diff --git a/crdt-enc-gpgme/Cargo.toml b/crdt-enc-gpgme/Cargo.toml
index c2681ba..1b20692 100644
--- a/crdt-enc-gpgme/Cargo.toml
+++ b/crdt-enc-gpgme/Cargo.toml
@@ -14,6 +14,7 @@ uuid = "0.8"
 crdts = "6.2"
 gpgme = "0.9"
 dyn-clone = "1"
+phf = {version = "0.8", features = ["macros"]}
 
 [dependencies.crdt-enc]
 path = "../crdt-enc"
diff --git a/crdt-enc-gpgme/src/lib.rs b/crdt-enc-gpgme/src/lib.rs
index c9cceae..46f6721 100644
--- a/crdt-enc-gpgme/src/lib.rs
+++ b/crdt-enc-gpgme/src/lib.rs
@@ -3,7 +3,8 @@ use ::async_trait::async_trait;
 use ::crdt_enc::{
     key_cryptor::Keys,
     utils::{
-        decode_version_bytes_mvreg_custom, encode_version_bytes_mvreg_custom, LockBox, VersionBytes,
+        decode_version_bytes_mvreg_custom_phf, encode_version_bytes_mvreg_custom, LockBox,
+        VersionBytes,
     },
     CoreSubHandle, Info,
 };
@@ -14,10 +15,10 @@ use ::uuid::Uuid;
 
 const CURRENT_VERSION: Uuid = Uuid::from_u128(0xe69cb68e_7fbb_41aa_8d22_87eace7a04c9);
 
-// needs to be sorted!
-const SUPPORTED_VERSIONS: &[Uuid] = &[
-    Uuid::from_u128(0xe69cb68e_7fbb_41aa_8d22_87eace7a04c9), // current
-];
+static SUPPORTED_VERSIONS: phf::Set<u128> = phf::phf_set! {
+    // current
+    0x_e69cb68e_7fbb_41aa_8d22_87eace7a04c9_u128,
+};
 
 pub fn init() {
     gpgme::init();
@@ -88,12 +89,15 @@ impl crdt_enc::key_cryptor::KeyCryptor for KeyHandler {
             Ok((data.remote_meta.clone(), core))
         })?;
 
-        let keys_ctx =
-            decode_version_bytes_mvreg_custom(&remote_meta, SUPPORTED_VERSIONS, |buf| async move {
+        let keys_ctx = decode_version_bytes_mvreg_custom_phf(
+            &remote_meta,
+            &SUPPORTED_VERSIONS,
+            |buf| async move {
                 // TODO: decrypt key
                 Ok(buf)
-            })
-            .await?;
+            },
+        )
+        .await?;
 
         core.set_keys(keys_ctx).await?;
 
diff --git a/crdt-enc/Cargo.toml b/crdt-enc/Cargo.toml
index 48a6732..02c6679 100644
--- a/crdt-enc/Cargo.toml
+++ b/crdt-enc/Cargo.toml
@@ -15,6 +15,7 @@ thiserror = "1"
 futures = "0.3"
 dyn-clone = "1"
 bytes = "1"
+phf = {version = "0.8", features = ["macros"]}
 
 [dependencies.uuid]
 version = "0.8"
diff --git a/crdt-enc/src/lib.rs b/crdt-enc/src/lib.rs
index 110a906..487503e 100644
--- a/crdt-enc/src/lib.rs
+++ b/crdt-enc/src/lib.rs
@@ -25,10 +25,10 @@ use ::uuid::Uuid;
 
 const CURRENT_VERSION: Uuid = Uuid::from_u128(0xe834d789_101b_4634_9823_9de990a9051f);
 
-// needs to be sorted!
-const SUPPORTED_VERSIONS: &[Uuid] = &[
-    Uuid::from_u128(0xe834d789_101b_4634_9823_9de990a9051f), // current
-];
+static SUPPORTED_VERSIONS: phf::Set<u128> = phf::phf_set! {
+    // current
+    0x_e834d789_101b_4634_9823_9de990a9051f_u128,
+};
 
 #[async_trait]
 pub trait CoreSubHandle
@@ -254,7 +254,7 @@ where
             .context("failed getting local meta")?;
         let local_meta: LocalMeta = match local_meta {
             Some(local_meta) => {
-                local_meta.ensure_versions(SUPPORTED_VERSIONS)?;
+                local_meta.ensure_versions_phf(&SUPPORTED_VERSIONS)?;
                 rmp_serde::from_read_ref(&local_meta)?
             }
             None => {
@@ -432,7 +432,7 @@ where
             .map(|(name, state)| {
                 let key = key.clone();
                 async move {
-                    state.ensure_versions(SUPPORTED_VERSIONS)?;
+                    state.ensure_versions_phf(&SUPPORTED_VERSIONS)?;
 
                     let clear_text = self
                         .cryptor
@@ -497,7 +497,7 @@ where
             .map(|(actor, version, data)| {
                 let key = key.clone();
                 async move {
-                    data.ensure_versions(SUPPORTED_VERSIONS)?;
+                    data.ensure_versions_phf(&SUPPORTED_VERSIONS)?;
                     let clear_text = self
                         .cryptor
                         .decrypt(key.key(), data.into_inner())
@@ -575,7 +575,7 @@ where
             .context("failed loading remote meta while reading remote metas")?
             .into_iter()
             .map(|(name, vbox)| {
-                vbox.ensure_versions(SUPPORTED_VERSIONS)?;
+                vbox.ensure_versions_phf(&SUPPORTED_VERSIONS)?;
 
                 let remote_meta: RemoteMeta = rmp_serde::from_read_ref(&vbox)?;
 
diff --git a/crdt-enc/src/utils.rs b/crdt-enc/src/utils.rs
index 46edea4..e1b6107 100644
--- a/crdt-enc/src/utils.rs
+++ b/crdt-enc/src/utils.rs
@@ -55,6 +55,7 @@ pub fn decode_version_bytes_mvreg<T: DeserializeOwned + CvRDT + Default>(
     })
 }
 
+/// `supported_versions` needs to be sorted
 pub async fn decode_version_bytes_mvreg_custom<T, M, Fut>(
     reg: &MVReg<VersionBytes, Uuid>,
     supported_versions: &[Uuid],
@@ -89,6 +90,40 @@ where
     })
 }
 
+pub async fn decode_version_bytes_mvreg_custom_phf<T, M, Fut>(
+    reg: &MVReg<VersionBytes, Uuid>,
+    supported_versions: &phf::Set<u128>,
+    mut buf_decode: M,
+) -> Result<ReadCtx<T, Uuid>>
+where
+    T: DeserializeOwned + CvRDT + Default,
+    M: FnMut(Vec<u8>) -> Fut,
+    Fut: Future<Output = Result<Vec<u8>>>,
+{
+    let (vals, read_ctx) = reg.read().split();
+    let val = stream::iter(vals)
+        .map(|vb| {
+            vb.ensure_versions_phf(supported_versions)?;
+            Ok(vb.into_inner())
+        })
+        .map_ok(|buf| {
+            buf_decode(buf).map(|res| res.context("Custom buffer decode function failed"))
+        })
+        .try_buffer_unordered(16)
+        .try_fold(T::default(), |mut acc, buf| async move {
+            let keys = rmp_serde::from_read_ref(&buf).context("Could not parse msgpack value")?;
+            acc.merge(keys);
+            Ok(acc)
+        })
+        .await
+        .context("Could not process mvreg value")?;
+    Ok(ReadCtx {
+        add_clock: read_ctx.add_clock,
+        rm_clock: read_ctx.rm_clock,
+        val,
+    })
+}
+
 pub fn encode_version_bytes_mvreg<T: Serialize>(
     reg: &mut MVReg<VersionBytes, Uuid>,
     val: ReadCtx<T, Uuid>,
diff --git a/crdt-enc/src/utils/version_bytes.rs b/crdt-enc/src/utils/version_bytes.rs
index 513bc8e..326b482 100644
--- a/crdt-enc/src/utils/version_bytes.rs
+++ b/crdt-enc/src/utils/version_bytes.rs
@@ -49,6 +49,10 @@ impl VersionBytes {
         self.as_version_bytes_ref().ensure_versions(versions)
     }
 
+    pub fn ensure_versions_phf(&self, versions: &phf::Set<u128>) -> Result<(), VersionError> {
+        self.as_version_bytes_ref().ensure_versions_phf(versions)
+    }
+
     pub fn into_inner(self) -> Vec<u8> {
         self.1
     }
@@ -128,6 +132,21 @@ impl<'a> VersionBytesRef<'a> {
         }
     }
 
+    pub fn ensure_versions_phf(&self, versions: &phf::Set<u128>) -> Result<(), VersionError> {
+        if versions.contains(&self.version().as_u128()) {
+            Ok(())
+        } else {
+            Err(VersionError {
+                expected: versions
+                    .iter()
+                    .copied()
+                    .map(|v| Uuid::from_u128(v))
+                    .collect(),
+                got: self.0,
+            })
+        }
+    }
+
     pub fn buf(&self) -> VersionBytesBuf<'_> {
         VersionBytesBuf::new(self.0, &self.1)
     }