diff --git a/.drone.star b/.drone.star
index 8da71f5..a487361 100644
--- a/.drone.star
+++ b/.drone.star
@@ -87,10 +87,9 @@ def linux(arch):
         'image': 'golang:1.12',
         'environment': {
           'CGO_ENABLED': '0',
-          'BUILD_VERSION': '${DRONE_TAG##v}'
         },
         'commands': [
-          '[ -z "${BUILD_VERSION}" ] && BUILD_VERSION=${DRONE_COMMIT_SHA:0:8}',
+          '[ -z "${DRONE_TAG}" ] && BUILD_VERSION=${DRONE_COMMIT_SHA:0:8} || BUILD_VERSION=${DRONE_TAG##v}',
           'go build -v -ldflags "-X main.Version=$BUILD_VERSION" -a -tags netgo -o release/%s/github-releases-notifier' % arch
         ],
       },
@@ -99,7 +98,6 @@ def linux(arch):
         'image': 'golang:1.12',
         'commands': [
           './release/%s/github-releases-notifier --help' % arch,
-          './release/%s/github-releases-notifier --version' % arch
         ]
       },
       {
@@ -166,11 +164,8 @@ def binaries(arch):
       {
         'name': 'build',
         'image': 'techknowlogick/xgo:latest',
-        'environment': {
-          'BUILD_VERSION': '${DRONE_TAG##v}'
-        },
         'commands': [
-          '[ -z "${BUILD_VERSION}" ] && BUILD_VERSION=${DRONE_COMMIT_SHA:0:8}',
+          '[ -z "${DRONE_TAG}" ] && BUILD_VERSION=${DRONE_COMMIT_SHA:0:8} || BUILD_VERSION=${DRONE_TAG##v}',
           'mkdir -p release/',
           "xgo -ldflags \"-X main.Version=$BUILD_VERSION\" -tags netgo -targets 'linux/amd64,linux/arm-6,linux/arm64' -out github-releases-notifier-$BUILD_VERSION .",
           'cp /build/* release/',
@@ -182,7 +177,6 @@ def binaries(arch):
         'image': 'alpine',
         'commands': [
             'cd release/ && sha256sum * > sha256sum.txt',
-            'cat sha256sum.txt'
         ],
       },
       {
diff --git a/.drone.yml b/.drone.yml
index 642198f..1ac14fc 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -47,17 +47,15 @@ steps:
 - name: build
   image: golang:1.12
   commands:
-  - "[ -z \"${BUILD_VERSION}\" ] && BUILD_VERSION=${DRONE_COMMIT_SHA:0:8}"
+  - "[ -z \"${DRONE_TAG}\" ] && BUILD_VERSION=${DRONE_COMMIT_SHA:0:8} || BUILD_VERSION=${DRONE_TAG##v}"
   - go build -v -ldflags "-X main.Version=$BUILD_VERSION" -a -tags netgo -o release/amd64/github-releases-notifier
   environment:
-    BUILD_VERSION: ${DRONE_TAG##v}
     CGO_ENABLED: 0
 
 - name: executable
   image: golang:1.12
   commands:
   - ./release/amd64/github-releases-notifier --help
-  - ./release/amd64/github-releases-notifier --version
 
 - name: dryrun
   image: plugins/docker
@@ -112,17 +110,15 @@ steps:
 - name: build
   image: golang:1.12
   commands:
-  - "[ -z \"${BUILD_VERSION}\" ] && BUILD_VERSION=${DRONE_COMMIT_SHA:0:8}"
+  - "[ -z \"${DRONE_TAG}\" ] && BUILD_VERSION=${DRONE_COMMIT_SHA:0:8} || BUILD_VERSION=${DRONE_TAG##v}"
   - go build -v -ldflags "-X main.Version=$BUILD_VERSION" -a -tags netgo -o release/arm64/github-releases-notifier
   environment:
-    BUILD_VERSION: ${DRONE_TAG##v}
     CGO_ENABLED: 0
 
 - name: executable
   image: golang:1.12
   commands:
   - ./release/arm64/github-releases-notifier --help
-  - ./release/arm64/github-releases-notifier --version
 
 - name: dryrun
   image: plugins/docker
@@ -177,17 +173,15 @@ steps:
 - name: build
   image: golang:1.12
   commands:
-  - "[ -z \"${BUILD_VERSION}\" ] && BUILD_VERSION=${DRONE_COMMIT_SHA:0:8}"
+  - "[ -z \"${DRONE_TAG}\" ] && BUILD_VERSION=${DRONE_COMMIT_SHA:0:8} || BUILD_VERSION=${DRONE_TAG##v}"
   - go build -v -ldflags "-X main.Version=$BUILD_VERSION" -a -tags netgo -o release/arm/github-releases-notifier
   environment:
-    BUILD_VERSION: ${DRONE_TAG##v}
     CGO_ENABLED: 0
 
 - name: executable
   image: golang:1.12
   commands:
   - ./release/arm/github-releases-notifier --help
-  - ./release/arm/github-releases-notifier --version
 
 - name: dryrun
   image: plugins/docker
@@ -242,19 +236,16 @@ steps:
 - name: build
   image: techknowlogick/xgo:latest
   commands:
-  - "[ -z \"${BUILD_VERSION}\" ] && BUILD_VERSION=${DRONE_COMMIT_SHA:0:8}"
+  - "[ -z \"${DRONE_TAG}\" ] && BUILD_VERSION=${DRONE_COMMIT_SHA:0:8} || BUILD_VERSION=${DRONE_TAG##v}"
   - mkdir -p release/
   - xgo -ldflags "-X main.Version=$BUILD_VERSION" -tags netgo -targets 'linux/amd64,linux/arm-6,linux/arm64' -out github-releases-notifier-$BUILD_VERSION .
   - cp /build/* release/
   - ls -lah release/
-  environment:
-    BUILD_VERSION: ${DRONE_TAG##v}
 
 - name: checksum
   image: alpine
   commands:
   - cd release/ && sha256sum * > sha256sum.txt
-  - cat sha256sum.txt
 
 - name: publish
   image: plugins/github-release
@@ -353,6 +344,6 @@ depends_on:
 
 ---
 kind: signature
-hmac: dfd7579768ef56661e69f51498b32a2cedc72869c01876711963f7f9b8d76fc4
+hmac: db1cd58f6fe402fec379a32614bbda189901ac1b80e92fa20a552bd69eddff20
 
 ...
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3472972..7d2000e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,8 @@
 - FEATURE
   - add env variable `GITHUB_REPOS`
   - add env variable `IGNORE_PRE`
+- BUGFIX
+  - add `required` flag for GitHub token and Slack hook
 - INTERNAL
   - provide also binary releases
   - switch to gomod instead of vendor folder