diff --git a/src/config/commandline.rs b/src/config/commandline.rs
index f850a71..fef72a8 100644
--- a/src/config/commandline.rs
+++ b/src/config/commandline.rs
@@ -53,6 +53,7 @@ impl Args {
                 address,
                 api_key,
                 client_timeout,
+                upgrade_concurrency,
                 metrics_prometheus_address,
                 media_preprocess_steps,
                 media_external_validation,
@@ -113,6 +114,10 @@ impl Args {
                     timeout: client_timeout,
                 };
 
+                let upgrade = Upgrade {
+                    concurrency: upgrade_concurrency,
+                };
+
                 let metrics = Metrics {
                     prometheus_address: metrics_prometheus_address,
                 };
@@ -200,6 +205,7 @@ impl Args {
                             config_format: ConfigFormat {
                                 server,
                                 client,
+                                upgrade,
                                 old_repo,
                                 tracing,
                                 metrics,
@@ -218,6 +224,7 @@ impl Args {
                             config_format: ConfigFormat {
                                 server,
                                 client,
+                                upgrade,
                                 old_repo,
                                 tracing,
                                 metrics,
@@ -234,6 +241,7 @@ impl Args {
                         config_format: ConfigFormat {
                             server,
                             client,
+                            upgrade,
                             old_repo,
                             tracing,
                             metrics,
@@ -254,6 +262,7 @@ impl Args {
             }) => {
                 let server = Server::default();
                 let client = Client::default();
+                let upgrade = Upgrade::default();
                 let media = Media::default();
                 let metrics = Metrics::default();
 
@@ -263,6 +272,7 @@ impl Args {
                             config_format: ConfigFormat {
                                 server,
                                 client,
+                                upgrade,
                                 old_repo,
                                 tracing,
                                 metrics,
@@ -284,6 +294,7 @@ impl Args {
                                 config_format: ConfigFormat {
                                     server,
                                     client,
+                                    upgrade,
                                     old_repo,
                                     tracing,
                                     metrics,
@@ -309,6 +320,7 @@ impl Args {
                                     config_format: ConfigFormat {
                                         server,
                                         client,
+                                        upgrade,
                                         old_repo,
                                         tracing,
                                         metrics,
@@ -333,6 +345,7 @@ impl Args {
                                 config_format: ConfigFormat {
                                     server,
                                     client,
+                                    upgrade,
                                     old_repo,
                                     tracing,
                                     metrics,
@@ -356,6 +369,7 @@ impl Args {
             Command::MigrateRepo(MigrateRepo { repo }) => {
                 let server = Server::default();
                 let client = Client::default();
+                let upgrade = Upgrade::default();
                 let media = Media::default();
                 let metrics = Metrics::default();
 
@@ -365,6 +379,7 @@ impl Args {
                             config_format: ConfigFormat {
                                 server,
                                 client,
+                                upgrade,
                                 old_repo,
                                 tracing,
                                 metrics,
@@ -383,6 +398,7 @@ impl Args {
                             config_format: ConfigFormat {
                                 server,
                                 client,
+                                upgrade,
                                 old_repo,
                                 tracing,
                                 metrics,
@@ -403,6 +419,7 @@ impl Args {
                             config_format: ConfigFormat {
                                 server,
                                 client,
+                                upgrade,
                                 old_repo,
                                 tracing,
                                 metrics,
@@ -421,6 +438,7 @@ impl Args {
                             config_format: ConfigFormat {
                                 server,
                                 client,
+                                upgrade,
                                 old_repo,
                                 tracing,
                                 metrics,
@@ -470,6 +488,7 @@ pub(crate) enum Operation {
 pub(super) struct ConfigFormat {
     server: Server,
     client: Client,
+    upgrade: Upgrade,
     #[serde(skip_serializing_if = "Option::is_none")]
     old_repo: Option<OldSled>,
     tracing: Tracing,
@@ -501,6 +520,13 @@ struct Client {
     timeout: Option<u64>,
 }
 
+#[derive(Debug, Default, serde::Serialize)]
+#[serde(rename_all = "snake_case")]
+struct Upgrade {
+    #[serde(skip_serializing_if = "Option::is_none")]
+    concurrency: Option<usize>,
+}
+
 #[derive(Debug, Default, serde::Serialize)]
 #[serde(rename_all = "snake_case")]
 struct Tracing {
@@ -870,6 +896,12 @@ struct Run {
     #[arg(long)]
     client_timeout: Option<u64>,
 
+    /// How many hashes pict-rs should try to migrate from 0.4 to 0.5 concurrently
+    ///
+    /// This number defaults to 32, but can be increased for better throughput
+    #[arg(long)]
+    upgrade_concurrency: Option<usize>,
+
     /// Whether to enable the prometheus scrape endpoint
     #[arg(long)]
     metrics_prometheus_address: Option<SocketAddr>,
diff --git a/src/config/defaults.rs b/src/config/defaults.rs
index 21d3b71..12efde3 100644
--- a/src/config/defaults.rs
+++ b/src/config/defaults.rs
@@ -9,6 +9,7 @@ use std::{net::SocketAddr, path::PathBuf};
 pub(crate) struct Defaults {
     server: ServerDefaults,
     client: ClientDefaults,
+    upgrade: UpgradeDefaults,
     tracing: TracingDefaults,
     media: MediaDefaults,
     repo: RepoDefaults,
@@ -29,6 +30,12 @@ struct ClientDefaults {
     timeout: u64,
 }
 
+#[derive(Clone, Debug, serde::Serialize)]
+#[serde(rename_all = "snake_case")]
+struct UpgradeDefaults {
+    concurrency: usize,
+}
+
 #[derive(Clone, Debug, Default, serde::Serialize)]
 #[serde(rename_all = "snake_case")]
 struct TracingDefaults {
@@ -185,6 +192,12 @@ impl Default for ClientDefaults {
     }
 }
 
+impl Default for UpgradeDefaults {
+    fn default() -> Self {
+        UpgradeDefaults { concurrency: 32 }
+    }
+}
+
 impl Default for LoggingDefaults {
     fn default() -> Self {
         LoggingDefaults {
diff --git a/src/config/file.rs b/src/config/file.rs
index 3bf7e41..8894100 100644
--- a/src/config/file.rs
+++ b/src/config/file.rs
@@ -13,6 +13,8 @@ pub(crate) struct ConfigFile {
 
     pub(crate) client: Client,
 
+    pub(crate) upgrade: Upgrade,
+
     pub(crate) tracing: Tracing,
 
     #[serde(default)]
@@ -119,6 +121,11 @@ pub(crate) struct Client {
     pub(crate) timeout: u64,
 }
 
+#[derive(Clone, Debug, serde::Deserialize, serde::Serialize)]
+pub(crate) struct Upgrade {
+    pub(crate) concurrency: usize,
+}
+
 #[derive(Clone, Debug, serde::Deserialize, serde::Serialize)]
 #[serde(rename_all = "snake_case")]
 pub(crate) struct Tracing {
diff --git a/src/repo/migrate.rs b/src/repo/migrate.rs
index 5eea7e2..4dba2cb 100644
--- a/src/repo/migrate.rs
+++ b/src/repo/migrate.rs
@@ -15,7 +15,6 @@ use crate::{
     store::Store,
 };
 
-const MIGRATE_CONCURRENCY: usize = 32;
 const GENERATOR_KEY: &str = "last-path";
 
 #[tracing::instrument(skip_all)]
@@ -110,7 +109,7 @@ pub(crate) async fn migrate_04<S: Store + 'static>(
             tracing::warn!("Failed to read hash, skipping");
         }
 
-        while set.len() >= MIGRATE_CONCURRENCY {
+        while set.len() >= config.upgrade.concurrency {
             if set.join_next().await.is_some() {
                 index += 1;