diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# Version [0.6.0.1](https://github.com/blockfrost/blockfrost-haskell/compare/v0.6.0.0...client-core-0.6.0.1) (2024-01-16)
+
+* Allow servant `0.20`
+
 # Version [0.6.0.0](https://github.com/blockfrost/blockfrost-haskell/compare/v0.5.0.0...v0.6.0.0) (2022-08-31)
 
 * Additions
diff --git a/blockfrost-client-core.cabal b/blockfrost-client-core.cabal
--- a/blockfrost-client-core.cabal
+++ b/blockfrost-client-core.cabal
@@ -1,6 +1,6 @@
 cabal-version:       2.2
 name:                blockfrost-client-core
-version:             0.6.0.0
+version:             0.6.0.1
 synopsis:            blockfrost.io common client definitions / instances
 description:         HasClient for our auth
 homepage:            https://github.com/blockfrost/blockfrost-haskell
@@ -53,7 +53,7 @@
                       , http-client
                       , http-client-tls
                       , http-types
-                      , servant                  >= 0.18 && < 0.20
+                      , servant                  >= 0.18 && < 0.21
                       , servant-client
                       , servant-client-core
                       , servant-multipart-api
diff --git a/src/Blockfrost/Client/Core.hs b/src/Blockfrost/Client/Core.hs
--- a/src/Blockfrost/Client/Core.hs
+++ b/src/Blockfrost/Client/Core.hs
@@ -69,6 +69,7 @@
 subdomainByEnv Testnet   = pure "cardano-testnet"
 subdomainByEnv Preprod   = pure "cardano-preprod"
 subdomainByEnv Preview   = pure "cardano-preview"
+subdomainByEnv Sanchonet = pure "cardano-sanchonet"
 subdomainByEnv Localhost = Nothing
 
 -- | Read file according to BLOCKFROST_TOKEN_PATH environment variable name.