diff --git a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/lms/impl/olat/OlatLmsRestTemplate.java b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/lms/impl/olat/OlatLmsRestTemplate.java
index 6c326124..4e759384 100644
--- a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/lms/impl/olat/OlatLmsRestTemplate.java
+++ b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/lms/impl/olat/OlatLmsRestTemplate.java
@@ -12,6 +12,7 @@ import java.io.IOException;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import org.springframework.http.HttpEntity;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpRequest;
 import org.springframework.http.HttpStatus;
@@ -66,12 +67,16 @@ public class OlatLmsRestTemplate extends RestTemplate {
     private void authenticate() {
         // Authenticate with OLAT and store the received X-OLAT-TOKEN
         this.token = "authenticating";
-        final String authUrl = String.format("%s%s?password=%s",
-                this.details.getAccessTokenUri(),
+        final String authUrl = this.details.getAccessTokenUri();
+        final String credentials = String.format(
+                "{\"username\": \"%s\", \"password\": \"%s\"}",
                 this.details.getClientId(),
                 this.details.getClientSecret());
+        final HttpHeaders httpHeaders = new HttpHeaders();
+        httpHeaders.set("content-type", "application/json");
+        final HttpEntity<String> requestEntity = new HttpEntity<>(credentials, httpHeaders);
         try {
-            final ResponseEntity<String> response = this.getForEntity(authUrl, String.class);
+            final ResponseEntity<String> response = this.postForEntity(authUrl, requestEntity, String.class);
             final HttpHeaders responseHeaders = response.getHeaders();
             log.debug("OLAT [authenticate] {} Headers: {}", response.getStatusCode(), responseHeaders);
             this.token = responseHeaders.getFirst("X-OLAT-TOKEN");