diff --git a/lectures/Dockerfile b/lectures/Dockerfile
index 1c27227..26c7e57 100644
--- a/lectures/Dockerfile
+++ b/lectures/Dockerfile
@@ -1,9 +1,9 @@
-FROM golang:1.13
+FROM golang:1.20-alpine
 
-RUN CGO_ENABLED=0 go get golang.org/x/tools/cmd/present && go install golang.org/x/tools/cmd/present
+RUN CGO_ENABLED=0 go install golang.org/x/tools/cmd/present@latest
 
 COPY . /lectures
 
 WORKDIR /lectures
 
-ENTRYPOINT /go/bin/present -http ':3999' -orighost p.go.manytask.org -use_playground -play=0
+ENTRYPOINT ["/go/bin/present", "-base", "/go/pkg/mod/golang.org/x/tools@v0.6.0/cmd/present", "-http", ":3999", "-orighost", "p.go.manytask.org", "-use_playground", "-play=0"]