diff --git a/Dockerfile b/Dockerfile
index f1983dd..4a21e33 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,9 +1,9 @@
-# syntax = docker/dockerfile:1.5
+# syntax = docker/dockerfile:1.10
 ########################################
 
 FROM --platform=${BUILDPLATFORM} golang:1.23.1-alpine3.20 AS builder
 RUN apk update && apk add --no-cache make
-ENV GO111MODULE on
+ENV GO111MODULE=on
 WORKDIR /src
 
 COPY go.mod go.sum /src
diff --git a/Makefile b/Makefile
index 2fcc917..0ee2465 100644
--- a/Makefile
+++ b/Makefile
@@ -21,7 +21,8 @@ TESTARGS ?= "-v"
 
 BUILD_ARGS := --platform=$(PLATFORM)
 ifeq ($(PUSH),true)
-BUILD_ARGS += --push=$(PUSH) --output type=image,annotation-index.org.opencontainers.image.source="https://github.com/$(USERNAME)/$(PROJECT)"
+BUILD_ARGS += --push=$(PUSH)
+BUILD_ARGS += --output type=image,annotation-index.org.opencontainers.image.source="https://github.com/$(USERNAME)/$(PROJECT)",annotation-index.org.opencontainers.image.description="Proxmox VE CCM for Kubernetes"
 else
 BUILD_ARGS += --output type=docker
 endif
diff --git a/pkg/proxmox/instances.go b/pkg/proxmox/instances.go
index 4da6dd9..e828987 100644
--- a/pkg/proxmox/instances.go
+++ b/pkg/proxmox/instances.go
@@ -235,6 +235,10 @@ func (i *instances) getInstanceType(vmRef *pxapi.VmRef, region string) (string,
 		return "", err
 	}
 
+	if vmInfo["maxcpu"] == nil || vmInfo["maxmem"] == nil {
+		return "", fmt.Errorf("instances.getInstanceType() failed to get instance type")
+	}
+
 	return fmt.Sprintf("%.0fVCPU-%.0fGB",
 		vmInfo["maxcpu"].(float64),
 		vmInfo["maxmem"].(float64)/1024/1024/1024), nil