diff --git a/CHANGELOG.md b/CHANGELOG.md
index c3909a2..201d816 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,2 +1,3 @@
+- V 0.3.0: Added more programming languages: Java, Julia, C#, Ruby, Processing
 - V 0.2.0: Some small changes to NASSA.yml field checks, some general refactoring and added checks if files/dirs referenced in the .yml file actually exist
 - V 0.1.0: First prototype for a representative selection of variables in NASSA.yml files
\ No newline at end of file
diff --git a/nassa.cabal b/nassa.cabal
index b0c2a9d..5356fbb 100644
--- a/nassa.cabal
+++ b/nassa.cabal
@@ -1,5 +1,5 @@
 name:                nassa
-version:             0.2.0
+version:             0.3.0
 synopsis:            A package to validate NASSA modules
 description:         NASSA maintains a library of agent-based-modelling algorithms in individual code modules. Each module is defined by a NASSA.yml file. nassa-hs validates these .yml files.
 license:             MIT
diff --git a/src/NASSA/Types.hs b/src/NASSA/Types.hs
index c494890..9cae4f7 100644
--- a/src/NASSA/Types.hs
+++ b/src/NASSA/Types.hs
@@ -138,19 +138,34 @@ data ProgrammingLanguage =
       LanguageR 
     | LanguagePython
     | LanguageNetLogo
+    | LanguageJava
+    | LanguageJulia
+    | LanguageCsharp
+    | LanguageRuby
+    | LanguageProcessing
     deriving (Eq)
 
 instance Show ProgrammingLanguage where
     show LanguageR = "R"
     show LanguagePython = "Python"
     show LanguageNetLogo = "NetLogo"
+    show LanguageJava = "Java"
+    show LanguageJulia = "Julia"
+    show LanguageCsharp = "C#"
+    show LanguageRuby = "Ruby"
+    show LanguageProcessing = "Processing"
 
 instance FromJSON ProgrammingLanguage where
     parseJSON = withText "programmingLanguage" $ \case
-        "R"         -> pure LanguageR
-        "Python"    -> pure LanguagePython
-        "NetLogo"   -> pure LanguageNetLogo
-        other       -> fail $ "unknown Language: " ++ show other
+        "R"            -> pure LanguageR
+        "Python"       -> pure LanguagePython
+        "NetLogo"      -> pure LanguageNetLogo
+        "Java"         -> pure LanguageJava
+        "Julia"        -> pure LanguageJulia
+        "C#"           -> pure LanguageCsharp
+        "Ruby"         -> pure LanguageRuby
+        "Processing"   -> pure LanguageProcessing
+        other          -> fail $ "unknown Language: " ++ show other
 
 data InOrOutput = InOrOutput
     { _inOrOutputName :: String