diff --git a/.github/workflows/build_docker.yml b/.github/workflows/build_docker.yml
index fad2bf2..90dcd98 100644
--- a/.github/workflows/build_docker.yml
+++ b/.github/workflows/build_docker.yml
@@ -5,7 +5,8 @@ on:
     branches:
       - 'master'
     tags:
-      - '*.*.*'
+      - '[0-9]+.[0-9]+.[0-9]+'
+      - '[0-9]+.[0-9]+.[0-9]+RC[0-9]+'
 
 jobs:
   docker:
diff --git a/.github/workflows/build_snap.yml b/.github/workflows/build_snap.yml
index 5d663fc..525ef27 100644
--- a/.github/workflows/build_snap.yml
+++ b/.github/workflows/build_snap.yml
@@ -5,7 +5,8 @@ on:
     branches:
       - 'master'
     tags:
-      - '*.*.*'
+      - '[0-9]+.[0-9]+.[0-9]+'
+      - '[0-9]+.[0-9]+.[0-9]+RC[0-9]+'
 
 jobs:
   build-and-release:
diff --git a/scripts/release.sh b/scripts/release.sh
index a2a4a1e..f93ef1e 100755
--- a/scripts/release.sh
+++ b/scripts/release.sh
@@ -64,6 +64,12 @@ fi
 
 RC_VERSION="$MAJOR.$MINOR.$PATCH-RC$RC"
 
+if [ git tag "$RC_VERSION" | grep -q "$RC_VERSION" ]
+then
+    echo "Oups! The tag $RC_VERSION already exists! Please remove it!"
+    exit 0
+fi
+
 MESSAGE="Version $RC_VERSION $(date +'%Y-%m-%d')"
 
 echo