diff --git a/runtime/themes/serika-dark.toml b/runtime/themes/serika-dark.toml
index f6cff99e9dc2..6c0f5c1ea3bb 100644
--- a/runtime/themes/serika-dark.toml
+++ b/runtime/themes/serika-dark.toml
@@ -61,7 +61,7 @@
 
 "diff.plus" = { fg = "green" }
 "diff.delta" = { fg = "orange" }
-"diff.minus" = { fg = "red" }
+"diff.minus" = { fg = "nasty-red" }
 
 "markup.heading" = { fg = "purple", modifiers = ["bold"] }
 "markup.list" = "cyan"
diff --git a/runtime/themes/serika-light.toml b/runtime/themes/serika-light.toml
index d674940093ac..2d2e122a6ab3 100644
--- a/runtime/themes/serika-light.toml
+++ b/runtime/themes/serika-light.toml
@@ -59,9 +59,9 @@
 "error" = "nasty-red"
 "diagnostic" = { fg = "nasty-red", modifiers = ["underlined"] }
 
-"diff.plus" = { fg = "green" }
-"diff.delta" = { fg = "orange" }
-"diff.minus" = { fg = "red" }
+"diff.plus" = { fg = "bg_green"
+"diff.delta" = { fg = "bg_blue" }
+"diff.minus" = { fg = "nasty-red" }
 
 "markup.heading" = { fg = "purple", modifiers = ["bold"] }
 "markup.list" = "cyan"