diff --git a/.gitignore b/.gitignore
index 9ae545fea..7899d1c64 100644
--- a/.gitignore
+++ b/.gitignore
@@ -19,3 +19,7 @@
 *.iws
 
 *.launch
+mappings/.gradle/
+mappings/mcp/
+mappings/build/
+mappings/*.csv
diff --git a/build.gradle b/build.gradle
index 9024fbede..05e6f1809 100644
--- a/build.gradle
+++ b/build.gradle
@@ -19,6 +19,8 @@ apply plugin: 'eclipse'
 apply plugin: 'idea'
 apply plugin: 'maven'
 
+repositories { mavenLocal() }
+
 group = "com.github.glitchfiend.biomesoplenty"
 archivesBaseName = "BiomesOPlenty"
 
@@ -115,8 +117,6 @@ curseforge {
     }
 }
 
-
-
 artifacts {
     if (changelog_file.exists()) {
         archives changelog_file
diff --git a/gradle.properties b/gradle.properties
index fe594fe32..1c1c4ef54 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -5,9 +5,9 @@ org.gradle.daemon=false
 
 mod_version=9.0.0
 
-minecraft_version=1.14.4
-minecraft_version_toml=14
-forge_version=28.1.0
-forge_version_toml=28
+minecraft_version=1.15.1
+minecraft_version_toml=15
+forge_version=30.0.15
+forge_version_toml=30
 forge_group=net.minecraftforge
-mappings_version=20191221-1.14.3
+mappings_version=2-1.15.1
diff --git a/mappings/build.gradle b/mappings/build.gradle
new file mode 100644
index 000000000..0de6529d3
--- /dev/null
+++ b/mappings/build.gradle
@@ -0,0 +1,54 @@
+apply plugin: 'java'
+apply plugin: 'maven'
+ 
+ext.channel = 'snapshot'
+ext.dlVersion = '2'
+ext.mcVersion = '1.15.1'
+ 
+group = 'de.oceanlabs.mcp'
+version = dlVersion + '-' + mcVersion
+archivesBaseName = 'mcp_' + ext.channel
+ 
+def downloadCSV(name) {
+    mkdir 'mcp'
+    def out = new File('mcp/' + name)
+    new URL('http://export.mcpbot.bspk.rs/' + name).withInputStream{ i -> out.withOutputStream{ it << i }}
+}
+
+task downloadCSVs {
+    downloadCSV('fields.csv')
+    downloadCSV('methods.csv')
+    downloadCSV('params.csv')
+}
+
+task patchCSVs {
+    println 'Patching csvs..'
+
+    // Apparently making this an Exec task doesn't work properly? Do this instead.
+    exec {
+        ignoreExitValue true
+        workingDir '.'
+
+        if (System.getProperty('os.name').toLowerCase(Locale.ROOT).contains('windows')) {
+            commandLine 'cmd', '/c', 'python', 'patch_csvs.py'
+        } else {
+            commandLine 'python', 'patch_csvs.py'
+        }
+    }
+}
+
+patchCSVs.dependsOn(downloadCSVs)
+
+jar {
+    extension = 'zip'
+    from '.'
+    include '*.csv'
+}
+ 
+install {
+    repositories.mavenInstaller {
+        pom.groupId = project.group;
+        pom.version = project.version
+        pom.artifactId = 'mcp_' + project.channel
+    }
+}
\ No newline at end of file
diff --git a/mappings/custom/methods.csv b/mappings/custom/methods.csv
new file mode 100644
index 000000000..505206524
--- /dev/null
+++ b/mappings/custom/methods.csv
@@ -0,0 +1,2 @@
+searge,name,side,desc
+func_225566_b_,configured,2,
diff --git a/mappings/patch_csvs.py b/mappings/patch_csvs.py
new file mode 100644
index 000000000..aedb46eef
--- /dev/null
+++ b/mappings/patch_csvs.py
@@ -0,0 +1,67 @@
+import csv
+import os
+import shutil
+import sys
+
+entries = {
+    'fields.csv': [],
+    'methods.csv': [],
+    'params.csv': []
+}
+
+for key in entries.keys():
+    mcp_file = 'mcp/{}'.format(key)
+    patch_file = 'custom/{}'.format(key)
+
+    if not os.path.isfile(patch_file):
+        print('Copying {}...'.format(key))
+        shutil.copyfile(mcp_file, key)
+        continue
+
+    print('Patching {}...'.format(key))
+
+    header_row = []
+
+    # Read custom csv
+    with open(patch_file, 'r') as f:
+        reader = csv.reader(f)
+        for row in reader:
+            name = row[0]
+
+            if name.startswith('searge') or name.startswith('param'):
+                header_row = row
+                continue
+
+            entries[key].append(row)
+
+    # Read MCP csv and merge it
+    with open(mcp_file, 'r') as f:
+        reader = csv.reader(f)
+        for row in reader:
+            name = row[0]
+            existing = False
+
+            if name.startswith('searge') or name.startswith('param'):
+                continue
+
+            for existing_entry in entries[key]:
+                if name == existing_entry[0]:
+                    existing = True
+                    break
+
+            if not existing:
+                entries[key].append(row)
+
+    entries[key].sort(key=lambda x: x[0])
+
+    # Insert header at the start of the list
+    entries[key].insert(0, header_row)
+
+    # Write final output file
+    with open(key, 'w') as f:
+        writer = csv.writer(f, lineterminator='\n')
+
+        for row in entries[key]:
+            writer.writerow(row)
+
+    print('Created {}'.format(key))
\ No newline at end of file
diff --git a/settings.gradle b/settings.gradle
new file mode 100644
index 000000000..8af7f8ee0
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1,3 @@
+include 'mappings'
+
+gradle.startParameter.taskNames = [":mappings:build", ":mappings:install"] + gradle.startParameter.taskNames
\ No newline at end of file