diff --git a/python/Cargo.lock b/python/Cargo.lock
index 8b761993..857da152 100644
--- a/python/Cargo.lock
+++ b/python/Cargo.lock
@@ -1167,6 +1167,7 @@ dependencies = [
  "thiserror 1.0.69",
  "tokio",
  "url",
+ "zstd-sys",
 ]
 
 [[package]]
diff --git a/python/geoarrow-io/Cargo.toml b/python/geoarrow-io/Cargo.toml
index 687169ca..c7770edf 100644
--- a/python/geoarrow-io/Cargo.toml
+++ b/python/geoarrow-io/Cargo.toml
@@ -77,3 +77,7 @@ url = "2.5"
 reqwest = { version = "*", features = ["rustls-tls-native-roots"] }
 # Compile openssl from source
 openssl = { version = "0.10", features = ["vendored"] }
+
+# Pin to fix strange pyodide compilation errors.
+# See https://github.com/geoarrow/geoarrow-rs/issues/868
+zstd-sys = "2.0.12+zstd.1.5.6"