diff --git a/src/main/java/org/embeddedt/modernfix/common/mixin/core/BootstrapMixin.java b/src/main/java/org/embeddedt/modernfix/common/mixin/core/BootstrapMixin.java
index 52e582ba..1a108612 100644
--- a/src/main/java/org/embeddedt/modernfix/common/mixin/core/BootstrapMixin.java
+++ b/src/main/java/org/embeddedt/modernfix/common/mixin/core/BootstrapMixin.java
@@ -2,6 +2,7 @@ package org.embeddedt.modernfix.common.mixin.core;
 
 import net.minecraft.server.Bootstrap;
 import net.minecraftforge.network.NetworkConstants;
+import org.embeddedt.modernfix.forge.classloading.ManifestCompactor;
 import org.slf4j.Logger;
 import org.embeddedt.modernfix.forge.load.ModWorkManagerQueue;
 import org.embeddedt.modernfix.util.TimeFormatter;
@@ -25,6 +26,7 @@ public class BootstrapMixin {
         if(!isBootstrapped) {
             LOGGER.info("ModernFix reached bootstrap stage ({} after launch)", TimeFormatter.formatNanos(ManagementFactory.getRuntimeMXBean().getUptime() * 1000L * 1000L));
             ModWorkManagerQueue.replace();
+            ManifestCompactor.compactManifests();
         }
     }
 
diff --git a/src/main/java/org/embeddedt/modernfix/forge/classloading/ManifestCompactor.java b/src/main/java/org/embeddedt/modernfix/forge/classloading/ManifestCompactor.java
new file mode 100644
index 00000000..24bf22b9
--- /dev/null
+++ b/src/main/java/org/embeddedt/modernfix/forge/classloading/ManifestCompactor.java
@@ -0,0 +1,32 @@
+package org.embeddedt.modernfix.forge.classloading;
+
+import cpw.mods.jarhandling.impl.Jar;
+import net.minecraftforge.fml.loading.LoadingModList;
+
+import java.util.HashSet;
+import java.util.Set;
+import java.util.jar.Attributes;
+
+public class ManifestCompactor {
+    public static void compactManifests() {
+        for (var mfi : LoadingModList.get().getModFiles()) {
+            if (!(mfi.getFile().getSecureJar() instanceof Jar jar)) {
+                continue;
+            }
+            var manifest = jar.getManifest();
+            if (manifest == null) {
+                continue;
+            }
+            var entries = jar.getManifest().getEntries();
+            var entryKeys = new HashSet<>(entries.keySet());
+            var digests = Set.of(new Attributes.Name("SHA-256-Digest"), new Attributes.Name("SHA-384-Digest"));
+            entryKeys.forEach(key -> entries.compute(key, (k, attrs) -> {
+                if (attrs != null && attrs.keySet().stream().anyMatch(n -> n != null && !digests.contains(n))) {
+                    return attrs;
+                } else {
+                    return null;
+                }
+            }));
+        }
+    }
+}