diff --git a/build.gradle b/build.gradle
index 2bbff83a..79272749 100644
--- a/build.gradle
+++ b/build.gradle
@@ -265,7 +265,7 @@ dependencies {
                 11904: '1.19.4',
                 12001: '1.20.1',
                 12002: '1.20.2',
-                12003: '1.20.3-rc1',
+                12004: '1.20.4',
         ][mcVersion]
         mappings 'net.fabricmc:yarn:' + [
                 11404: '1.14.4+build.16',
@@ -284,9 +284,9 @@ dependencies {
                 11904: '1.19.4+build.1:v2',
                 12001: '1.20.1+build.2:v2',
                 12002: '1.20.2+build.4:v2',
-                12003: '1.20.3-rc1+build.2:v2',
+                12004: '1.20.4+build.1:v2',
         ][mcVersion]
-        modImplementation 'net.fabricmc:fabric-loader:0.14.11'
+        modImplementation 'net.fabricmc:fabric-loader:0.15.1'
         def fabricApiVersion = [
                 11404: '0.4.3+build.247-1.14',
                 11502: '0.5.1+build.294-1.15',
@@ -304,7 +304,7 @@ dependencies {
                 11904: '0.76.0+1.19.4',
                 12001: '0.83.1+1.20.1',
                 12002: '0.90.7+1.20.2',
-                12003: '0.91.1+1.20.3',
+                12004: '0.91.2+1.20.4',
         ][mcVersion]
         def fabricApiModules = [
                 "api-base",
@@ -385,7 +385,7 @@ dependencies {
 
     shadow 'com.github.ReplayMod.JavaBlend:2.79.0:a0696f8'
 
-    shadow "com.github.ReplayMod:ReplayStudio:5052121", shadeExclusions
+    shadow "com.github.ReplayMod:ReplayStudio:6cd39b0", shadeExclusions
 
     // FIXME this should be pulled in by ReplayStudio, and IntelliJ sees it, but javac for some reason does not
     implementation 'com.github.viaversion:opennbt:0a02214' // 2.0-SNAPSHOT (ViaVersion Edition)
diff --git a/jGui b/jGui
index b4a618ae..83f71ae3 160000
--- a/jGui
+++ b/jGui
@@ -1 +1 @@
-Subproject commit b4a618aef9f4a9260e8bb75368d75d95b6a72e0c
+Subproject commit 83f71ae3e20f5d8a93f81ce7f30f7547262d3c22
diff --git a/root.gradle.kts b/root.gradle.kts
index cef238dd..72cfd411 100755
--- a/root.gradle.kts
+++ b/root.gradle.kts
@@ -193,7 +193,7 @@ val doRelease by tasks.registering {
 defaultTasks("bundleJar")
 
 preprocess {
-    val mc12003 = createNode("1.20.3", 12003, "yarn")
+    val mc12004 = createNode("1.20.4", 12004, "yarn")
     val mc12002 = createNode("1.20.2", 12002, "yarn")
     val mc12001 = createNode("1.20.1", 12001, "yarn")
     val mc11904 = createNode("1.19.4", 11904, "yarn")
@@ -220,7 +220,7 @@ preprocess {
     val mc10800 = createNode("1.8", 10800, "srg")
     val mc10710 = createNode("1.7.10", 10710, "srg")
 
-    mc12003.link(mc12002, file("versions/mapping-fabric-1.20.3-1.20.2.txt"))
+    mc12004.link(mc12002, file("versions/mapping-fabric-1.20.4-1.20.2.txt"))
     mc12002.link(mc12001)
     mc12001.link(mc11904)
     mc11904.link(mc11903)
diff --git a/settings.gradle.kts b/settings.gradle.kts
index 3ab38e6b..bb1dd6e4 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -39,7 +39,7 @@ val jGuiVersions = listOf(
         "1.19.4",
         "1.20.1",
         "1.20.2",
-        "1.20.3",
+        "1.20.4",
 )
 val replayModVersions = listOf(
         // "1.7.10",
@@ -67,7 +67,7 @@ val replayModVersions = listOf(
         "1.19.4",
         "1.20.1",
         "1.20.2",
-        "1.20.3",
+        "1.20.4",
 )
 
 rootProject.buildFileName = "root.gradle.kts"
diff --git a/versions/1.20.3/src/main/java/com/replaymod/recording/mixin/MixinDownloadingPackFinder.java b/versions/1.20.4/src/main/java/com/replaymod/recording/mixin/MixinDownloadingPackFinder.java
similarity index 100%
rename from versions/1.20.3/src/main/java/com/replaymod/recording/mixin/MixinDownloadingPackFinder.java
rename to versions/1.20.4/src/main/java/com/replaymod/recording/mixin/MixinDownloadingPackFinder.java
diff --git a/versions/mapping-fabric-1.20.3-1.20.2.txt b/versions/mapping-fabric-1.20.4-1.20.2.txt
similarity index 100%
rename from versions/mapping-fabric-1.20.3-1.20.2.txt
rename to versions/mapping-fabric-1.20.4-1.20.2.txt