diff --git a/CHANGELOG.md b/CHANGELOG.md
index 669aa20..06553f6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,4 @@
-## 4.x
+## 4.6
 * New input variable `<function_name>_SEVERITY` for the `check.sh` script [(issue #30)](https://github.com/Trivadis/pgoperate/issues/30)
 * Bug fix related to the installer that custom_check.lib is not overwritten anymore [(issue #29)](https://github.com/Trivadis/pgoperate/issues/29)
 
diff --git a/bin/VERSION b/bin/VERSION
index 4caecc7..b3d791d 100644
--- a/bin/VERSION
+++ b/bin/VERSION
@@ -1 +1 @@
-4.5
+4.6
diff --git a/bin/install_pgoperate.sh b/bin/install_pgoperate.sh
index 573d780..932abb4 100755
--- a/bin/install_pgoperate.sh
+++ b/bin/install_pgoperate.sh
@@ -15,7 +15,7 @@
 # limitations under the License.
 #
 # Author:  Aychin Gasimov (AYG)
-# Desc: Script to install pgBasEnv from scratch or upgrade existing version.
+# Desc: Script to install pgOperate from scratch or upgrade existing version.
 #       Check README.md for details.
 #
 # Change log:
@@ -72,7 +72,9 @@ mkdir -p $TVDBASE/pgoperate
 [[ $? -gt 0 ]] && echo "ERROR: Cannot continue! Check the path specified." && exit 1 || echo "SUCCESS"
 
 echo -e "\n>>> INSTALLATION STEP: Extracting files into $TVDBASE/pgoperate.\n"
-tar -xvf $TARFILE -C $TVDBASE
+# Do not overwrite the custom_check.lib in case of an existing installation (upgrade case)
+test -f $PGOPERATE_BASE/lib/custom_check.lib && export EXCLUDELIB="--exclude=pgoperate/lib/custom_check.lib"
+tar -xvf $TARFILE -C $TVDBASE $EXCLUDELIB
 [[ $? -gt 0 ]] && echo "ERROR: Cannot continue! Check the output and fix issue." && exit 1 || echo "SUCCESS"
 
 echo -e "\n>>> INSTALLATION STEP: Add aliases to \$PGBASENV_BASE/etc/pgbasenv_standard.conf.\n"
diff --git a/bundle/pgoperate-4.5.tar b/bundle/pgoperate-4.6.tar
similarity index 93%
rename from bundle/pgoperate-4.5.tar
rename to bundle/pgoperate-4.6.tar
index 4e2ce71..c5170c9 100644
Binary files a/bundle/pgoperate-4.5.tar and b/bundle/pgoperate-4.6.tar differ