diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index a64051798..96af8f299 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -16,10 +16,10 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
 
-      - name: Set up Go 1.14
+      - name: Set up Go 1.15
         uses: actions/setup-go@v1
         with:
-          go-version: 1.14
+          go-version: 1.15
         id: go
 
       - name: Check out code into the Go module directory
diff --git a/README.md b/README.md
index 7eca40b68..58fedf1f9 100644
--- a/README.md
+++ b/README.md
@@ -51,7 +51,7 @@ The requirements for this project are:
 
 At build-time, the following software is required:
 
- * `go >= 1.14`
+ * `go >= 1.15`
  * `python-docutils >= 0.13`
 
 ### Build
diff --git a/go.mod b/go.mod
index 8f2aa412f..efa80f426 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/osbuild/osbuild-composer
 
-go 1.14
+go 1.15
 
 require (
 	cloud.google.com/go v0.75.0
diff --git a/tools/prepare-source.sh b/tools/prepare-source.sh
index 547c91891..ea89a520b 100755
--- a/tools/prepare-source.sh
+++ b/tools/prepare-source.sh
@@ -2,7 +2,7 @@
 
 set -eux
 
-GO_VERSION=1.14.14
+GO_VERSION=1.15.13
 GO_BINARY=$(go env GOPATH)/bin/go$GO_VERSION
 
 # this is the official way to get a different version of golang