diff --git a/build.gradle b/build.gradle
index 830f2f2b9..879e374e3 100644
--- a/build.gradle
+++ b/build.gradle
@@ -88,7 +88,7 @@ dependencies {
     cliImplementation 'com.github.stefanhaustein:kxml2:2.4.1'
     cliImplementation 'commons-cli:commons-cli:1.3.1'
     cliImplementation 'joda-time:joda-time:2.9.4'
-    cliImplementation 'io.reactivex.rxjava2:rxjava:2.1.1'
+    cliImplementation 'io.reactivex.rxjava2:rxjava:2.2.21'
     cliImplementation 'com.squareup.retrofit2:retrofit:2.3.0'
     cliImplementation 'com.squareup.okhttp3:okhttp:4.4.1'
     cliImplementation 'com.google.guava:guava:31.1-jre'
@@ -112,7 +112,7 @@ dependencies {
     ccapiImplementation 'com.github.stefanhaustein:kxml2:2.4.1'
     ccapiImplementation 'joda-time:joda-time:2.9.4'
     ccapiImplementation 'com.carrotsearch:hppc:0.9.1'
-    ccapiImplementation 'io.reactivex.rxjava2:rxjava:2.1.1'
+    ccapiImplementation 'io.reactivex.rxjava2:rxjava:2.2.21'
     ccapiImplementation "com.squareup.retrofit2:retrofit:2.3.0"
     ccapiImplementation 'com.squareup.okhttp3:okhttp:4.4.1'
     ccapiImplementation 'com.google.guava:guava:31.1-jre'
@@ -126,7 +126,7 @@ dependencies {
     translateImplementation files('lib/json-simple-1.1.1.jar')
     translateImplementation 'joda-time:joda-time:2.9.4'
     translateImplementation 'org.json:json:20140107'
-    translateImplementation 'io.reactivex.rxjava2:rxjava:2.1.1'
+    translateImplementation 'io.reactivex.rxjava2:rxjava:2.2.21'
     translateImplementation "com.squareup.retrofit2:retrofit:2.3.0"
     translateImplementation 'com.squareup.okhttp3:okhttp:4.4.1'
     translateImplementation 'com.google.guava:guava:31.1-jre'