbook/install/flagger-install-on-kubernetes.md
+++ b/docs/gitbook/install/flagger-install-on-kubernetes.md
@@ -4,7 +4,7 @@ This guide walks you through setting up Flagger on a Kubernetes cluster with Hel
 
 ## Prerequisites
 
-Flagger requires a Kubernetes cluster **v1.13** or newer.
+Flagger requires a Kubernetes cluster **v1.14** or newer.
 
 ## Install Flagger with Helm
 
diff --git a/kustomize/base/flagger/kustomization.yaml b/kustomize/base/flagger/kustomization.yaml
index 02f56d92..235dee49 100644
--- a/kustomize/base/flagger/kustomization.yaml
+++ b/kustomize/base/flagger/kustomization.yaml
@@ -8,4 +8,4 @@ resources:
   - deployment.yaml
 images:
   - name: weaveworks/flagger
-    newTag: 1.0.0-rc.3
+    newTag: 1.0.0-rc.4
diff --git a/kustomize/base/prometheus/deployment.yaml b/kustomize/base/prometheus/deployment.yaml
index 1541b16b..5b5def41 100644
--- a/kustomize/base/prometheus/deployment.yaml
+++ b/kustomize/base/prometheus/deployment.yaml
@@ -19,7 +19,7 @@ spec:
       serviceAccountName: flagger-prometheus
       containers:
           - name: prometheus
-            image: prom/prometheus:v2.16.0
+            image: prom/prometheus:v2.17.1
             imagePullPolicy: IfNotPresent
             args:
               - '--storage.tsdb.retention=2h'
diff --git a/pkg/version/version.go b/pkg/version/version.go
index 37f098aa..54849115 100644
--- a/pkg/version/version.go
+++ b/pkg/version/version.go
@@ -1,4 +1,4 @@
 package version
 
-var VERSION = "1.0.0-rc.3"
+var VERSION = "1.0.0-rc.4"
 var REVISION = "unknown"