diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 5cc11d8..de1917f 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -47,12 +47,12 @@ jobs:
  - job: msrv
    pool:
      vmImage: ubuntu-latest
-   displayName: "Minimum supported Rust version: 1.36.0"
+   displayName: "Minimum supported Rust version: 1.40.0"
    dependsOn: []
    steps:
      - template: install-rust.yml@templates
        parameters:
-         rust: 1.36.0
+         rust: 1.40.0 # static-assertions (1.37+) and base64 (1.40+)
      - script: cargo check
        displayName: cargo check
  - job: integration
@@ -79,11 +79,11 @@ resources:
     - repository: templates
       type: github
       name: crate-ci/azure-pipelines
-      ref: refs/heads/v0.3
+      ref: refs/heads/v0.4
       endpoint: jonhoo
   containers:
    - container: greenmail
-     image: greenmail/standalone:1.5.11
+     image: greenmail/standalone:1.5.13
      ports:
        - 3025:3025
        - 3110:3110