diff --git a/src/main/java/net/fabricmc/loader/impl/discovery/BuiltinMetadataWrapper.java b/src/main/java/net/fabricmc/loader/impl/discovery/BuiltinMetadataWrapper.java
index e6888687d..f94391d67 100644
--- a/src/main/java/net/fabricmc/loader/impl/discovery/BuiltinMetadataWrapper.java
+++ b/src/main/java/net/fabricmc/loader/impl/discovery/BuiltinMetadataWrapper.java
@@ -23,6 +23,7 @@
 import java.util.Optional;
 
 import net.fabricmc.api.EnvType;
+import net.fabricmc.loader.api.FabricLoader;
 import net.fabricmc.loader.api.Version;
 import net.fabricmc.loader.api.metadata.ContactInformation;
 import net.fabricmc.loader.api.metadata.CustomValue;
@@ -138,7 +139,7 @@ public Collection<NestedJarEntry> getJars() {
 	}
 
 	@Override
-	public Collection<String> getMixinConfigs(EnvType type) {
+	public Collection<String> getMixinConfigs(EnvType type, FabricLoader loader) {
 		return Collections.emptyList();
 	}
 
diff --git a/src/main/java/net/fabricmc/loader/impl/launch/FabricMixinBootstrap.java b/src/main/java/net/fabricmc/loader/impl/launch/FabricMixinBootstrap.java
index 582b2c89b..f9731f739 100644
--- a/src/main/java/net/fabricmc/loader/impl/launch/FabricMixinBootstrap.java
+++ b/src/main/java/net/fabricmc/loader/impl/launch/FabricMixinBootstrap.java
@@ -80,7 +80,7 @@ public static void init(EnvType side, FabricLoaderImpl loader) {
 		Map<String, ModContainerImpl> configToModMap = new HashMap<>();
 
 		for (ModContainerImpl mod : loader.getModsInternal()) {
-			for (String config : mod.getMetadata().getMixinConfigs(side)) {
+			for (String config : mod.getMetadata().getMixinConfigs(side, loader)) {
 				ModContainerImpl prev = configToModMap.putIfAbsent(config, mod);
 				if (prev != null) throw new RuntimeException(String.format("Non-unique mixin config name %s used by %s and %s", config, prev.getMetadata().getId(), mod.getMetadata().getId()));
 
diff --git a/src/main/java/net/fabricmc/loader/impl/metadata/LoaderModMetadata.java b/src/main/java/net/fabricmc/loader/impl/metadata/LoaderModMetadata.java
index ef0807596..217266ea8 100644
--- a/src/main/java/net/fabricmc/loader/impl/metadata/LoaderModMetadata.java
+++ b/src/main/java/net/fabricmc/loader/impl/metadata/LoaderModMetadata.java
@@ -21,6 +21,7 @@
 import java.util.Map;
 
 import net.fabricmc.api.EnvType;
+import net.fabricmc.loader.api.FabricLoader;
 
 /**
  * Internal variant of the ModMetadata interface.
@@ -35,7 +36,7 @@ default String getOldStyleLanguageAdapter() {
 
 	Map<String, String> getLanguageAdapterDefinitions();
 	Collection<NestedJarEntry> getJars();
-	Collection<String> getMixinConfigs(EnvType type);
+	Collection<String> getMixinConfigs(EnvType type, FabricLoader loader);
 	/* @Nullable */
 	String getAccessWidener();
 	@Override
diff --git a/src/main/java/net/fabricmc/loader/impl/metadata/V0ModMetadata.java b/src/main/java/net/fabricmc/loader/impl/metadata/V0ModMetadata.java
index 82c814ba7..17e29d659 100644
--- a/src/main/java/net/fabricmc/loader/impl/metadata/V0ModMetadata.java
+++ b/src/main/java/net/fabricmc/loader/impl/metadata/V0ModMetadata.java
@@ -24,6 +24,7 @@
 import java.util.Optional;
 
 import net.fabricmc.api.EnvType;
+import net.fabricmc.loader.api.FabricLoader;
 import net.fabricmc.loader.api.Version;
 import net.fabricmc.loader.api.metadata.ContactInformation;
 import net.fabricmc.loader.api.metadata.CustomValue;
@@ -221,7 +222,7 @@ public Collection<String> getEntrypointKeys() {
 	public void emitFormatWarnings() { }
 
 	@Override
-	public Collection<String> getMixinConfigs(EnvType type) {
+	public Collection<String> getMixinConfigs(EnvType type, FabricLoader loader) {
 		List<String> mixinConfigs = new ArrayList<>(this.mixins.common);
 
 		switch (type) {
diff --git a/src/main/java/net/fabricmc/loader/impl/metadata/V1ModMetadata.java b/src/main/java/net/fabricmc/loader/impl/metadata/V1ModMetadata.java
index 5f00b8429..04dd7785c 100644
--- a/src/main/java/net/fabricmc/loader/impl/metadata/V1ModMetadata.java
+++ b/src/main/java/net/fabricmc/loader/impl/metadata/V1ModMetadata.java
@@ -22,9 +22,11 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Optional;
+import java.util.Set;
 import java.util.SortedMap;
 
 import net.fabricmc.api.EnvType;
+import net.fabricmc.loader.api.FabricLoader;
 import net.fabricmc.loader.api.Version;
 import net.fabricmc.loader.api.metadata.ContactInformation;
 import net.fabricmc.loader.api.metadata.CustomValue;
@@ -220,12 +222,12 @@ public Collection<NestedJarEntry> getJars() {
 	}
 
 	@Override
-	public Collection<String> getMixinConfigs(EnvType type) {
+	public Collection<String> getMixinConfigs(EnvType type, FabricLoader loader) {
 		final List<String> mixinConfigs = new ArrayList<>();
 
 		// This is only ever called once, so no need to store the result of this.
 		for (MixinEntry mixin : this.mixins) {
-			if (mixin.environment.matches(type)) {
+			if (mixin.environment.matches(type) && mixin.areDependencesMet(loader)) {
 				mixinConfigs.add(mixin.config);
 			}
 		}
@@ -306,10 +308,22 @@ public String getFile() {
 	static final class MixinEntry {
 		private final String config;
 		private final ModEnvironment environment;
+		private final Set<String> depends;
 
-		MixinEntry(String config, ModEnvironment environment) {
+		MixinEntry(String config, ModEnvironment environment, Set<String> depends) {
 			this.config = config;
 			this.environment = environment;
+			this.depends = depends;
+		}
+
+		public boolean areDependencesMet(FabricLoader loader) {
+			for (String modid : depends) {
+				if (!loader.isModLoaded(modid)) {
+					return false;
+				}
+			}
+
+			return true;
 		}
 	}
 
diff --git a/src/main/java/net/fabricmc/loader/impl/metadata/V1ModMetadataParser.java b/src/main/java/net/fabricmc/loader/impl/metadata/V1ModMetadataParser.java
index cf65a6ccc..37564b8b1 100644
--- a/src/main/java/net/fabricmc/loader/impl/metadata/V1ModMetadataParser.java
+++ b/src/main/java/net/fabricmc/loader/impl/metadata/V1ModMetadataParser.java
@@ -18,11 +18,14 @@
 
 import java.io.IOException;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.Comparator;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
+import java.util.Set;
 import java.util.SortedMap;
 import java.util.TreeMap;
 
@@ -104,7 +107,7 @@ static LoaderModMetadata parse(JsonReader reader) throws IOException, ParseMetad
 				break;
 			case "id":
 				if (reader.peek() != JsonToken.STRING) {
-					throw new ParseMetadataException("Mod id must be a non-empty string with a length of 3-64 characters.", reader);
+					throw new ParseMetadataException("Mod id must be a non-empty string with a length of 2-64 characters.", reader);
 				}
 
 				id = reader.nextString();
@@ -382,13 +385,14 @@ private static void readMixinConfigs(List<ParseWarning> warnings, JsonReader rea
 			switch (reader.peek()) {
 			case STRING:
 				// All mixin configs specified via string are assumed to be universal
-				mixins.add(new V1ModMetadata.MixinEntry(reader.nextString(), ModEnvironment.UNIVERSAL));
+				mixins.add(new V1ModMetadata.MixinEntry(reader.nextString(), ModEnvironment.UNIVERSAL, Collections.emptySet()));
 				break;
 			case BEGIN_OBJECT:
 				reader.beginObject();
 
 				String config = null;
 				ModEnvironment environment = null;
+				Set<String> depends = null;
 
 				while (reader.hasNext()) {
 					final String key = reader.nextName();
@@ -398,6 +402,27 @@ private static void readMixinConfigs(List<ParseWarning> warnings, JsonReader rea
 					case "environment":
 						environment = V1ModMetadataParser.readEnvironment(reader);
 						break;
+					case "depends":
+						if (reader.peek() != JsonToken.BEGIN_ARRAY) {
+							warnings.add(new ParseWarning(reader.getLineNumber(), reader.getColumn(), "Mixin config \"depends\" must be an array"));
+							reader.skipValue();
+							continue;
+						}
+
+						reader.beginArray();
+						depends = new HashSet<>();
+
+						while (reader.hasNext()) {
+							if (reader.peek() == JsonToken.STRING) {
+								depends.add(reader.nextString());
+							} else {
+								warnings.add(new ParseWarning(reader.getLineNumber(), reader.getColumn(), "Invalid mixin config dependency type"));
+								reader.skipValue();
+							}
+						}
+
+						reader.endArray();
+						break;
 					case "config":
 						if (reader.peek() != JsonToken.STRING) {
 							throw new ParseMetadataException("Value of \"config\" must be a string", reader);
@@ -417,11 +442,15 @@ private static void readMixinConfigs(List<ParseWarning> warnings, JsonReader rea
 					environment = ModEnvironment.UNIVERSAL; // Default to universal
 				}
 
+				if (depends == null) {
+					depends = Collections.emptySet(); // Default to depending on nothing
+				}
+
 				if (config == null) {
 					throw new ParseMetadataException.MissingField("Missing mandatory key 'config' in mixin entry!");
 				}
 
-				mixins.add(new V1ModMetadata.MixinEntry(config, environment));
+				mixins.add(new V1ModMetadata.MixinEntry(config, environment, depends));
 				break;
 			default:
 				warnings.add(new ParseWarning(reader.getLineNumber(), reader.getColumn(), "Invalid mixin entry type"));