diff --git a/README.md b/README.md
index 1ed60695bfb..5f6d5ab3ff0 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,19 @@ the library is tested against Go version 1.22 and greater.  go-github tracks
 older versions of Go if we don't have to, but due to tooling constraints, we
 don't always test older versions.
 
+Go version 1.22 introduced significant changes to the pattern syntax and matching
+behavior of `http.ServerMux` which causes a large number of legacy unit tests to break.
+(See https://pkg.go.dev/net/http#hdr-Compatibility-ServeMux for more information.)
+As a result, testing of this repo is currently performed by setting this env variable:
+
+```bash
+export GODEBUG=httpmuxgo121=1
+```
+
+An issue has been created (#3409) requesting assistance in updating all breaking legacy unit
+tests when this `GODEBUG` environment variable is not set and Go 1.23.4 or later is
+used to perform unit tests.
+
 [support-policy]: https://golang.org/doc/devel/release.html#policy
 
 If you're interested in using the [GraphQL API v4][], the recommended library is
diff --git a/example/go.mod b/example/go.mod
index 7b23a7b88a1..314b6c93ee5 100644
--- a/example/go.mod
+++ b/example/go.mod
@@ -1,8 +1,6 @@
 module github.com/google/go-github/v68/example
 
-go 1.22.5
-
-toolchain go1.23.2
+go 1.22.10
 
 require (
 	github.com/ProtonMail/go-crypto v0.0.0-20230828082145-3c4c8a2d2371
diff --git a/example/newreposecretwithlibsodium/go.mod b/example/newreposecretwithlibsodium/go.mod
index 0314bc03080..281feb1a542 100644
--- a/example/newreposecretwithlibsodium/go.mod
+++ b/example/newreposecretwithlibsodium/go.mod
@@ -1,8 +1,6 @@
 module newreposecretwithlibsodium
 
-go 1.21
-
-toolchain go1.22.0
+go 1.22.10
 
 require (
 	github.com/GoKillers/libsodium-go v0.0.0-20171022220152-dd733721c3cb
diff --git a/go.mod b/go.mod
index e695685f022..6e7d38a639a 100644
--- a/go.mod
+++ b/go.mod
@@ -5,4 +5,4 @@ require (
 	github.com/google/go-querystring v1.1.0
 )
 
-go 1.21
+go 1.22.10
diff --git a/scrape/go.mod b/scrape/go.mod
index ec913e510d3..69c6248ac60 100644
--- a/scrape/go.mod
+++ b/scrape/go.mod
@@ -1,8 +1,6 @@
 module github.com/google/go-github/scrape
 
-go 1.23
-
-toolchain go1.23.4
+go 1.23.4
 
 require (
 	github.com/PuerkitoBio/goquery v1.10.1
diff --git a/script/test.sh b/script/test.sh
index dedd832ecad..6cff1ac6952 100755
--- a/script/test.sh
+++ b/script/test.sh
@@ -7,6 +7,8 @@
 set -e
 
 CDPATH="" cd -- "$(dirname -- "$0")/.."
+# TODO(gmlewis): Remove this when #3409 is resolved.
+export GODEBUG=httpmuxgo121=1
 
 if [ "$#" = "0" ]; then
   set -- -race -covermode atomic ./...
diff --git a/tools/go.mod b/tools/go.mod
index a22dadf4020..f5ca69b70d1 100644
--- a/tools/go.mod
+++ b/tools/go.mod
@@ -1,8 +1,6 @@
 module tools
 
-go 1.21
-
-toolchain go1.22.0
+go 1.23.4
 
 require (
 	github.com/alecthomas/kong v1.6.0