diff --git a/Cargo.lock b/Cargo.lock
index 1404b618f..2715ced0a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1575,7 +1575,7 @@ dependencies = [
 [[package]]
 name = "stellar-xdr"
 version = "22.0.0"
-source = "git+https://github.com/stellar/rs-stellar-xdr?rev=550743b50cd3ca5a63f03f9d7175b4cfdfd9c4ac#550743b50cd3ca5a63f03f9d7175b4cfdfd9c4ac"
+source = "git+https://github.com/stellar/rs-stellar-xdr?rev=39d7dbb0c12bd422ee43a6e2e3277789da4eaac8#39d7dbb0c12bd422ee43a6e2e3277789da4eaac8"
 dependencies = [
  "arbitrary",
  "base64 0.13.1",
diff --git a/Cargo.toml b/Cargo.toml
index 4d8449e34..82ab4d2b1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -36,7 +36,7 @@ wasmparser = "=0.116.1"
 [workspace.dependencies.stellar-xdr]
 version = "=22.0.0"
 git = "https://github.com/stellar/rs-stellar-xdr"
-rev = "550743b50cd3ca5a63f03f9d7175b4cfdfd9c4ac"
+rev = "39d7dbb0c12bd422ee43a6e2e3277789da4eaac8"
 default-features = false
 
 [workspace.dependencies.wasmi]
diff --git a/soroban-env-common/src/lib.rs b/soroban-env-common/src/lib.rs
index 937ee9fee..9ff21e563 100644
--- a/soroban-env-common/src/lib.rs
+++ b/soroban-env-common/src/lib.rs
@@ -45,7 +45,7 @@ macro_rules! tracy_span {
 pub struct Version<'a> {
     pub pkg: &'a str,
     pub rev: &'a str,
-    pub interface: u64,
+    pub interface: xdr::ScEnvMetaEntryInterfaceVersion,
     pub xdr: stellar_xdr::Version<'a>,
 }
 
diff --git a/soroban-env-common/src/meta.rs b/soroban-env-common/src/meta.rs
index 9a0783ea1..f79d53854 100644
--- a/soroban-env-common/src/meta.rs
+++ b/soroban-env-common/src/meta.rs
@@ -5,13 +5,13 @@
 //! [Env](crate::Env) interface provided by the host, rather than a cryptic failure
 //! due to a runtime host function signature mismatch.
 
-// Currently the only constant is `INTERFACE_VERSION` which is a u64 with a low
-// and high component. The low component is a pre-release version which should
-// be zero any time you make a real release, and the high component is the
-// ledger version / protocol version (the two terms are used interchangably in
-// the stellar codebase), which should both match the major release version of
-// soroban and the major release version of stellar-core that it's embedded
-// within.
+// Currently the only constant is `INTERFACE_VERSION` which is a struct
+// containing a 32-bit protocol version and 32-bit pre-release version. The
+// pre-release version should be zero any time you make a real release, and the
+// protocol version is the ledger version / protocol version (the two terms are
+// used interchangably in the stellar codebase), which should both match the
+// major release version of soroban and the major release version of
+// stellar-core that it's embedded within.
 //
 // Protocol numbers will be checked for ordered compatibility (a host will only
 // run contracts built for same-or-older protocol versions than its own) whereas
@@ -38,6 +38,8 @@
 // nonzero pre-release number can be used to force recompiles on interface
 // changes.
 
+use crate::xdr::ScEnvMetaEntryInterfaceVersion;
+
 pub const ENV_META_V0_SECTION_NAME: &str = "contractenvmetav0";
 
 // If the "next" feature is enabled, we're building from the "next" xdr
@@ -60,17 +62,3 @@ soroban_env_macros::generate_env_meta_consts!(
     ledger_protocol_version: 22,
     pre_release_version: 0,
 );
-
-pub const fn make_interface_version(protocol_version: u32, pre_release_version: u32) -> u64 {
-    ((protocol_version as u64) << 32) | (pre_release_version as u64)
-}
-
-pub const fn get_ledger_protocol_version(interface_version: u64) -> u32 {
-    // The ledger protocol version is the high 32 bits of INTERFACE_VERSION
-    (interface_version >> 32) as u32
-}
-
-pub const fn get_pre_release_version(interface_version: u64) -> u32 {
-    // The pre-release version is the low 32 bits of INTERFACE_VERSION
-    interface_version as u32
-}
diff --git a/soroban-env-host/Cargo.toml b/soroban-env-host/Cargo.toml
index dee66a826..da1db8f61 100644
--- a/soroban-env-host/Cargo.toml
+++ b/soroban-env-host/Cargo.toml
@@ -100,7 +100,7 @@ p256 = {version = "0.13.2", default-features = false, features = ["alloc"]}
 [dev-dependencies.stellar-xdr]
 version = "=22.0.0"
 git = "https://github.com/stellar/rs-stellar-xdr"
-rev = "550743b50cd3ca5a63f03f9d7175b4cfdfd9c4ac"
+rev = "39d7dbb0c12bd422ee43a6e2e3277789da4eaac8"
 default-features = false
 features = ["arbitrary"]
 
diff --git a/soroban-env-host/src/host.rs b/soroban-env-host/src/host.rs
index 0a015e0cc..549c0aeb3 100644
--- a/soroban-env-host/src/host.rs
+++ b/soroban-env-host/src/host.rs
@@ -548,7 +548,7 @@ impl Host {
                 &[proto.into()],
             ));
         }
-        if proto > meta::get_ledger_protocol_version(meta::INTERFACE_VERSION) {
+        if proto > meta::INTERFACE_VERSION.protocol {
             return Err(self.err(
                 ScErrorType::Context,
                 ScErrorCode::InternalError,
diff --git a/soroban-env-host/src/test/hostile.rs b/soroban-env-host/src/test/hostile.rs
index 3552b2d5d..0981db11d 100644
--- a/soroban-env-host/src/test/hostile.rs
+++ b/soroban-env-host/src/test/hostile.rs
@@ -751,8 +751,7 @@ fn test_integer_overflow() -> Result<(), HostError> {
 
 #[test]
 fn test_corrupt_custom_section() -> Result<(), HostError> {
-    use crate::meta::make_interface_version;
-    use crate::xdr::{Limits, ScEnvMetaEntry, WriteXdr};
+    use crate::xdr::{Limits, ScEnvMetaEntry, ScEnvMetaEntryInterfaceVersion, WriteXdr};
 
     let host = observe_host!(Host::test_host_with_recording_footprint());
     host.enable_debug()?;
@@ -781,9 +780,12 @@ fn test_corrupt_custom_section() -> Result<(), HostError> {
     ));
 
     // invalid section name
-    let xdr = ScEnvMetaEntry::ScEnvMetaKindInterfaceVersion(make_interface_version(20, 0))
-        .to_xdr(Limits::none())
-        .unwrap();
+    let xdr = ScEnvMetaEntry::ScEnvMetaKindInterfaceVersion(ScEnvMetaEntryInterfaceVersion {
+        protocol: 20,
+        pre_release: 0,
+    })
+    .to_xdr(Limits::none())
+    .unwrap();
     let res = host.register_test_contract_wasm_from_source_account(
         wasm_util::wasm_module_with_custom_section("contractenvmetav1", &xdr).as_slice(),
         generate_account_id(&host),
@@ -828,7 +830,7 @@ fn test_corrupt_custom_section() -> Result<(), HostError> {
         ));
 
         // invalid: protocol is current but pre-release version doesn't match env's
-        let env_pre = meta::get_pre_release_version(meta::INTERFACE_VERSION);
+        let env_pre = meta::INTERFACE_VERSION.pre_release;
         let res = host.register_test_contract_wasm_from_source_account(
             wasm_util::wasm_module_with_custom_section(
                 "contractenvmetav0",
diff --git a/soroban-env-host/src/test/metering_benchmark.rs b/soroban-env-host/src/test/metering_benchmark.rs
index cf481df09..30d077371 100644
--- a/soroban-env-host/src/test/metering_benchmark.rs
+++ b/soroban-env-host/src/test/metering_benchmark.rs
@@ -21,7 +21,7 @@ use crate::testutils::{generate_account_id, generate_bytes_array};
 // RUST_TEST_THREADS=1  cargo test --release --package soroban-env-host --lib --features testutils -- test::metering_benchmark  --nocapture --ignored
 
 const LEDGER_INFO: LedgerInfo = LedgerInfo {
-    protocol_version: crate::meta::get_ledger_protocol_version(crate::meta::INTERFACE_VERSION),
+    protocol_version: crate::meta::INTERFACE_VERSION.protocol,
     sequence_number: 1234,
     timestamp: 1234,
     network_id: [7; 32],
diff --git a/soroban-env-host/src/test/protocol_gate.rs b/soroban-env-host/src/test/protocol_gate.rs
index 282a874b7..418398e1d 100644
--- a/soroban-env-host/src/test/protocol_gate.rs
+++ b/soroban-env-host/src/test/protocol_gate.rs
@@ -1,5 +1,5 @@
 use crate::{
-    meta::{get_ledger_protocol_version, INTERFACE_VERSION},
+    meta::INTERFACE_VERSION,
     testutils::{generate_account_id, generate_bytes_array, wasm as wasm_util},
     xdr::{ScErrorCode, ScErrorType},
     AddressObject, Env, Host, HostError, LedgerInfo, Symbol, Val, WasmiMarshal,
@@ -9,7 +9,7 @@ use crate::{
 fn ledger_protocol_greater_than_env_protocol_should_fail() -> Result<(), HostError> {
     let host = Host::test_host_with_recording_footprint();
     host.enable_debug()?;
-    let env_proto = get_ledger_protocol_version(INTERFACE_VERSION);
+    let env_proto = INTERFACE_VERSION.protocol;
 
     // This test only makes sense if TEST_PROTOCOL is equal to the env version
     if env_proto != host.get_ledger_protocol_version()? {
diff --git a/soroban-env-host/src/testutils.rs b/soroban-env-host/src/testutils.rs
index c3e4b2019..18f9792ab 100644
--- a/soroban-env-host/src/testutils.rs
+++ b/soroban-env-host/src/testutils.rs
@@ -146,9 +146,11 @@ impl SnapshotSource for MockSnapshotSource {
 
 #[cfg(test)]
 pub(crate) fn interface_meta_with_custom_versions(proto: u32, pre: u32) -> Vec<u8> {
-    use crate::xdr::{Limited, Limits, ScEnvMetaEntry, WriteXdr};
-    let iv = crate::meta::make_interface_version(proto, pre);
-    let entry = ScEnvMetaEntry::ScEnvMetaKindInterfaceVersion(iv);
+    use crate::xdr::{Limited, Limits, ScEnvMetaEntry, ScEnvMetaEntryInterfaceVersion, WriteXdr};
+    let entry = ScEnvMetaEntry::ScEnvMetaKindInterfaceVersion(ScEnvMetaEntryInterfaceVersion {
+        protocol: proto,
+        pre_release: pre,
+    });
     let bytes = Vec::<u8>::new();
     let mut w = Limited::new(bytes, Limits::none());
     entry.write_xdr(&mut w).unwrap();
@@ -163,8 +165,7 @@ impl Host {
     }
 
     pub fn current_test_protocol() -> u32 {
-        use crate::meta::{get_ledger_protocol_version, INTERFACE_VERSION};
-        let max_supported_protocol = get_ledger_protocol_version(INTERFACE_VERSION);
+        let max_supported_protocol = crate::meta::INTERFACE_VERSION.protocol;
         let min_supported_protocol = crate::host::MIN_LEDGER_PROTOCOL_VERSION;
         if let Ok(vers) = std::env::var("TEST_PROTOCOL") {
             let test_protocol = vers.parse().expect("parsing TEST_PROTOCOL");
diff --git a/soroban-env-host/src/vm/parsed_module.rs b/soroban-env-host/src/vm/parsed_module.rs
index 08d6ac906..096653cf8 100644
--- a/soroban-env-host/src/vm/parsed_module.rs
+++ b/soroban-env-host/src/vm/parsed_module.rs
@@ -1,8 +1,11 @@
 use crate::{
     err,
     host::metered_clone::MeteredContainer,
-    meta::{self, get_ledger_protocol_version},
-    xdr::{ContractCostType, Limited, ReadXdr, ScEnvMetaEntry, ScErrorCode, ScErrorType},
+    meta,
+    xdr::{
+        ContractCostType, Limited, ReadXdr, ScEnvMetaEntry, ScEnvMetaEntryInterfaceVersion,
+        ScErrorCode, ScErrorType,
+    },
     Host, HostError, DEFAULT_XDR_RW_LIMITS,
 };
 
@@ -219,18 +222,18 @@ impl ParsedModule {
 
         Self::check_max_args(host, &module)?;
         let interface_version = Self::check_meta_section(host, &module)?;
-        let contract_proto = get_ledger_protocol_version(interface_version);
+        let contract_proto = interface_version.protocol;
 
         Ok((module, contract_proto))
     }
 
     fn check_contract_interface_version(
         host: &Host,
-        interface_version: u64,
+        interface_version: &ScEnvMetaEntryInterfaceVersion,
     ) -> Result<(), HostError> {
         let want_proto = {
             let ledger_proto = host.get_ledger_protocol_version()?;
-            let env_proto = get_ledger_protocol_version(meta::INTERFACE_VERSION);
+            let env_proto = meta::INTERFACE_VERSION.protocol;
             if ledger_proto <= env_proto {
                 // ledger proto should be before or equal to env proto
                 ledger_proto
@@ -247,9 +250,9 @@ impl ParsedModule {
 
         // Not used when "next" is enabled
         #[cfg(not(feature = "next"))]
-        let got_pre = meta::get_pre_release_version(interface_version);
+        let got_pre = interface_version.pre_release;
 
-        let got_proto = get_ledger_protocol_version(interface_version);
+        let got_proto = interface_version.protocol;
 
         if got_proto < want_proto {
             // Old protocols are finalized, we only support contracts
@@ -277,7 +280,7 @@ impl ParsedModule {
             {
                 // Current protocol might have a nonzero prerelease number; we will
                 // allow it only if it matches the current prerelease exactly.
-                let want_pre = meta::get_pre_release_version(meta::INTERFACE_VERSION);
+                let want_pre = meta::INTERFACE_VERSION.pre_release;
                 if want_pre != got_pre {
                     return Err(err!(
                         host,
@@ -321,7 +324,10 @@ impl ParsedModule {
         Self::module_custom_section(&self.module, name)
     }
 
-    fn check_meta_section(host: &Host, m: &Module) -> Result<u64, HostError> {
+    fn check_meta_section(
+        host: &Host,
+        m: &Module,
+    ) -> Result<ScEnvMetaEntryInterfaceVersion, HostError> {
         if let Some(env_meta) = Self::module_custom_section(m, meta::ENV_META_V0_SECTION_NAME) {
             let mut limits = DEFAULT_XDR_RW_LIMITS;
             limits.len = env_meta.len();
@@ -329,7 +335,7 @@ impl ParsedModule {
             if let Some(env_meta_entry) = ScEnvMetaEntry::read_xdr_iter(&mut cursor).next() {
                 let ScEnvMetaEntry::ScEnvMetaKindInterfaceVersion(v) =
                     host.map_err(env_meta_entry)?;
-                Self::check_contract_interface_version(host, v)?;
+                Self::check_contract_interface_version(host, &v)?;
                 Ok(v)
             } else {
                 Err(host.err(
diff --git a/soroban-env-macros/src/lib.rs b/soroban-env-macros/src/lib.rs
index 6d7c2751a..7d2aff15b 100644
--- a/soroban-env-macros/src/lib.rs
+++ b/soroban-env-macros/src/lib.rs
@@ -17,7 +17,7 @@ use stellar_xdr::curr as xdr;
 #[cfg(feature = "next")]
 use stellar_xdr::next as xdr;
 
-use crate::xdr::{Limits, ScEnvMetaEntry, WriteXdr};
+use crate::xdr::{Limits, ScEnvMetaEntry, ScEnvMetaEntryInterfaceVersion, WriteXdr};
 
 // We need the protocol version for some tests generated by this crate.
 // Unfortunately it is not available at this layer and can't read from
@@ -29,7 +29,7 @@ pub(crate) const LEDGER_PROTOCOL_VERSION: u32 = 22;
 pub(crate) const LEDGER_PROTOCOL_VERSION: u32 = 23;
 
 struct MetaInput {
-    pub interface_version: u64,
+    pub interface_version: ScEnvMetaEntryInterfaceVersion,
 }
 
 impl Parse for MetaInput {
@@ -38,16 +38,17 @@ impl Parse for MetaInput {
             interface_version: {
                 assert_eq!(input.parse::<Ident>()?, "ledger_protocol_version");
                 input.parse::<Token![:]>()?;
-                let proto: u64 = input.parse::<LitInt>()?.base10_parse()?;
+                let proto: u32 = input.parse::<LitInt>()?.base10_parse()?;
                 input.parse::<Token![,]>()?;
                 assert_eq!(input.parse::<Ident>()?, "pre_release_version");
                 input.parse::<Token![:]>()?;
-                let pre: u64 = input.parse::<LitInt>()?.base10_parse()?;
+                let pre: u32 = input.parse::<LitInt>()?.base10_parse()?;
                 input.parse::<Token![,]>()?;
-                assert!(pre <= 0xffff_ffff);
-                assert!(proto <= 0xffff_ffff);
-                assert_eq!(proto, LEDGER_PROTOCOL_VERSION as u64);
-                proto << 32 | pre
+                assert_eq!(proto, LEDGER_PROTOCOL_VERSION);
+                ScEnvMetaEntryInterfaceVersion {
+                    protocol: proto,
+                    pre_release: pre,
+                }
             },
         })
     }
@@ -60,7 +61,7 @@ struct MetaConstsOutput {
 impl MetaConstsOutput {
     pub fn to_meta_entries(&self) -> Vec<ScEnvMetaEntry> {
         vec![ScEnvMetaEntry::ScEnvMetaKindInterfaceVersion(
-            self.input.interface_version,
+            self.input.interface_version.clone(),
         )]
     }
 }
@@ -68,7 +69,8 @@ impl MetaConstsOutput {
 impl ToTokens for MetaConstsOutput {
     fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) {
         // Build params for expressing the interface version.
-        let interface_version = self.input.interface_version;
+        let proto = &self.input.interface_version.protocol;
+        let pre = &self.input.interface_version.pre_release;
 
         // Build params for expressing the meta xdr.
         let meta_xdr = self
@@ -84,7 +86,10 @@ impl ToTokens for MetaConstsOutput {
 
         // Output.
         tokens.extend(quote! {
-            pub const INTERFACE_VERSION: u64 = #interface_version;
+            pub const INTERFACE_VERSION: ScEnvMetaEntryInterfaceVersion = ScEnvMetaEntryInterfaceVersion{
+                protocol: #proto,
+                pre_release: #pre,
+            };
             pub const XDR: [u8; #meta_xdr_len] = *#meta_xdr_lit;
         });
     }
diff --git a/soroban-synth-wasm/src/mod_emitter.rs b/soroban-synth-wasm/src/mod_emitter.rs
index 42a6aae1b..c0518ab47 100644
--- a/soroban-synth-wasm/src/mod_emitter.rs
+++ b/soroban-synth-wasm/src/mod_emitter.rs
@@ -1,5 +1,5 @@
 use crate::FuncEmitter;
-use soroban_env_common::xdr::{Limits, ScEnvMetaEntry, WriteXdr};
+use soroban_env_common::xdr::{Limits, ScEnvMetaEntry, ScEnvMetaEntryInterfaceVersion, WriteXdr};
 use std::str::FromStr;
 use std::{borrow::Cow, collections::BTreeMap, env};
 #[cfg(feature = "adversarial")]
@@ -117,9 +117,10 @@ impl ModEmitter {
     /// Add a metadata section marking the module as belonging to the specified
     /// protocol version.
     pub fn add_protocol_version_meta(&mut self, protocol_version: u32) -> &mut Self {
-        let meta = ScEnvMetaEntry::ScEnvMetaKindInterfaceVersion(
-            soroban_env_common::meta::make_interface_version(protocol_version, 0),
-        );
+        let meta = ScEnvMetaEntry::ScEnvMetaKindInterfaceVersion(ScEnvMetaEntryInterfaceVersion {
+            protocol: protocol_version,
+            pre_release: 0,
+        });
         self.custom_section(
             soroban_env_common::meta::ENV_META_V0_SECTION_NAME,
             &meta.to_xdr(Limits::none()).unwrap(),
@@ -133,9 +134,7 @@ impl ModEmitter {
     pub fn add_test_protocol_version_meta(&mut self) -> &mut Self {
         let protocol_version = env::var("TEST_PROTOCOL")
             .map(|v| u32::from_str(&v).unwrap())
-            .unwrap_or(soroban_env_common::meta::get_ledger_protocol_version(
-                soroban_env_common::meta::INTERFACE_VERSION,
-            ));
+            .unwrap_or(soroban_env_common::meta::INTERFACE_VERSION.protocol);
         self.add_protocol_version_meta(protocol_version)
     }