diff --git a/css/css_test.go b/css/css_test.go
index 2052972a8..70537b1da 100644
--- a/css/css_test.go
+++ b/css/css_test.go
@@ -80,6 +80,7 @@ func TestCSS(t *testing.T) {
 		{"a{@media screen and (min-width:1024px){ width: 40%; } & h1 { font-size: clamp(2.5rem, 1rem + 3vw, 3.5rem)}}", "a{@media screen and (min-width:1024px){width: 40%;}& h1 { font-size: clamp(2.5rem, 1rem + 3vw, 3.5rem)}}"},      // #602
 		{"a{padding:calc(var(--dce-edge-xsmall,6px) - 2px) calc(var(--dce-button-horizontal-padding,18px) - 2px)}", "a{padding:calc(var(--dce-edge-xsmall,6px) - 2px)calc(var(--dce-button-horizontal-padding,18px) - 2px)}"},            // #673
 		{"a{border-color:var(--dce-brand-color,#01A982)var(--dce-brand-color,#01A982)var(--dce-border-weak,#0000001F)}", "a{border-color:var(--dce-brand-color,#01A982)var(--dce-brand-color,#01A982)var(--dce-border-weak,#0000001F)}"}, // #673
+		{"a{& :is(b) { } }", "a{& :is(b){}}"}, // #908
 	}
 
 	m := minify.New()
diff --git a/go.mod b/go.mod
index 1b5b85fc9..18e2e64b0 100644
--- a/go.mod
+++ b/go.mod
@@ -8,7 +8,7 @@ require (
 	github.com/djherbis/atime v1.1.0
 	github.com/fsnotify/fsnotify v1.9.0
 	github.com/tdewolff/argp v0.0.0-20250430135133-0f54527d2b1e
-	github.com/tdewolff/parse/v2 v2.8.5
+	github.com/tdewolff/parse/v2 v2.8.6
 	github.com/tdewolff/test v1.0.11
 )
 
diff --git a/go.sum b/go.sum
index 5a2c5af73..c408e9302 100644
--- a/go.sum
+++ b/go.sum
@@ -16,8 +16,8 @@ github.com/pelletier/go-toml v1.9.5 h1:4yBQzkHv+7BHq2PQUZF3Mx0IYxG7LsP222s7Agd3v
 github.com/pelletier/go-toml v1.9.5/go.mod h1:u1nR/EPcESfeI/szUZKdtJ0xRNbUoANCkoOuaOx1Y+c=
 github.com/tdewolff/argp v0.0.0-20250430135133-0f54527d2b1e h1:2jfHhbjBKS2wfyvcz5W2eOkQVKv57DKM1C/QYhTovhs=
 github.com/tdewolff/argp v0.0.0-20250430135133-0f54527d2b1e/go.mod h1:xw2b1X81m4zY1OGytzHNr/YKXbf/STHkK5idoNamlYE=
-github.com/tdewolff/parse/v2 v2.8.5 h1:ZmBiA/8Do5Rpk7bDye0jbbDUpXXbCdc3iah4VeUvwYU=
-github.com/tdewolff/parse/v2 v2.8.5/go.mod h1:Hwlni2tiVNKyzR1o6nUs4FOF07URA+JLBLd6dlIXYqo=
+github.com/tdewolff/parse/v2 v2.8.6 h1:jJv54ee5Bot6xlYwc4TK5LPWUv7KYRxsmKK+Pa2ORXI=
+github.com/tdewolff/parse/v2 v2.8.6/go.mod h1:Hwlni2tiVNKyzR1o6nUs4FOF07URA+JLBLd6dlIXYqo=
 github.com/tdewolff/test v1.0.11 h1:FdLbwQVHxqG16SlkGveC0JVyrJN62COWTRyUFzfbtBE=
 github.com/tdewolff/test v1.0.11/go.mod h1:XPuWBzvdUzhCuxWO1ojpXsyzsA5bFoS3tO/Q3kFuTG8=
 golang.org/x/sys v0.37.0 h1:fdNQudmxPjkdUTPnLn5mdQv7Zwvbvpaxqs831goi9kQ=