diff --git a/instrumentation/github.com/bradfitz/gomemcache/memcache/otelmemcache/example/Dockerfile b/instrumentation/github.com/bradfitz/gomemcache/memcache/otelmemcache/example/Dockerfile
index 89e06637b41..b8456c62bc0 100644
--- a/instrumentation/github.com/bradfitz/gomemcache/memcache/otelmemcache/example/Dockerfile
+++ b/instrumentation/github.com/bradfitz/gomemcache/memcache/otelmemcache/example/Dockerfile
@@ -11,7 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-FROM golang:1.20-alpine AS base
+FROM golang:1.21-alpine AS base
 COPY . /src/
 WORKDIR /src/instrumentation/github.com/bradfitz/gomemcache/memcache/otelmemcache/example