diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 427822e..707f922 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -48,7 +48,7 @@ jobs:
           password: ${{ secrets.DOCKER_TOKEN }}
 
       - name: Docker Build & Push
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           push: true
           context: .
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 7da15eb..072b8d1 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -17,6 +17,7 @@ jobs:
           - 3.17
           - 3.18
           - 3.19
+          - 3.20
     steps:
       - name: Code Checkout
         uses: actions/checkout@v4
diff --git a/Dockerfile b/Dockerfile
index d1d9149..746b946 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:${ALPINE_VERSION:-3.19}
+FROM alpine:${ALPINE_VERSION:-3.20}
 
 RUN apk add --update --no-cache net-snmp net-snmp-tools envsubst
 
diff --git a/README.md b/README.md
index a634c5c..f108072 100644
--- a/README.md
+++ b/README.md
@@ -31,18 +31,21 @@ Obrigado pelo seu apoio contínuo!
 
 ## Environment Variables
 
-| Variable              | Options         | Default                        |
-|-----------------------|-----------------|--------------------------------|
-| SNMP_COMMUNITY        | --              | public                         |
-| SNMP_LOCATION         | --              | At flying circus               |
-| SNMP_CONTACT          | --              | Testainers <me@testainers.com> |
-| SNMP_SERVICES         | --              | 72                             |
-| SNMP_V3_USER          | --              | --                             |
-| SNMP_V3_USER_TYPE     | rouser - rwuser | rouser                         |
-| SNMP_V3_AUTH_PROTOCOL | MD5 - SHA       | SHA                            |
-| SNMP_V3_AUTH_PWD      | --              | --                             |
-| SNMP_V3_PRIV_PROTOCOL | DES - AES       | AES                            |
-| SNMP_V3_PRIV_PWD      | --              | --                             |
+| Variable              | Options         | Default |
+|-----------------------|-----------------|---------|
+| SNMP_COMMUNITY        | --              | public  |
+| SNMP_LOCATION         | --              | --      |
+| SNMP_CONTACT          | --              | --      |
+| SNMP_SERVICES         | --              | --      |
+| SNMP_V3_USER          | --              | --      |
+| SNMP_V3_USER_TYPE     | rouser - rwuser | rouser  |
+| SNMP_V3_AUTH_PROTOCOL | MD5 - SHA       | SHA     |
+| SNMP_V3_AUTH_PWD      | --              | --      |
+| SNMP_V3_PRIV_PROTOCOL | DES - AES       | AES     |
+| SNMP_V3_PRIV_PWD      | --              | --      |
+
+If `SNMP_LOCATION`, `SNMP_CONTACT` or `SNMP_SERVICES` are not set, they may
+be writable.
 
 ## How to Use
 
@@ -73,7 +76,35 @@ docker build . --no-cache -t snmpd-container
 Run:
 
 ```shell
-docker run -d --rm --name snmpd -p 5161:161/udp snmpd-container
+docker run -d --rm --name snmpd -p 5161:161/udp \
+  -e SNMP_V3_USER_TYPE=rwuser \
+  -e SNMP_V3_USER=testainers \
+  -e SNMP_V3_AUTH_PWD=authpass \
+  -e SNMP_V3_PRIV_PWD=privpass \
+  snmpd-container
+```
+
+Test:
+
+```shell
+snmpwalk -v3 -On -u testainers -l authPriv \
+  -a SHA -A authpass \
+  -x AES -X privpass \
+  localhost:5161 .1.3.6.1.2.1.1
+```
+
+```shell
+snmpset -v3 -u testainers -l authPriv \
+  -a SHA -A authpass \
+  -x AES -X privpass \
+  localhost:5161 .1.3.6.1.2.1.1.4.0 s "admin@testainers.com"
+```
+
+```shell
+snmpget -v3 -u testainers -l authPriv \
+  -a SHA -A authpass \
+  -x AES -X privpass \
+  localhost:5161 .1.3.6.1.2.1.1.4.0
 ```
 
 Access:
diff --git a/entrypoint.sh b/entrypoint.sh
index 784a70b..5a2844b 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -30,15 +30,21 @@ if [ -z "$SNMP_COMMUNITY" ]; then
   export SNMP_COMMUNITY="public"
 fi
 
-if [ -z "$SNMP_LOCATION" ]; then
-  export SNMP_LOCATION="At flying circus"
+if [ -n "$SNMP_LOCATION" ]; then
+  export SNMP_LOCATION="sysLocation $SNMP_LOCATION"
+else
+  export SNMP_LOCATION=""
 fi
 
-if [ -z "$SNMP_CONTACT" ]; then
-  export SNMP_CONTACT="Testainers <me@testainers.com>"
+if [ -n "$SNMP_CONTACT" ]; then
+  export SNMP_CONTACT="sysContact $SNMP_CONTACT"
+else
+  export SNMP_CONTACT=""
 fi
 
-if [ -z "$SNMP_SERVICES" ]; then
+if [ -n "$SNMP_SERVICES" ]; then
+  export SNMP_SERVICES="sysServices $SNMP_SERVICES"
+else
   export SNMP_SERVICES="72"
 fi
 
diff --git a/etc/snmp/snmpd.template.conf b/etc/snmp/snmpd.template.conf
index a4ae023..571eed9 100644
--- a/etc/snmp/snmpd.template.conf
+++ b/etc/snmp/snmpd.template.conf
@@ -77,11 +77,13 @@ rocommunity ${SNMP_COMMUNITY}  default
 
 #  Note that setting these values here, results in the corresponding MIB objects being 'read-only'
 #  See snmpd.conf(5) for more details
-sysLocation    ${SNMP_LOCATION}
-sysContact     ${SNMP_CONTACT}
+# sysLocation
+${SNMP_LOCATION}
+# sysContact
+${SNMP_CONTACT}
                                                  # Application + End-to-End layers
-sysServices    ${SNMP_SERVICES}
-
+# sysServices
+${SNMP_SERVICES}
 
 #
 #  Process Monitoring
diff --git a/test.sh b/test.sh
index b3be96a..73f54e3 100755
--- a/test.sh
+++ b/test.sh
@@ -297,6 +297,8 @@ docker stop -t 1 "$CONTAINER_NAME" >/dev/null 2>&1
 sleep 2
 printf "[OK]\n\n"
 
+# TODO: Write test for SNMP SET!
+
 ##################
 # Removing Image #
 ##################
diff --git a/version.yaml b/version.yaml
index f2b2ffc..b1f07a6 100644
--- a/version.yaml
+++ b/version.yaml
@@ -1 +1 @@
-version: 0.0.3
+version: 0.0.4