diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f801ecc92..8c0964a1a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -44,7 +44,7 @@ jobs:
           - 5432:5432
     steps:
       - name: Install system dependencies
-        run: sudo apt-get install -y build-essential curl git gsfonts imagemagick libcurl4-openssl-dev libidn11-dev libmagickwand-dev libssl-dev libxml2-dev libxslt1-dev
+        run: sudo apt update && sudo apt install -y build-essential curl git gsfonts imagemagick libcurl4-openssl-dev libidn11-dev libmagickwand-dev libssl-dev libxml2-dev libxslt1-dev
       - name: Start MySQL
         run: sudo systemctl start mysql.service
         if: matrix.db == 'mysql'
diff --git a/Changelog.md b/Changelog.md
index fea2b58aa..b40deafc8 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -42,6 +42,7 @@ Although the chat was never enabled per default and was marked as experimental,
 * Cache local posts/comments count for statistics [#8241](https://github.com/diaspora/diaspora/pull/8241)
 * Fix html-syntax in some handlebars templates [#8251](https://github.com/diaspora/diaspora/pull/8251)
 * Remove `chat_enabled` flag from archive export [#8265](https://github.com/diaspora/diaspora/pull/8265)
+* Change thumbnails in image slideshow to squares [#8275](https://github.com/diaspora/diaspora/pull/8275)
 
 ## Bug fixes
 
diff --git a/app/assets/stylesheets/gallery.scss b/app/assets/stylesheets/gallery.scss
index 67a1a467c..6780c2b3b 100644
--- a/app/assets/stylesheets/gallery.scss
+++ b/app/assets/stylesheets/gallery.scss
@@ -55,7 +55,6 @@ $margin: 15px;
 
     li {
       border: 0;
-      border-radius: $thumbnail-size / 2;
       height: $thumbnail-size;
       margin: $margin 6px;
       vertical-align: middle;