diff --git a/index.toml b/index.toml
index 067c4bd..5540862 100644
--- a/index.toml
+++ b/index.toml
@@ -522,6 +522,11 @@ file = "mods/entitytexturefeatures.pw.toml"
 hash = "19b66c624b16ef3616b9ab37f18b630f04088d18f4982a0d7df9204b55e31353"
 metafile = true
 
+[[files]]
+file = "mods/extreme_sound_muffler.pw.toml"
+hash = "b282eff23747c57a4138074362b1314a1769db12cc012f0aca04e698faee8da2"
+metafile = true
+
 [[files]]
 file = "mods/fabric-api.pw.toml"
 hash = "f6f8827bc39d892a56351a6cecd39176addebb2ebf1c608b761b0d1985080b05"
diff --git a/mods/extreme_sound_muffler.pw.toml b/mods/extreme_sound_muffler.pw.toml
new file mode 100644
index 0000000..d3a00e8
--- /dev/null
+++ b/mods/extreme_sound_muffler.pw.toml
@@ -0,0 +1,13 @@
+name = "Extreme sound muffler"
+filename = "extremesoundmuffler-3.41-fabric-1.20.jar"
+side = "client"
+
+[download]
+url = "https://cdn.modrinth.com/data/5IIKsxiL/versions/ldNGPYFy/extremesoundmuffler-3.41-fabric-1.20.jar"
+hash-format = "sha1"
+hash = "074b319a83d757ee6954b5cb9d8d480dc817aaea"
+
+[update]
+[update.modrinth]
+mod-id = "5IIKsxiL"
+version = "ldNGPYFy"
diff --git a/pack.toml b/pack.toml
index 3089872..7f93650 100644
--- a/pack.toml
+++ b/pack.toml
@@ -6,7 +6,7 @@ pack-format = "packwiz:1.1.0"
 [index]
 file = "index.toml"
 hash-format = "sha256"
-hash = "98f40d289e3e1336331699589fa5d441d8d1d1e7f48971f78b04c29fa82ef114"
+hash = "e1ff6151313e8d12fef3512ceec9abba165fcb0261e5882c3e1cb99b293e4038"
 
 [versions]
 fabric = "0.15.3"