diff --git a/src/protocol/initialize.jl b/src/protocol/initialize.jl
index 62d204df..8083c555 100644
--- a/src/protocol/initialize.jl
+++ b/src/protocol/initialize.jl
@@ -54,6 +54,38 @@ end
     versionSupport::Union{Bool,Missing}
 end
 
+@dict_readable struct SemanticTokensClientCapabilitiesRequestsFull <: Outbound
+    delta::Union{Bool,Missing}
+end
+
+struct SemanticTokensClientCapabilitiesRequests <: Outbound
+    range::Union{Bool,Missing}
+    full::Union{Bool,Missing,SemanticTokensClientCapabilitiesRequestsFull}
+end
+
+# Requires handwritten implementaiton to account for 3-part Unions
+function SemanticTokensClientCapabilitiesRequests(dict::Dict)
+    range = get(dict, "range", missing)
+    full = get(dict, "full", missing)
+    if full isa Dict
+        full = SemanticTokensClientCapabilitiesRequestsFull(full)
+    end
+
+    return SemanticTokensClientCapabilitiesRequests(range, full)
+end
+
+@dict_readable struct SemanticTokensClientCapabilities
+    dynamicRegistration::Union{Bool,Missing}
+    requests::SemanticTokensClientCapabilitiesRequests
+    tokenTypes::Vector{String}
+    tokenModifiers::Vector{String}
+    formats::Vector{String}
+    overlappingTokenSupport::Union{Bool,Missing}
+    multilineTokenSupport::Union{Bool,Missing}
+    serverCancelSupport::Union{Bool,Missing}
+    augmentsSyntaxTokens::Union{Bool,Missing}
+end
+
 @dict_readable struct TextDocumentClientCapabilities <: Outbound
     synchronization::Union{TextDocumentSyncClientCapabilities,Missing}
     completion::Union{CompletionClientCapabilities,Missing}
@@ -77,6 +109,7 @@ end
     publishDiagnostics::Union{PublishDiagnosticsClientCapabilities,Missing}
     foldingRange::Union{FoldingRangeClientCapabilities,Missing}
     selectionRange::Union{SelectionRangeClientCapabilities,Missing}
+    semanticTokens::Union{SemanticTokensClientCapabilities,Missing}
 end
 
 @dict_readable struct WindowClientCapabilities <: Outbound
diff --git a/test/test_shared_init_request.jl b/test/test_shared_init_request.jl
index 358df0d9..e86e73cc 100644
--- a/test/test_shared_init_request.jl
+++ b/test/test_shared_init_request.jl
@@ -40,6 +40,7 @@ init_request = LanguageServer.InitializeParams(
                 missing, # PublishDiagnosticsClientCapabilities(),
                 missing, # FoldingRangeClientCapabilities(),
                 missing, # SelectionRangeClientCapabilities()
+                missing, # SemanticTokensClientCapabilities()
             ),
             missing,
             missing