diff --git a/backend.patch b/backend.patch
deleted file mode 100644
index ea0e98b..0000000
--- a/backend.patch
+++ /dev/null
@@ -1,26 +0,0 @@
-diff --git a/build.gradle b/build.gradle
-index edfdf66..c7cfa4d 100644
---- a/build.gradle
-+++ b/build.gradle
-@@ -40,7 +40,7 @@ dependencies {
-     implementation 'com.squareup.okhttp3:okhttp'
-     implementation 'com.squareup.okhttp3:okhttp-brotli'
-     implementation 'io.sentry:sentry:6.27.0'
--    implementation 'rocks.kavin:reqwest4j:1.0.6'
-+    implementation files('libs/reqwest4j.jar')
-     implementation 'io.minio:minio:8.5.4'
- }
- 
-diff --git a/src/main/java/me/kavin/piped/Main.java b/src/main/java/me/kavin/piped/Main.java
-index a5a8b57..4f9e6ed 100644
---- a/src/main/java/me/kavin/piped/Main.java
-+++ b/src/main/java/me/kavin/piped/Main.java
-@@ -41,7 +41,7 @@ public class Main {
-         ReqwestUtils.init(Constants.REQWEST_PROXY);
- 
-         Sentry.init(options -> {
--            options.setDsn(Constants.SENTRY_DSN);
-+            options.setDsn("");
-             options.setRelease(Constants.VERSION);
-             options.addIgnoredExceptionForType(ErrorResponse.class);
-             options.setTracesSampleRate(0.1);
diff --git a/build.sh b/build.sh
index abe6007..addd112 100755
--- a/build.sh
+++ b/build.sh
@@ -1,5 +1,5 @@
-#!/usr/bin/env ash
-# shellcheck shell=dash
+#!/usr/bin/env bash
+# shellcheck source=patcher.sh
 
 WORKDIR=$(pwd)
 
@@ -31,6 +31,7 @@ try_exec () {
 }
 
 set_piped_version () {
+    # From GitHub Actions
     commit_date=$(git log -1 --date=short --pretty=format:%cd)
     commit_sha=$(git rev-parse --short HEAD)
     echo "$commit_date-$commit_sha" >VERSION
@@ -54,19 +55,9 @@ title 'Cloning repositories...'
 [ -e reqwest4j ] || clone https://github.com/TeamPiped/reqwest4j reqwest4j
 
 title 'Applying patches...'
-if [ "$1" != "patched" ]
-then
-    title 'Hint:'
-    echo "if you've already applied patches,"
-    echo "call this script specifying \"patched\" arg, i.e."
-    echo "./build.sh patched"
-    echo
-
-    cd_and_exec backend git apply ../backend.patch
-    cd_and_exec reqwest4j git apply ../reqwest4j.patch
-else
-    echo 'Already applied, skipping'
-fi
+source patcher.sh
+cd_and_exec backend patch_backend
+cd_and_exec reqwest4j patch_reqwest4j
 
 
 # ---
@@ -125,7 +116,6 @@ title 'Adding reqwest4j JAR into Piped sources...'
 cd_and_exec backend mkdir -p libs
 cd_and_exec backend/libs mv "$REQ4J" ./
 
-# From GitHub Actions
 title 'Creating VERSION file...'
 cd_and_exec backend set_piped_version
 
diff --git a/patcher.sh b/patcher.sh
new file mode 100644
index 0000000..bec4453
--- /dev/null
+++ b/patcher.sh
@@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+
+patch_backend () {
+    patcher \
+        build.gradle \
+        -e "s/implementation 'rocks.kavin:reqwest4j:.*'/implementation files('libs/reqwest4j.jar')/"
+    
+    patcher \
+        src/main/java/me/kavin/piped/Main.java \
+        -e 's/options\.setDsn\(Constants\.SENTRY_DSN\)/options.setDsn("")/'
+}
+
+patch_reqwest4j () {
+    patcher \
+        build.gradle \
+        -e '/rust\(project\(":reqwest-jni"\)\)/d'
+    
+    patcher \
+        reqwest-jni/build.gradle.kts \
+        -e 's/command\.set\("cross"\)/command.set("cargo")/' \
+        -e ' /command\.set\("cargo"\)/a cargoInstallTargets.set(true)' \
+        -e ' /targets \+= target\(".*-unknown-linux-gnu", "libreqwest\.so"\)/d' \
+        -e ' /cargoInstallTargets\.set\(true\)/a targets += target("x86_64-unknown-linux-musl", "libreqwest.so")'
+}
+
+patcher () {
+    if grep '//patched' "$1" >/dev/null
+    then
+        echo "$1: already patched"
+        return
+    fi
+
+    file="$1"
+    shift
+    sed -i -E "$@" -e '1i //patched' "$file"
+}
diff --git a/reqwest4j.patch b/reqwest4j.patch
deleted file mode 100644
index b14cfce..0000000
--- a/reqwest4j.patch
+++ /dev/null
@@ -1,31 +0,0 @@
-diff --git a/build.gradle b/build.gradle
-index 4a0df70..46e6f0c 100644
---- a/build.gradle
-+++ b/build.gradle
-@@ -10,10 +10,6 @@ repositories {
-     mavenCentral()
- }
- 
--dependencies {
--    rust(project(":reqwest-jni"))
--}
--
- // javac -h
- tasks.register('generateJniHeaders', JavaCompile) {
-     classpath = sourceSets.main.compileClasspath
-diff --git a/reqwest-jni/build.gradle.kts b/reqwest-jni/build.gradle.kts
-index 189a81d..1c22153 100644
---- a/reqwest-jni/build.gradle.kts
-+++ b/reqwest-jni/build.gradle.kts
-@@ -4,8 +4,8 @@ plugins {
- 
- rust {
-     release.set(true)
--    command.set("cross")
-+    command.set("cargo")
-+    cargoInstallTargets.set(true)
- 
--    targets += target("aarch64-unknown-linux-gnu", "libreqwest.so")
--    targets += target("x86_64-unknown-linux-gnu", "libreqwest.so")
-+    targets += target("x86_64-unknown-linux-musl", "libreqwest.so")
- }