diff --git a/main.go b/main.go
index 9e40971..28989d9 100644
--- a/main.go
+++ b/main.go
@@ -21,13 +21,14 @@ import (
 
 const (
 	// backgroundImageFilename = "images/bg.png"
-	radius      = 0
-	fontSize    = 12
-	textMarginX = 5.0
-	textMarginY = -2.0
-	badgeWidth  = 180
-	badgeHeight = 20
-	textStyle   = "text-anchor:right;font-size:12px;fill:white;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Helvetica,Arial,sans-serif,Apple Color Emoji,Segoe UI Emoji;"
+	radius             = 0
+	fontSize           = 12
+	textMarginX        = 5.0
+	textMarginY        = -2.0
+	badgeWidth         = 180
+	badgeHeight        = 20
+	textStyle          = "text-anchor:right;font-size:12px;fill:white;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Helvetica,Arial,sans-serif,Apple Color Emoji,Segoe UI Emoji;"
+	badgeExpireSeconds = 120
 )
 
 var (
@@ -94,6 +95,7 @@ func geneateSvg(client api.Client, c *gin.Context) error {
 
 	w := c.Writer
 	w.Header().Set("Content-Type", "image/svg+xml")
+	w.Header().Set("Cache-Control", fmt.Sprintf("max-age=%d, s-maxage=%d", badgeExpireSeconds, badgeExpireSeconds))
 	canvas := svg.New(w)
 	canvas.Start(badgeWidth, badgeHeight)
 	canvas.Rect(0, 0, badgeWidth, badgeHeight, "fill-opacity:1.00; fill:rgb(90,90,90)")
@@ -157,6 +159,7 @@ func generateBadge(client api.Client, c *gin.Context) error {
 	w := c.Writer
 	c.Status(http.StatusOK)
 	w.Header().Set("Content-Type", "image/png")
+	w.Header().Set("Cache-Control", fmt.Sprintf("max-age=%d, s-maxage=%d", badgeExpireSeconds, badgeExpireSeconds))
 	return dc.EncodePNG(w)
 }