diff --git a/docs/day3/matplotlib/README.md b/docs/day3/matplotlib/README.md
index eadb20a5e..0fc1cdb5e 100644
--- a/docs/day3/matplotlib/README.md
+++ b/docs/day3/matplotlib/README.md
@@ -111,11 +111,11 @@ Tetralith  |[`matplotlib` documentation](https://www.nsc.liu.se/software/catalog
 HPC cluster|How to load Matplotlib
 -----------|-------------------------------------------------------------------------------------------------------------------
 Alvis      |`module load matplotlib/3.9.2-gfbf-2024a` <!-- TODO -->
-COSMOS     |`module load matplotlib/3.8.2` (avoid version `3.9.2`!) <!-- TODO -->
+COSMOS     |`module load matplotlib/3.8.2` (avoid version `3.9.2`!) <!-- :-) 2026-04-17 -->
 Dardel     |`module load PDC/23.12 cray-python/3.11.5 matplotlib/3.8.2-cpeGNU-23.12` <!-- TODO -->
 Kebnekaise |`module load matplotlib/3.8.2` <!-- TODO -->
-Pelle      |`module load matplotlib/3.9.2-gfbf-2024a` <!-- :-) 2026-05-17 -->
-Tetralith  |`module load Python/3.10.4-env-hpc1-gcc-2022a-eb` <!-- :-) 2026-05-17 -->
+Pelle      |`module load matplotlib/3.9.2-gfbf-2024a` <!-- :-) 2026-04-17 -->
+Tetralith  |`module load Python/3.10.4-env-hpc1-gcc-2022a-eb` <!-- :-) 2026-04-17 -->
 
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