diff --git a/application/Espo/Resources/metadata/themes/Dark.json b/application/Espo/Resources/metadata/themes/Dark.json
index f3b4296e94..2bea3aceef 100644
--- a/application/Espo/Resources/metadata/themes/Dark.json
+++ b/application/Espo/Resources/metadata/themes/Dark.json
@@ -11,10 +11,10 @@
     "chartColorAlternativeList": ["#7492cc", "#c29c4a", "#a1404a", "#6a5f96", "#b07e53"],
     "calendarColors": {
         "": "#a58dc7a0",
-        "bg": "#3e485ab3",
-        "Meeting": "#697da5",
-        "Call": "#a1404a",
-        "Task": "#5d8a55"
+        "bg": "#374050b3",
+        "Meeting": "#4c5972",
+        "Call": "#9b4260",
+        "Task": "#52744c"
     },
     "isDark": true
 }
diff --git a/frontend/less/dark/variables.less b/frontend/less/dark/variables.less
index dd8a03c21a..d3395a0ea4 100644
--- a/frontend/less/dark/variables.less
+++ b/frontend/less/dark/variables.less
@@ -109,7 +109,7 @@
 @select-item-border-value: @btn-default-border-value;
 
 @calendar-today-bg-value: @table-bg-accent-value;
-@calendar-border-value: #666363;
+@calendar-border-value: @default-border-color-value;
 @calendar-busy-bg-value: #523636;
 
 @label-color-value: #dfdfdf;