diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index eaebb5be..63683774 100644
--- a/.devcontainer/Dockerfile
+++ b/.devcontainer/Dockerfile
@@ -6,7 +6,7 @@
 # When we update the base image version (which we do manually, prompted by Dependabot
 # notifying us of a new Go version), make sure our new base images is listed at:
 # https://hub.docker.com/_/golang
-FROM golang:1.21.1-bullseye
+FROM golang:1.21.3-bullseye
 
 # This Dockerfile adds a non-root user with sudo access. Use the "remoteUser"
 # property in devcontainer.json to use it. On Linux, the container user's GID/UIDs
diff --git a/.github/workflows/dependabot_hack.yml b/.github/workflows/dependabot_hack.yml
index 9d2fa8f6..ff35e417 100644
--- a/.github/workflows/dependabot_hack.yml
+++ b/.github/workflows/dependabot_hack.yml
@@ -20,7 +20,7 @@ jobs:
       # 4. integration_test.yml
       # 5. virtual_test.yml
       # 6. the go.mod (if it is a major or minor version change e.g. 1.14 to 1.15)
-      - uses: golang/go@go1.21.1
+      - uses: golang/go@go1.21.3
 
       # update the versions in the devcontainer Dockerfile manually, too
       - uses: golang/tools@gopls/v0
diff --git a/.github/workflows/github_tag_and_release.yml b/.github/workflows/github_tag_and_release.yml
index a39de165..0c8a58c9 100644
--- a/.github/workflows/github_tag_and_release.yml
+++ b/.github/workflows/github_tag_and_release.yml
@@ -37,7 +37,7 @@ jobs:
         name: Set up Go
         uses: actions/setup-go@v4
         with:
-          go-version: '1.21.1'
+          go-version: '1.21.3'
       -
         name: Run GoReleaser
         uses: goreleaser/goreleaser-action@v5.0.0
diff --git a/.github/workflows/integration_test.yml b/.github/workflows/integration_test.yml
index 9de508f6..9b953750 100644
--- a/.github/workflows/integration_test.yml
+++ b/.github/workflows/integration_test.yml
@@ -16,7 +16,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v4
         with:
-          go-version: '1.21.1'
+          go-version: '1.21.3'
       - name: Checkout code
         uses: actions/checkout@v4
       - name: Tests
diff --git a/.github/workflows/virtual_test.yml b/.github/workflows/virtual_test.yml
index ea9f2d1d..aede70fc 100644
--- a/.github/workflows/virtual_test.yml
+++ b/.github/workflows/virtual_test.yml
@@ -19,7 +19,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v4
         with:
-          go-version: '1.21.1'
+          go-version: '1.21.3'
       - name: Checkout code
         uses: actions/checkout@v4
       - name: Install Hoverfly
diff --git a/Dockerfile b/Dockerfile
index 3485267e..a8f520ba 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM golang:1.21.1-bullseye AS builder
+FROM golang:1.21.3-bullseye AS builder
 
 WORKDIR /src
 COPY . .