diff --git a/2023/2023-03-16-ProgrammingWithJulia-4/slides/4a-scipkgs.md b/2023/2023-03-16_ProgrammingWithJulia-4/slides/4a-scipkgs.md
similarity index 100%
rename from 2023/2023-03-16-ProgrammingWithJulia-4/slides/4a-scipkgs.md
rename to 2023/2023-03-16_ProgrammingWithJulia-4/slides/4a-scipkgs.md
diff --git a/2023/2023-03-16-ProgrammingWithJulia-4/slides/img/favicon.ico b/2023/2023-03-16_ProgrammingWithJulia-4/slides/img/favicon.ico
similarity index 100%
rename from 2023/2023-03-16-ProgrammingWithJulia-4/slides/img/favicon.ico
rename to 2023/2023-03-16_ProgrammingWithJulia-4/slides/img/favicon.ico
diff --git a/2023/2023-03-16-ProgrammingWithJulia-4/slides/img/julia.svg b/2023/2023-03-16_ProgrammingWithJulia-4/slides/img/julia.svg
similarity index 100%
rename from 2023/2023-03-16-ProgrammingWithJulia-4/slides/img/julia.svg
rename to 2023/2023-03-16_ProgrammingWithJulia-4/slides/img/julia.svg
diff --git a/2023/2023-03-16-ProgrammingWithJulia-4/slides/index.md b/2023/2023-03-16_ProgrammingWithJulia-4/slides/index.md
similarity index 100%
rename from 2023/2023-03-16-ProgrammingWithJulia-4/slides/index.md
rename to 2023/2023-03-16_ProgrammingWithJulia-4/slides/index.md
diff --git a/2023/2023-03-16-ProgrammingWithJulia-4/slides/list.json b/2023/2023-03-16_ProgrammingWithJulia-4/slides/list.json
similarity index 100%
rename from 2023/2023-03-16-ProgrammingWithJulia-4/slides/list.json
rename to 2023/2023-03-16_ProgrammingWithJulia-4/slides/list.json