diff --git a/build.gradle b/build.gradle
index 8796658b173..a88052930d2 100644
--- a/build.gradle
+++ b/build.gradle
@@ -16,7 +16,7 @@ buildscript {
 
 plugins {
     id 'com.gradle.build-scan' version '1.16'
-    id 'com.install4j.gradle' version '7.0.7'
+    id 'com.install4j.gradle' version '7.0.8'
     id 'com.github.johnrengelman.shadow' version '2.0.4'
     id "de.sebastianboegl.shadow.transformer.log4j" version "2.1.1"
     id "com.simonharrer.modernizer" version '1.6.0-1'
@@ -119,13 +119,13 @@ dependencies {
     antlr4 'org.antlr:antlr4:4.7.1'
     compile 'org.antlr:antlr4-runtime:4.7.1'
 
-    compile 'mysql:mysql-connector-java:8.0.12'
+    compile 'mysql:mysql-connector-java:8.0.13'
 
     compile 'org.postgresql:postgresql:42.2.5'
 
     compile 'net.java.dev.glazedlists:glazedlists_java15:1.9.1'
 
-    compile 'com.google.guava:guava:26.0-jre'
+    compile 'com.google.guava:guava:27.0-jre'
 
     // JavaFX stuff
     compile 'de.jensd:fontawesomefx-materialdesignfont:1.7.22-4'
@@ -182,7 +182,7 @@ dependencies {
     testCompile "org.testfx:testfx-core:4.0.+"
     testCompile "org.testfx:testfx-junit5:4.0.+"
 
-    checkstyle 'com.puppycrawl.tools:checkstyle:8.13'
+    checkstyle 'com.puppycrawl.tools:checkstyle:8.14'
 }
 
 jacoco {
@@ -204,6 +204,11 @@ dependencyUpdates.resolutionStrategy = {
                 selection.reject("Ignore SNAPSHOT releases")
             }
         }
+        rules.withModule("com.gradle.build-scan:com.gradle.build-scan.gradle.plugin") { ComponentSelection selection ->
+            if (selection.candidate.version ==~ /2.*/) {
+                selection.reject("Cannot be upgraded to version 2 until we upgrade to gradle 5")
+            }
+        }
         rules.withModule("org.controlsfx:controlsfx") { ComponentSelection selection ->
             if (selection.candidate.version ==~ /9.*/) { // Reject version 9 or higher
                 selection.reject("Cannot be updated to 9.*.* until Jabref works with Java 9")
@@ -216,8 +221,8 @@ dependencyUpdates.resolutionStrategy = {
             }
         }
         rules.withModule("com.github.johnrengelman.shadow:com.github.johnrengelman.shadow.gradle.plugin") { ComponentSelection selection ->
-            if (selection.candidate.version == /4.0.1/) {
-                selection.reject("Version 4.0.1 breaks the release process.")
+            if (selection.candidate.version ==~ /4.*/) {
+                selection.reject("Version 4.X breaks the release process.")
             }
         }
         rules.withModule("de.jensd:fontawesomefx-materialdesignfont") { ComponentSelection selection ->