diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index aa5ab3c..5d6584a 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -7,7 +7,7 @@ jobs:
   build:
     strategy:
       matrix:
-        go-version: [1.13.x]
+        go-version: [1.15.x]
         platform: [ubuntu-latest]
     runs-on: ${{ matrix.platform }}
     steps:
diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index a177814..b5b9152 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -4,7 +4,7 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: [1.13.x]
+        go-version: [1.15.x]
         platform: [ubuntu-latest]
     runs-on: ${{ matrix.platform }}
     steps:
diff --git a/Dockerfile b/Dockerfile
index 807144e..a17879d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # This stage builds the go executable.
-FROM golang:1.13-buster as go
+FROM golang:1.15-buster as go
 
 WORKDIR /root
 COPY ./ ./
diff --git a/go.mod b/go.mod
index 902a778..1088cf4 100644
--- a/go.mod
+++ b/go.mod
@@ -1,5 +1,5 @@
 module github.com/tomwright/mermaid-server
 
-go 1.13
+go 1.15
 
 require github.com/tomwright/lifetime v1.0.0