diff --git a/release_version.txt b/release_version.txt
index ad83b1b..dc2b74e 100644
--- a/release_version.txt
+++ b/release_version.txt
@@ -1 +1 @@
-0.5.6
\ No newline at end of file
+0.5.7
\ No newline at end of file
diff --git a/utils/send_mmost.sh b/utils/send_mmost.sh
index 97cc70a..fc52218 100755
--- a/utils/send_mmost.sh
+++ b/utils/send_mmost.sh
@@ -14,7 +14,7 @@ bearer=$(jq -r '.MATTERMOST.bearer' ${HOME}/.creds)
 #lowercase channel
 channel_name=$(echo "${channel_name}" | awk '{print tolower($0)}')
 # space to '-'
-channel_name=${channel_name/" "/"-"}
+channel_name=${channel_name//" "/"-"}
 
 get_channel_url="${url}/api/v4/teams/name/${team}/channels/name/${channel_name}"