diff --git a/.gitea/workflows/test-pr.yaml b/.gitea/workflows/test-pr.yaml
index c009102..d7b0d89 100644
--- a/.gitea/workflows/test-pr.yaml
+++ b/.gitea/workflows/test-pr.yaml
@@ -2,7 +2,7 @@ name: Test Pull Request
 on:
   pull_request:
     branches:
-      - 'main'
+      - 'master'
       - 'develop'
 
 env:
diff --git a/Dockerfile b/Dockerfile
index 33d3eec..a49850c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.21
+FROM alpine:3.21.1
 
 RUN apk --no-cache add net-snmp
 ADD mibs.tar.gz /mibs/