diff --git a/.circleci/config.yml b/.circleci/config.yml
index 95f239110..6c6f6e439 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -47,14 +47,6 @@ workflows:
   client_golang:
     jobs:
       # Refer to README.md for the currently supported versions.
-      - test:
-          name: go-1-13
-          go_version: "1.13"
-          run_lint: true
-      - test:
-          name: go-1-14
-          go_version: "1.14"
-          run_lint: true
       - test:
           name: go-1-15
           go_version: "1.15"
diff --git a/README.md b/README.md
index 41fc1ed3c..6b0e8742b 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ This is the [Go](http://golang.org) client library for
 instrumenting application code, and one for creating clients that talk to the
 Prometheus HTTP API.
 
-__This library requires Go1.13 or later.__
+__This library requires Go1.15 or later.__
 
 ## Important note about releases and stability
 
diff --git a/go.mod b/go.mod
index 40ff4fca3..9088d0820 100644
--- a/go.mod
+++ b/go.mod
@@ -12,4 +12,4 @@ require (
 	google.golang.org/protobuf v1.26.0
 )
 
-go 1.13
+go 1.15