diff --git a/.rubocop.yml b/.rubocop.yml
index 380ba4ace..a7c32aafe 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -573,6 +573,9 @@ Style/IdenticalConditionalBranches:
 Style/IfWithBooleanLiteralBranches:
   Enabled: true
 
+Style/LineEndConcatenation:
+  Enabled: true
+
 Style/MapToHash:
   Enabled: true
 
diff --git a/spec/components/shared/link_list_component_spec.rb b/spec/components/shared/link_list_component_spec.rb
index f6ae9a3d4..962f07c30 100644
--- a/spec/components/shared/link_list_component_spec.rb
+++ b/spec/components/shared/link_list_component_spec.rb
@@ -18,9 +18,12 @@ describe Shared::LinkListComponent do
       ["Home", "/"], ["Info", "/info"], class: "menu"
     )
 
-    expect(page).to be_rendered with: '<ul class="menu">' + "\n" +
-                                      '<li><a href="/">Home</a></li>' + "\n" +
-                                      '<li><a href="/info">Info</a></li>' + "\n</ul>\n"
+    expect(page).to be_rendered with: <<~HTML
+      <ul class="menu">
+      <li><a href="/">Home</a></li>
+      <li><a href="/info">Info</a></li>
+      </ul>
+    HTML
   end
 
   it "accepts anchor tags" do
@@ -28,9 +31,12 @@ describe Shared::LinkListComponent do
       '<a href="/">Home</a>'.html_safe, ["Info", "/info"], class: "menu"
     )
 
-    expect(page).to be_rendered with: '<ul class="menu">' + "\n" +
-                                      '<li><a href="/">Home</a></li>' + "\n" +
-                                      '<li><a href="/info">Info</a></li>' + "\n</ul>\n"
+    expect(page).to be_rendered with: <<~HTML
+      <ul class="menu">
+      <li><a href="/">Home</a></li>
+      <li><a href="/info">Info</a></li>
+      </ul>
+    HTML
   end
 
   it "accepts options for links" do
diff --git a/spec/system/admin/budget_investments_spec.rb b/spec/system/admin/budget_investments_spec.rb
index 43c0f16d0..ac7408eee 100644
--- a/spec/system/admin/budget_investments_spec.rb
+++ b/spec/system/admin/budget_investments_spec.rb
@@ -1797,8 +1797,8 @@ describe "Admin budget investments", :admin do
       columns_cookie = cookies.find { |cookie| cookie[:name] == "investments-columns" }
       cookie_value = columns_cookie[:value]
 
-      expect(cookie_value).to eq("id,title,supports,admin,valuator,geozone," +
-        "feasibility,price,valuation_finished,visible_to_valuators,selected,incompatible")
+      expect(cookie_value).to eq("id,title,supports,admin,valuator,geozone,feasibility,price," \
+                                 "valuation_finished,visible_to_valuators,selected,incompatible")
     end
 
     scenario "Use column selector to display visible columns" do
@@ -1847,8 +1847,8 @@ describe "Admin budget investments", :admin do
       columns_cookie = cookies.find { |cookie| cookie[:name] == "investments-columns" }
       cookie_value = columns_cookie[:value]
 
-      expect(cookie_value).to eq("id,supports,admin,geozone," +
-        "feasibility,valuation_finished,visible_to_valuators,selected,incompatible,author")
+      expect(cookie_value).to eq("id,supports,admin,geozone,feasibility,valuation_finished," \
+                                 "visible_to_valuators,selected,incompatible,author")
 
       visit admin_budget_budget_investments_path(budget)
 
@@ -1856,8 +1856,8 @@ describe "Admin budget investments", :admin do
       columns_cookie = cookies.find { |cookie| cookie[:name] == "investments-columns" }
       cookie_value = columns_cookie[:value]
 
-      expect(cookie_value).to eq("id,supports,admin,geozone,feasibility,valuation_finished," +
-        "visible_to_valuators,selected,incompatible,author")
+      expect(cookie_value).to eq("id,supports,admin,geozone,feasibility,valuation_finished," \
+                                 "visible_to_valuators,selected,incompatible,author")
     end
 
     scenario "Select an investment when some columns are not displayed" do