diff --git a/Adjust/adjust/build.gradle b/Adjust/adjust/build.gradle
index cfc9e9a06..df3c67eb4 100644
--- a/Adjust/adjust/build.gradle
+++ b/Adjust/adjust/build.gradle
@@ -1,7 +1,7 @@
 apply plugin: 'com.android.library'
 
 def getVersionName() {
-    return "4.12.0"
+    return "4.12.1"
 }
 
 android {
diff --git a/Adjust/adjust/src/main/java/com/adjust/sdk/ActivityPackage.java b/Adjust/adjust/src/main/java/com/adjust/sdk/ActivityPackage.java
index e0a9eb2a1..8a0000473 100644
--- a/Adjust/adjust/src/main/java/com/adjust/sdk/ActivityPackage.java
+++ b/Adjust/adjust/src/main/java/com/adjust/sdk/ActivityPackage.java
@@ -143,13 +143,13 @@ public ActivityPackage(ActivityKind activityKind) {
     }
 
     public String toString() {
-        return String.format(Locale.US, "%s%s", activityKind.toString(), suffix);
+        return Util.formatString("%s%s", activityKind.toString(), suffix);
     }
 
     public String getExtendedString() {
         StringBuilder builder = new StringBuilder();
-        builder.append(String.format(Locale.US, "Path:      %s\n", path));
-        builder.append(String.format(Locale.US, "ClientSdk: %s\n", clientSdk));
+        builder.append(Util.formatString("Path:      %s\n", path));
+        builder.append(Util.formatString("ClientSdk: %s\n", clientSdk));
 
         if (parameters != null) {
             builder.append("Parameters:");
@@ -160,14 +160,14 @@ public String getExtendedString() {
                 if (stringsToExclude.contains(key)) {
                     continue;
                 }
-                builder.append(String.format(Locale.US, "\n\t%-16s %s", key,  entry.getValue()));
+                builder.append(Util.formatString("\n\t%-16s %s", key,  entry.getValue()));
             }
         }
         return builder.toString();
     }
 
     protected String getFailureMessage() {
-        return String.format(Locale.US, "Failed to track %s%s", activityKind.toString(), suffix);
+        return Util.formatString("Failed to track %s%s", activityKind.toString(), suffix);
     }
 
     private void writeObject(ObjectOutputStream stream) throws IOException {
diff --git a/Adjust/adjust/src/main/java/com/adjust/sdk/ActivityState.java b/Adjust/adjust/src/main/java/com/adjust/sdk/ActivityState.java
index 92b61495c..d80d1a4da 100644
--- a/Adjust/adjust/src/main/java/com/adjust/sdk/ActivityState.java
+++ b/Adjust/adjust/src/main/java/com/adjust/sdk/ActivityState.java
@@ -121,8 +121,7 @@ protected boolean findOrderId(String orderId) {
 
     @Override
     public String toString() {
-        return String.format(Locale.US,
-                "ec:%d sc:%d ssc:%d sl:%.1f ts:%.1f la:%s uuid:%s",
+        return Util.formatString("ec:%d sc:%d ssc:%d sl:%.1f ts:%.1f la:%s uuid:%s",
                 eventCount, sessionCount, subsessionCount,
                 sessionLength / 1000.0, timeSpent / 1000.0,
                 stamp(lastActivity), uuid);
@@ -214,8 +213,7 @@ private void writeObject(ObjectOutputStream stream) throws IOException {
     private static String stamp(long dateMillis) {
         Calendar calendar = Calendar.getInstance();
         calendar.setTimeInMillis(dateMillis);
-        return String.format(Locale.US,
-                "%02d:%02d:%02d",
+        return Util.formatString("%02d:%02d:%02d",
                 calendar.HOUR_OF_DAY,
                 calendar.MINUTE,
                 calendar.SECOND);
diff --git a/Adjust/adjust/src/main/java/com/adjust/sdk/AdjustAttribution.java b/Adjust/adjust/src/main/java/com/adjust/sdk/AdjustAttribution.java
index ccb09b1cc..03e93244b 100644
--- a/Adjust/adjust/src/main/java/com/adjust/sdk/AdjustAttribution.java
+++ b/Adjust/adjust/src/main/java/com/adjust/sdk/AdjustAttribution.java
@@ -87,7 +87,7 @@ public int hashCode() {
 
     @Override
     public String toString() {
-        return String.format(Locale.US, "tt:%s tn:%s net:%s cam:%s adg:%s cre:%s cl:%s adid:%s",
+        return Util.formatString("tt:%s tn:%s net:%s cam:%s adg:%s cre:%s cl:%s adid:%s",
                 trackerToken, trackerName, network, campaign, adgroup, creative, clickLabel, adid);
     }
 
diff --git a/Adjust/adjust/src/main/java/com/adjust/sdk/AdjustConfig.java b/Adjust/adjust/src/main/java/com/adjust/sdk/AdjustConfig.java
index 79d595405..9de97494f 100644
--- a/Adjust/adjust/src/main/java/com/adjust/sdk/AdjustConfig.java
+++ b/Adjust/adjust/src/main/java/com/adjust/sdk/AdjustConfig.java
@@ -135,8 +135,8 @@ public void setUserAgent(String userAgent) {
     }
 
     public void setAppSecret(long secretId, long info1, long info2, long info3, long info4) {
-        this.secretId = String.format("%d", secretId);
-        this.appSecret = String.format("%d%d%d%d", info1, info2, info3, info4);
+        this.secretId = Util.formatString("%d", secretId);
+        this.appSecret = Util.formatString("%d%d%d%d", info1, info2, info3, info4);
     }
 
     public void setReadMobileEquipmentIdentity(boolean readMobileEquipmentIdentity) {
diff --git a/Adjust/adjust/src/main/java/com/adjust/sdk/AdjustEventFailure.java b/Adjust/adjust/src/main/java/com/adjust/sdk/AdjustEventFailure.java
index 195635398..eeebc9e84 100644
--- a/Adjust/adjust/src/main/java/com/adjust/sdk/AdjustEventFailure.java
+++ b/Adjust/adjust/src/main/java/com/adjust/sdk/AdjustEventFailure.java
@@ -17,7 +17,7 @@ public class AdjustEventFailure {
 
     @Override
     public String toString() {
-        return String.format(Locale.US, "Event Failure msg:%s time:%s adid:%s event:%s retry:%b json:%s",
+        return Util.formatString("Event Failure msg:%s time:%s adid:%s event:%s retry:%b json:%s",
             message, timestamp, adid, eventToken, willRetry, jsonResponse);
     }
 }
diff --git a/Adjust/adjust/src/main/java/com/adjust/sdk/AdjustEventSuccess.java b/Adjust/adjust/src/main/java/com/adjust/sdk/AdjustEventSuccess.java
index 50091b071..6febb2109 100644
--- a/Adjust/adjust/src/main/java/com/adjust/sdk/AdjustEventSuccess.java
+++ b/Adjust/adjust/src/main/java/com/adjust/sdk/AdjustEventSuccess.java
@@ -16,7 +16,7 @@ public class AdjustEventSuccess {
 
     @Override
     public String toString() {
-        return String.format(Locale.US, "Event Success msg:%s time:%s adid:%s event:%s json:%s",
+        return Util.formatString("Event Success msg:%s time:%s adid:%s event:%s json:%s",
             message, timestamp, adid, eventToken, jsonResponse);
     }
 }
diff --git a/Adjust/adjust/src/main/java/com/adjust/sdk/AdjustSessionFailure.java b/Adjust/adjust/src/main/java/com/adjust/sdk/AdjustSessionFailure.java
index 308197ec6..9ef4978bc 100644
--- a/Adjust/adjust/src/main/java/com/adjust/sdk/AdjustSessionFailure.java
+++ b/Adjust/adjust/src/main/java/com/adjust/sdk/AdjustSessionFailure.java
@@ -16,7 +16,7 @@ public class AdjustSessionFailure {
 
     @Override
     public String toString() {
-        return String.format(Locale.US, "Session Failure msg:%s time:%s adid:%s retry:%b json:%s",
+        return Util.formatString("Session Failure msg:%s time:%s adid:%s retry:%b json:%s",
             message, timestamp, adid, willRetry, jsonResponse);
     }
 }
diff --git a/Adjust/adjust/src/main/java/com/adjust/sdk/AdjustSessionSuccess.java b/Adjust/adjust/src/main/java/com/adjust/sdk/AdjustSessionSuccess.java
index bb2ff9bb9..9c4dac459 100644
--- a/Adjust/adjust/src/main/java/com/adjust/sdk/AdjustSessionSuccess.java
+++ b/Adjust/adjust/src/main/java/com/adjust/sdk/AdjustSessionSuccess.java
@@ -15,7 +15,7 @@ public class AdjustSessionSuccess {
 
     @Override
     public String toString() {
-        return String.format(Locale.US, "Session Success msg:%s time:%s adid:%s json:%s",
+        return Util.formatString("Session Success msg:%s time:%s adid:%s json:%s",
                 message, timestamp, adid, jsonResponse);
     }
 }
diff --git a/Adjust/adjust/src/main/java/com/adjust/sdk/Constants.java b/Adjust/adjust/src/main/java/com/adjust/sdk/Constants.java
index be11a4cbf..4c9c2ba3c 100644
--- a/Adjust/adjust/src/main/java/com/adjust/sdk/Constants.java
+++ b/Adjust/adjust/src/main/java/com/adjust/sdk/Constants.java
@@ -29,7 +29,7 @@ public interface Constants {
     String BASE_URL = "https://app.adjust.com";
     String SCHEME = "https";
     String AUTHORITY = "app.adjust.com";
-    String CLIENT_SDK = "android4.12.0";
+    String CLIENT_SDK = "android4.12.1";
     String LOGTAG = "Adjust";
     String REFTAG = "reftag";
     String INSTALL_REFERRER = "install_referrer";
diff --git a/Adjust/adjust/src/main/java/com/adjust/sdk/DeviceInfo.java b/Adjust/adjust/src/main/java/com/adjust/sdk/DeviceInfo.java
index 2abb3523a..7d7db2dad 100644
--- a/Adjust/adjust/src/main/java/com/adjust/sdk/DeviceInfo.java
+++ b/Adjust/adjust/src/main/java/com/adjust/sdk/DeviceInfo.java
@@ -249,7 +249,7 @@ private String getClientSdk(String sdkPrefix) {
         if (sdkPrefix == null) {
             return Constants.CLIENT_SDK;
         } else {
-            return String.format(Locale.US, "%s@%s", sdkPrefix, Constants.CLIENT_SDK);
+            return Util.formatString("%s@%s", sdkPrefix, Constants.CLIENT_SDK);
         }
     }
 
diff --git a/Adjust/adjust/src/main/java/com/adjust/sdk/Logger.java b/Adjust/adjust/src/main/java/com/adjust/sdk/Logger.java
index 95e441a73..30ee98b67 100644
--- a/Adjust/adjust/src/main/java/com/adjust/sdk/Logger.java
+++ b/Adjust/adjust/src/main/java/com/adjust/sdk/Logger.java
@@ -56,9 +56,9 @@ public void verbose(String message, Object... parameters) {
         }
         if (logLevel.androidLogLevel <= Log.VERBOSE) {
             try {
-                Log.v(LOGTAG, String.format(Locale.US, message, parameters));
+                Log.v(LOGTAG, Util.formatString(message, parameters));
             } catch (Exception e) {
-                Log.e(LOGTAG, String.format(Locale.US, formatErrorMessage, message, Arrays.toString(parameters)));
+                Log.e(LOGTAG, Util.formatString(formatErrorMessage, message, Arrays.toString(parameters)));
             }
         }
     }
@@ -70,9 +70,9 @@ public void debug(String message, Object... parameters) {
         }
         if (logLevel.androidLogLevel <= Log.DEBUG) {
             try {
-                Log.d(LOGTAG, String.format(Locale.US, message, parameters));
+                Log.d(LOGTAG, Util.formatString(message, parameters));
             } catch (Exception e) {
-                Log.e(LOGTAG, String.format(Locale.US, formatErrorMessage, message, Arrays.toString(parameters)));
+                Log.e(LOGTAG, Util.formatString(formatErrorMessage, message, Arrays.toString(parameters)));
             }
         }
     }
@@ -84,9 +84,9 @@ public void info(String message, Object... parameters) {
         }
         if (logLevel.androidLogLevel <= Log.INFO) {
             try {
-                Log.i(LOGTAG, String.format(Locale.US, message, parameters));
+                Log.i(LOGTAG, Util.formatString(message, parameters));
             } catch (Exception e) {
-                Log.e(LOGTAG, String.format(Locale.US, formatErrorMessage, message, Arrays.toString(parameters)));
+                Log.e(LOGTAG, Util.formatString(formatErrorMessage, message, Arrays.toString(parameters)));
             }
         }
     }
@@ -98,9 +98,9 @@ public void warn(String message, Object... parameters) {
         }
         if (logLevel.androidLogLevel <= Log.WARN) {
             try {
-                Log.w(LOGTAG, String.format(Locale.US, message, parameters));
+                Log.w(LOGTAG, Util.formatString(message, parameters));
             } catch (Exception e) {
-                Log.e(LOGTAG, String.format(Locale.US, formatErrorMessage, message, Arrays.toString(parameters)));
+                Log.e(LOGTAG, Util.formatString(formatErrorMessage, message, Arrays.toString(parameters)));
             }
         }
     }
@@ -109,9 +109,9 @@ public void warn(String message, Object... parameters) {
     public void warnInProduction(String message, Object... parameters) {
         if (logLevel.androidLogLevel <= Log.WARN) {
             try {
-                Log.w(LOGTAG, String.format(Locale.US, message, parameters));
+                Log.w(LOGTAG, Util.formatString(message, parameters));
             } catch (Exception e) {
-                Log.e(LOGTAG, String.format(Locale.US, formatErrorMessage, message, Arrays.toString(parameters)));
+                Log.e(LOGTAG, Util.formatString(formatErrorMessage, message, Arrays.toString(parameters)));
             }
         }
     }
@@ -124,9 +124,9 @@ public void error(String message, Object... parameters) {
         }
         if (logLevel.androidLogLevel <= Log.ERROR) {
             try {
-                Log.e(LOGTAG, String.format(Locale.US, message, parameters));
+                Log.e(LOGTAG, Util.formatString(message, parameters));
             } catch (Exception e) {
-                Log.e(LOGTAG, String.format(Locale.US, formatErrorMessage, message, Arrays.toString(parameters)));
+                Log.e(LOGTAG, Util.formatString(formatErrorMessage, message, Arrays.toString(parameters)));
             }
         }
     }
@@ -138,9 +138,9 @@ public void Assert(String message, Object... parameters) {
         }
         if(logLevel.androidLogLevel <= Log.ASSERT) {
             try {
-                Log.println(Log.ASSERT, LOGTAG, String.format(Locale.US, message, parameters));
+                Log.println(Log.ASSERT, LOGTAG, Util.formatString(message, parameters));
             } catch (Exception e) {
-                Log.e(LOGTAG, String.format(Locale.US, formatErrorMessage, message, Arrays.toString(parameters)));
+                Log.e(LOGTAG, Util.formatString(formatErrorMessage, message, Arrays.toString(parameters)));
             }
         }
     }
diff --git a/Adjust/adjust/src/main/java/com/adjust/sdk/PackageBuilder.java b/Adjust/adjust/src/main/java/com/adjust/sdk/PackageBuilder.java
index 4a7db2e27..b791bc899 100644
--- a/Adjust/adjust/src/main/java/com/adjust/sdk/PackageBuilder.java
+++ b/Adjust/adjust/src/main/java/com/adjust/sdk/PackageBuilder.java
@@ -328,9 +328,9 @@ private void fillPluginKeys(Map<String, String> parameters) {
 
     private String getEventSuffix(AdjustEvent event) {
         if (event.revenue == null) {
-            return String.format(Locale.US, "'%s'", event.eventToken);
+            return Util.formatString("'%s'", event.eventToken);
         } else {
-            return String.format(Locale.US, "(%.5f %s, '%s')", event.revenue, event.currency, event.eventToken);
+            return Util.formatString("(%.5f %s, '%s')", event.revenue, event.currency, event.eventToken);
         }
     }
 
@@ -415,7 +415,7 @@ public static void addBoolean(Map<String, String> parameters, String key, Boolea
     public static void addDouble(Map<String, String> parameters, String key, Double value) {
         if (value == null) return;
 
-        String doubleString = String.format(Locale.US, "%.5f", value);
+        String doubleString = Util.formatString("%.5f", value);
 
         PackageBuilder.addString(parameters, key, doubleString);
     }
diff --git a/Adjust/adjust/src/main/java/com/adjust/sdk/RequestHandler.java b/Adjust/adjust/src/main/java/com/adjust/sdk/RequestHandler.java
index 85420f72c..9c596b088 100644
--- a/Adjust/adjust/src/main/java/com/adjust/sdk/RequestHandler.java
+++ b/Adjust/adjust/src/main/java/com/adjust/sdk/RequestHandler.java
@@ -90,7 +90,7 @@ private void sendI(ActivityPackage activityPackage, int queueSize) {
     private void closePackageI(ActivityPackage activityPackage, String message, Throwable throwable) {
         final String packageMessage = activityPackage.getFailureMessage();
         final String reasonString = Util.getReasonString(message, throwable);
-        String finalMessage = String.format("%s. (%s) Will retry later", packageMessage, reasonString);
+        String finalMessage = Util.formatString("%s. (%s) Will retry later", packageMessage, reasonString);
         logger.error(finalMessage);
 
         ResponseData responseData = ResponseData.buildResponseData(activityPackage);
@@ -108,7 +108,7 @@ private void closePackageI(ActivityPackage activityPackage, String message, Thro
     private void sendNextPackageI(ActivityPackage activityPackage, String message, Throwable throwable) {
         final String failureMessage = activityPackage.getFailureMessage();
         final String reasonString = Util.getReasonString(message, throwable);
-        String finalMessage = String.format("%s. (%s)", failureMessage, reasonString);
+        String finalMessage = Util.formatString("%s. (%s)", failureMessage, reasonString);
         logger.error(finalMessage);
 
         ResponseData responseData = ResponseData.buildResponseData(activityPackage);
diff --git a/Adjust/adjust/src/main/java/com/adjust/sdk/ResponseData.java b/Adjust/adjust/src/main/java/com/adjust/sdk/ResponseData.java
index 70da5f867..cddb019cb 100644
--- a/Adjust/adjust/src/main/java/com/adjust/sdk/ResponseData.java
+++ b/Adjust/adjust/src/main/java/com/adjust/sdk/ResponseData.java
@@ -47,7 +47,7 @@ public static ResponseData buildResponseData(ActivityPackage activityPackage) {
 
     @Override
     public String toString() {
-        return String.format(Locale.US, "message:%s timestamp:%s json:%s",
+        return Util.formatString("message:%s timestamp:%s json:%s",
                 message, timestamp, jsonResponse);
     }
 }
\ No newline at end of file
diff --git a/Adjust/adjust/src/main/java/com/adjust/sdk/SdkClickHandler.java b/Adjust/adjust/src/main/java/com/adjust/sdk/SdkClickHandler.java
index c9d6c1f5d..de8537d21 100644
--- a/Adjust/adjust/src/main/java/com/adjust/sdk/SdkClickHandler.java
+++ b/Adjust/adjust/src/main/java/com/adjust/sdk/SdkClickHandler.java
@@ -377,7 +377,7 @@ private void logErrorMessageI(final ActivityPackage sdkClickPackage,
                                   final Throwable throwable) {
         final String packageMessage = sdkClickPackage.getFailureMessage();
         final String reasonString = Util.getReasonString(message, throwable);
-        final String finalMessage = String.format("%s. (%s)", packageMessage, reasonString);
+        final String finalMessage = Util.formatString("%s. (%s)", packageMessage, reasonString);
 
         logger.error(finalMessage);
     }
diff --git a/Adjust/adjust/src/main/java/com/adjust/sdk/Util.java b/Adjust/adjust/src/main/java/com/adjust/sdk/Util.java
index 4abe71247..6b9da0ddf 100644
--- a/Adjust/adjust/src/main/java/com/adjust/sdk/Util.java
+++ b/Adjust/adjust/src/main/java/com/adjust/sdk/Util.java
@@ -77,7 +77,7 @@ public static String quote(String string) {
             return string;
         }
 
-        return String.format(Locale.US, "'%s'", string);
+        return Util.formatString("'%s'", string);
     }
 
     public static String getPlayAdId(Context context) {
@@ -448,7 +448,7 @@ public static String hash(final String text, final String method) {
     public static String convertToHex(final byte[] bytes) {
         final BigInteger bigInt = new BigInteger(1, bytes);
         final String formatString = "%0" + (bytes.length << 1) + "x";
-        return String.format(Locale.US, formatString, bigInt);
+        return Util.formatString(formatString, bigInt);
     }
 
     public static String[] getSupportedAbis() {
@@ -461,9 +461,9 @@ public static String getCpuAbi() {
 
     public static String getReasonString(String message, Throwable throwable) {
         if (throwable != null) {
-            return String.format(Locale.US, "%s: %s", message, throwable);
+            return Util.formatString("%s: %s", message, throwable);
         } else {
-            return String.format(Locale.US, "%s", message);
+            return Util.formatString("%s", message);
         }
     }
 
@@ -623,4 +623,8 @@ public static String getMnc(Context context) {
             return null;
         }
     }
+
+    public static String formatString(String format, Object... args) {
+        return String.format(Locale.US, format, args);
+    }
 }
\ No newline at end of file
diff --git a/Adjust/adjust/src/main/java/com/adjust/sdk/UtilNetworking.java b/Adjust/adjust/src/main/java/com/adjust/sdk/UtilNetworking.java
index e28939a3c..83367d171 100644
--- a/Adjust/adjust/src/main/java/com/adjust/sdk/UtilNetworking.java
+++ b/Adjust/adjust/src/main/java/com/adjust/sdk/UtilNetworking.java
@@ -148,7 +148,7 @@ private static ResponseData readHttpResponse(HttpsURLConnection connection, Acti
         try {
             jsonResponse = new JSONObject(stringResponse);
         } catch (JSONException e) {
-            String message = String.format("Failed to parse json response. (%s)", e.getMessage());
+            String message = Util.formatString("Failed to parse json response. (%s)", e.getMessage());
             logger.error(message);
             responseData.message = message;
         }
@@ -267,12 +267,12 @@ private static String buildAuthorizationHeader(Map<String, String> parameters,
         String signature = Util.sha256(signatureDetails.get("clear_signature"));
         String fields = signatureDetails.get("fields");
 
-        String secretIdHeader = String.format("secret_id=\"%s\"", secretId);
-        String signatureHeader = String.format("signature=\"%s\"", signature);
-        String algorithmHeader = String.format("algorithm=\"%s\"", algorithm);
-        String fieldsHeader = String.format("headers=\"%s\"", fields);
+        String secretIdHeader = Util.formatString("secret_id=\"%s\"", secretId);
+        String signatureHeader = Util.formatString("signature=\"%s\"", signature);
+        String algorithmHeader = Util.formatString("algorithm=\"%s\"", algorithm);
+        String fieldsHeader = Util.formatString("headers=\"%s\"", fields);
 
-        String authorizationHeader = String.format("Signature %s,%s,%s,%s", secretIdHeader, signatureHeader, algorithmHeader, fieldsHeader);
+        String authorizationHeader = Util.formatString("Signature %s,%s,%s,%s", secretIdHeader, signatureHeader, algorithmHeader, fieldsHeader);
         getLogger().verbose("authorizationHeader: %s", authorizationHeader);
 
         return authorizationHeader;
diff --git a/Adjust/example/build.gradle b/Adjust/example/build.gradle
index eb8764232..02062f5a0 100644
--- a/Adjust/example/build.gradle
+++ b/Adjust/example/build.gradle
@@ -27,7 +27,7 @@ dependencies {
     // running mvn package
     //compile fileTree(dir: '../target', include: ['*.jar'])
     // using maven repository
-    //compile 'com.adjust.sdk:adjust-android:4.12.0'
+    //compile 'com.adjust.sdk:adjust-android:4.12.1'
 
     debugCompile 'com.squareup.leakcanary:leakcanary-android:1.5.4'
     releaseCompile 'com.squareup.leakcanary:leakcanary-android-no-op:1.5.4'
diff --git a/Adjust/pom.xml b/Adjust/pom.xml
index 9355f76da..a053727d0 100644
--- a/Adjust/pom.xml
+++ b/Adjust/pom.xml
@@ -5,7 +5,7 @@
     <modelVersion>4.0.0</modelVersion>
     <artifactId>adjust-android</artifactId>
     <groupId>com.adjust.sdk</groupId>
-    <version>4.12.0</version>
+    <version>4.12.1</version>
     <packaging>jar</packaging>
     <name>Adjust Android SDK</name>
     <url>https://github.com/adjust/android_sdk</url>
diff --git a/Adjust/pom_criteo.xml b/Adjust/pom_criteo.xml
index 2997314b4..12e20c400 100644
--- a/Adjust/pom_criteo.xml
+++ b/Adjust/pom_criteo.xml
@@ -5,7 +5,7 @@
     <modelVersion>4.0.0</modelVersion>
     <artifactId>adjust-android-criteo</artifactId>
     <groupId>com.adjust.sdk</groupId>
-    <version>4.12.0</version>
+    <version>4.12.1</version>
     <packaging>jar</packaging>
     <name>Adjust Android SDK</name>
     <url>https://github.com/adjust/android_sdk</url>
diff --git a/Adjust/pom_sociomantic.xml b/Adjust/pom_sociomantic.xml
index 3c12538ca..b7f5aa0ca 100644
--- a/Adjust/pom_sociomantic.xml
+++ b/Adjust/pom_sociomantic.xml
@@ -5,7 +5,7 @@
     <modelVersion>4.0.0</modelVersion>
     <artifactId>adjust-android-sociomantic</artifactId>
     <groupId>com.adjust.sdk</groupId>
-    <version>4.12.0</version>
+    <version>4.12.1</version>
     <packaging>jar</packaging>
     <name>Adjust Android SDK</name>
     <url>https://github.com/adjust/android_sdk</url>
diff --git a/Adjust/pom_trademob.xml b/Adjust/pom_trademob.xml
index a8696be21..0eed38445 100644
--- a/Adjust/pom_trademob.xml
+++ b/Adjust/pom_trademob.xml
@@ -5,7 +5,7 @@
     <modelVersion>4.0.0</modelVersion>
     <artifactId>adjust-android-trademob</artifactId>
     <groupId>com.adjust.sdk</groupId>
-    <version>4.12.0</version>
+    <version>4.12.1</version>
     <packaging>jar</packaging>
     <name>Adjust Android SDK</name>
     <url>https://github.com/adjust/android_sdk</url>
diff --git a/Adjust/test/src/androidTest/java/com/adjust/sdk/TestActivityPackage.java b/Adjust/test/src/androidTest/java/com/adjust/sdk/TestActivityPackage.java
index 852b795c7..4d5d18300 100644
--- a/Adjust/test/src/androidTest/java/com/adjust/sdk/TestActivityPackage.java
+++ b/Adjust/test/src/androidTest/java/com/adjust/sdk/TestActivityPackage.java
@@ -53,7 +53,7 @@ public TestActivityPackage(ActivityPackage activityPackage) {
         // default values
         appToken = "123456789012";
         environment = "sandbox";
-        clientSdk = "android4.12.0";
+        clientSdk = "android4.12.1";
         suffix = "";
         attribution = new AdjustAttribution();
         playServices = true;
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7799674f2..32a2f7eaa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+### Version 4.12.1 (31st January 2018)
+#### Fixed
+- Formatting all strings with US locale.
+
+---
+
 ### Version 4.12.0 (13th December 2017)
 #### Added
 - Added support for new Google referrer API (https://developer.android.com/google/play/installreferrer/library.html).
diff --git a/README.md b/README.md
index c732ff240..176231718 100644
--- a/README.md
+++ b/README.md
@@ -72,14 +72,14 @@ These are the minimal steps required to integrate the Adjust SDK into your Andro
 If you are using Maven, add the following to your `build.gradle` file:
 
 ```
-compile 'com.adjust.sdk:adjust-android:4.12.0'
+compile 'com.adjust.sdk:adjust-android:4.12.1'
 compile 'com.android.installreferrer:installreferrer:1.0'
 ```
 
 **Note**: If you are using `Gradle 3.0.0 or above`, make sure to use the `implementation` keyword instead of `compile` as follows:
 
 ```
-implementation 'com.adjust.sdk:adjust-android:4.12.0'
+implementation 'com.adjust.sdk:adjust-android:4.12.1'
 implementation 'com.android.installreferrer:installreferrer:1.0'
 ```
 
@@ -184,7 +184,7 @@ Also, make sure that you have paid attention to the [Proguard settings](#sdk-pro
 -keep public class com.android.installreferrer.** { *; }
 ```
 
-This feature is supported if you are using **Adjust SDK v4.12.0 or above**.
+This feature is supported if you are using **Adjust SDK v4.12.1 or above**.
 
 #### <a id="gps-intent"></a>Google Play Store intent
 
diff --git a/VERSION b/VERSION
index 815588ef1..53cf85e17 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-4.12.0
+4.12.1
diff --git a/doc/english/criteo_plugin.md b/doc/english/criteo_plugin.md
index 5a2d2c732..28154faab 100644
--- a/doc/english/criteo_plugin.md
+++ b/doc/english/criteo_plugin.md
@@ -3,7 +3,7 @@
 Add the dependency of the adjust sdk with the Criteo plugin:
 
 ```
-compile 'com.adjust.sdk:adjust-android-criteo:4.12.0'
+compile 'com.adjust.sdk:adjust-android-criteo:4.12.1'
 ```
 
 Or integrate adjust with Criteo events by following these steps:
diff --git a/doc/english/migrate.md b/doc/english/migrate.md
index 80c764291..758514918 100644
--- a/doc/english/migrate.md
+++ b/doc/english/migrate.md
@@ -1,4 +1,4 @@
-## Migrate your adjust SDK for Android to 4.12.0 from 3.6.2
+## Migrate your adjust SDK for Android to 4.12.1 from 3.6.2
 
 ### The Application class
 
diff --git a/doc/english/sociomantic_plugin.md b/doc/english/sociomantic_plugin.md
index 451f712c6..2c2c16fa1 100644
--- a/doc/english/sociomantic_plugin.md
+++ b/doc/english/sociomantic_plugin.md
@@ -3,7 +3,7 @@
 Add the dependency of the adjust sdk with the Sociomantic plugin:
 
 ```
-compile 'com.adjust.sdk:adjust-android-sociomantic:4.12.0'
+compile 'com.adjust.sdk:adjust-android-sociomantic:4.12.1'
 ```
 
 Or integrate adjust with Sociomantic events by following these steps:
diff --git a/doc/english/trademob_plugin.md b/doc/english/trademob_plugin.md
index 11a65acad..3a9c0900a 100644
--- a/doc/english/trademob_plugin.md
+++ b/doc/english/trademob_plugin.md
@@ -3,7 +3,7 @@
 Add the dependency of the adjust sdk with the Trademob plugin:
 
 ```
-compile 'com.adjust.sdk:adjust-android-trademob:4.12.0'
+compile 'com.adjust.sdk:adjust-android-trademob:4.12.1'
 ```
 
 Or integrate adjust with Trademob events by following these steps: