diff --git a/apps/theming/fonts/OpenDyslexic-Bold.otf b/apps/theming/fonts/OpenDyslexic-Bold.otf
index 7d074cbddeef9..4c492e2fcc283 100644
Binary files a/apps/theming/fonts/OpenDyslexic-Bold.otf and b/apps/theming/fonts/OpenDyslexic-Bold.otf differ
diff --git a/apps/theming/fonts/OpenDyslexic-Bold.ttf b/apps/theming/fonts/OpenDyslexic-Bold.ttf
deleted file mode 100644
index 25cf37f99e21f..0000000000000
Binary files a/apps/theming/fonts/OpenDyslexic-Bold.ttf and /dev/null differ
diff --git a/apps/theming/fonts/OpenDyslexic-Bold.woff b/apps/theming/fonts/OpenDyslexic-Bold.woff
deleted file mode 100644
index 41886ae9ddaf2..0000000000000
Binary files a/apps/theming/fonts/OpenDyslexic-Bold.woff and /dev/null differ
diff --git a/apps/theming/fonts/OpenDyslexic-Regular.otf b/apps/theming/fonts/OpenDyslexic-Regular.otf
index ebef13c4ce374..1226d2ab28190 100644
Binary files a/apps/theming/fonts/OpenDyslexic-Regular.otf and b/apps/theming/fonts/OpenDyslexic-Regular.otf differ
diff --git a/apps/theming/fonts/OpenDyslexic-Regular.ttf b/apps/theming/fonts/OpenDyslexic-Regular.ttf
deleted file mode 100644
index 4b0cb8c46b79f..0000000000000
Binary files a/apps/theming/fonts/OpenDyslexic-Regular.ttf and /dev/null differ
diff --git a/apps/theming/fonts/OpenDyslexic-Regular.woff b/apps/theming/fonts/OpenDyslexic-Regular.woff
deleted file mode 100644
index 26a2934d64055..0000000000000
Binary files a/apps/theming/fonts/OpenDyslexic-Regular.woff and /dev/null differ
diff --git a/apps/theming/lib/Themes/DyslexiaFont.php b/apps/theming/lib/Themes/DyslexiaFont.php
index 3275a005c8d4a..9f8a0a048d694 100644
--- a/apps/theming/lib/Themes/DyslexiaFont.php
+++ b/apps/theming/lib/Themes/DyslexiaFont.php
@@ -61,30 +61,22 @@ public function getCSSVariables(): array {
 	}
 
 	public function getCustomCss(): string {
-		$fontPathWoff = $this->urlGenerator->linkTo('theming', 'fonts/OpenDyslexic-Regular.woff');
 		$fontPathOtf = $this->urlGenerator->linkTo('theming', 'fonts/OpenDyslexic-Regular.otf');
-		$fontPathTtf = $this->urlGenerator->linkTo('theming', 'fonts/OpenDyslexic-Regular.ttf');
-		$boldFontPathWoff = $this->urlGenerator->linkTo('theming', 'fonts/OpenDyslexic-Bold.woff');
 		$boldFontPathOtf = $this->urlGenerator->linkTo('theming', 'fonts/OpenDyslexic-Bold.otf');
-		$boldFontPathTtf = $this->urlGenerator->linkTo('theming', 'fonts/OpenDyslexic-Bold.ttf');
 
 		return "
 			@font-face {
 				font-family: 'OpenDyslexic';
 				font-style: normal;
 				font-weight: 400;
-				src: url('$fontPathWoff') format('woff'),
-					 url('$fontPathOtf') format('opentype'),
-					 url('$fontPathTtf') format('truetype');
+				src: url('$fontPathOtf') format('opentype');
 			}
-			
+
 			@font-face {
 				font-family: 'OpenDyslexic';
 				font-style: normal;
 				font-weight: 700;
-				src: url('$boldFontPathWoff') format('woff'),
-					 url('$boldFontPathOtf') format('opentype'),
-					 url('$boldFontPathTtf') format('truetype');
+				src: url('$boldFontPathOtf') format('opentype');
 			}
 		";
 	}
diff --git a/apps/theming/tests/Themes/DyslexiaFontTest.php b/apps/theming/tests/Themes/DyslexiaFontTest.php
index a526f94d4aa1c..64aa770a9e608 100644
--- a/apps/theming/tests/Themes/DyslexiaFontTest.php
+++ b/apps/theming/tests/Themes/DyslexiaFontTest.php
@@ -170,7 +170,7 @@ public function testGetCustomCss($webRoot, $prettyUrlsEnabled) {
 			->with('htaccess.IgnoreFrontController', false)
 			->willReturn($prettyUrlsEnabled);
 
-		$this->assertStringContainsString("'$webRoot/apps/theming/fonts/OpenDyslexic-Regular.woff'", $this->dyslexiaFont->getCustomCss());
+		$this->assertStringContainsString("'$webRoot/apps/theming/fonts/OpenDyslexic-Regular.otf'", $this->dyslexiaFont->getCustomCss());
 		$this->assertStringNotContainsString('index.php', $this->dyslexiaFont->getCustomCss());
 	}
 }