diff --git a/README.md b/README.md
index 608085a..fb6acb3 100644
--- a/README.md
+++ b/README.md
@@ -18,29 +18,21 @@ You would use custom scalars when you want to describe more meaningful behavior
 ## How to install
 To use this library put the following into your gradle config
 
-    implementation 'com.graphql-java:graphql-java-extended-scalars:19.0'
+    implementation 'com.graphql-java:graphql-java-extended-scalars:20.0'
     
 or the following into your Maven config
 
     <dependency>
       <groupId>com.graphql-java</groupId>
       <artifactId>graphql-java-extended-scalars</artifactId>
-      <version>19.0</version>
+      <version>20.0</version>
     </dependency>
 
 > Note:
 >
-> use 1.0.1 or above for graphql-java 14.x and above
->
-> use 15.0.0 or above for graphql-java 15.x and above
->
-> use 16.0.0 or above for graphql-java 16.x and above
->
-> use 17.0 or above for graphql-java 17.x and above
-> 
-> use 18.0 or above for graphql-java 18.x and above
->
 > use 19.0 or above for graphql-java 19.x and above
+> 
+> use 20.0 or above for graphql-java 20.x and above
 
 
 It's currently available from Maven Central.
diff --git a/build.gradle b/build.gradle
index 119b8f0..06917fc 100644
--- a/build.gradle
+++ b/build.gradle
@@ -47,7 +47,7 @@ repositories {
 
 
 dependencies {
-    compile "com.graphql-java:graphql-java:19.2"
+    compile "com.graphql-java:graphql-java:20.0"
 
     testImplementation 'org.spockframework:spock-core:1.3-groovy-2.5'
     testImplementation('org.codehaus.groovy:groovy:2.5.13')
diff --git a/src/main/java/graphql/scalars/datetime/DateTimeScalar.java b/src/main/java/graphql/scalars/datetime/DateTimeScalar.java
index ef52333..12b01de 100644
--- a/src/main/java/graphql/scalars/datetime/DateTimeScalar.java
+++ b/src/main/java/graphql/scalars/datetime/DateTimeScalar.java
@@ -110,7 +110,7 @@ private OffsetDateTime parseOffsetDateTime(String s, Function<String, RuntimeExc
         INSTANCE = GraphQLScalarType.newScalar()
                 .name("DateTime")
                 .description("A slightly refined version of RFC-3339 compliant DateTime Scalar")
-                .specifiedByUrl("https://scalars.graphql.org/andimarek/date-time") // TODO: Change to .specifiedByURL after release of graphql-java v20
+                .specifiedByUrl("https://scalars.graphql.org/andimarek/date-time") // TODO: Change to .specifiedByURL when builder added to graphql-java
                 .coercing(coercing)
                 .build();
     }