diff --git a/Cargo.toml b/Cargo.toml
index fc1bc3f..41d38f1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "schema_registry_converter"
-version = "3.1.0"
+version = "4.0.0"
 authors = ["Gerard Klijs <g.klijs@gmail.com>"]
 include = ["src/**/*", "Cargo.toml"]
 description = "Encode/decode data from/to kafka using the Confluent Schema Registry"
diff --git a/README.md b/README.md
index 5b00e0d..4d4055e 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,7 @@ To use it to convert using avro async use:
 
 ```toml
 [dependencies]
-schema_registry_converter = { version = "3.1.0", features = ["avro"] }
+schema_registry_converter = { version = "4.0.0", features = ["avro"] }
 ```
 
 For simplicity there are `easy` variants that internally have an arc.
@@ -44,7 +44,7 @@ structs that start with `Easy` in the name to do the conversions.
 
 ```toml
 [dependencies]
-schema_registry_converter = { version = "3.1.0", features = ["easy", "avro"] }
+schema_registry_converter = { version = "4.0.0", features = ["easy", "avro"] }
 ```
 
 ...and see the [docs](https://docs.rs/schema_registry_converter) for how to use it.
@@ -53,7 +53,7 @@ All the converters also have a blocking (non async) version, in that case use so
 
 ```toml
 [dependencies]
-schema_registry_converter = { version = "3.1.0", default-features = false, features = ["avro", "blocking"] }
+schema_registry_converter = { version = "4.0.0", default-features = false, features = ["avro", "blocking"] }
 ```
 
 If you need to use both in a project you can use something like, but have to be weary you import the correct paths
@@ -61,7 +61,7 @@ depending on your use.
 
 ```toml
 [dependencies]
-schema_registry_converter = { version = "3.1.0", features = ["avro", "blocking"] }
+schema_registry_converter = { version = "4.0.0", features = ["avro", "blocking"] }
 ```
 
 ## Consumer
diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index 8a65269..ba1db95 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -1,5 +1,11 @@
 ## Release notes
 
+### 4.0.0
+
+Opened up/added some functionality.
+Updated versions.
+Simplified the SubjectNameStrategy enum.
+
 ### 3.1.0
 
 Fix a problem with missing checks on some proto common types, like timestamp.
@@ -89,8 +95,11 @@ instead of the `encode` function on the encoder.
 #### Contributors
 
 - [@cbzehner](https://github.com/cbzehner)
-- [@j-halbert](https://github.com/j-halbert)  
+- [@johnhalbert](https://github.com/johnhalbert)  
 - [@kitsuneninetails](https://github.com/kitsuneninetails)
+- [@kujeger](https://github.com/kujeger)
+- [@Licenser](https://github.com/Licenser)
+- [@marioloko](https://github.com/marioloko)
 - [@naamancurtis](https://github.com/naamancurtis)
 - [@MariellHoversholm-Paf](https://github.com/MariellHoversholm-Paf)
 - [@SergeStrashko](https://github.com/SergeStrashko)
\ No newline at end of file