diff --git a/src/main/java/com/stripe/model/v2/core/Account.java b/src/main/java/com/stripe/model/v2/core/Account.java
index 269497a1f2d..4af8544f7f8 100644
--- a/src/main/java/com/stripe/model/v2/core/Account.java
+++ b/src/main/java/com/stripe/model/v2/core/Account.java
@@ -5,6 +5,7 @@
 import com.stripe.model.HasId;
 import com.stripe.model.StripeObject;
 import com.stripe.v2.Amount;
+import java.math.BigDecimal;
 import java.time.Instant;
 import java.util.List;
 import java.util.Map;
@@ -5345,7 +5346,7 @@ public static class Relationship extends StripeObject {
 
         /** The percentage of the Account's identity that the individual owns. */
         @SerializedName("percent_ownership")
-        String percentOwnership;
+        BigDecimal percentOwnership;
 
         /**
          * Whether the individual is authorized as the primary representative of the Account. This
diff --git a/src/main/java/com/stripe/model/v2/core/AccountPerson.java b/src/main/java/com/stripe/model/v2/core/AccountPerson.java
index f3ce221205d..25eed6ceaab 100644
--- a/src/main/java/com/stripe/model/v2/core/AccountPerson.java
+++ b/src/main/java/com/stripe/model/v2/core/AccountPerson.java
@@ -4,6 +4,7 @@
 import com.google.gson.annotations.SerializedName;
 import com.stripe.model.HasId;
 import com.stripe.model.StripeObject;
+import java.math.BigDecimal;
 import java.time.Instant;
 import java.util.List;
 import java.util.Map;
@@ -584,7 +585,7 @@ public static class Relationship extends StripeObject {
 
     /** The percentage of the Account's identity that the individual owns. */
     @SerializedName("percent_ownership")
-    String percentOwnership;
+    BigDecimal percentOwnership;
 
     /**
      * Whether the individual is authorized as the primary representative of the Account. This is
diff --git a/src/main/java/com/stripe/net/JsonEncoder.java b/src/main/java/com/stripe/net/JsonEncoder.java
index 35de33bc6a2..898a7d6f5e3 100644
--- a/src/main/java/com/stripe/net/JsonEncoder.java
+++ b/src/main/java/com/stripe/net/JsonEncoder.java
@@ -3,15 +3,42 @@
 import com.google.gson.FieldNamingPolicy;
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
+import com.google.gson.TypeAdapter;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonWriter;
 import java.io.IOException;
+import java.math.BigDecimal;
 import java.util.HashMap;
 import java.util.Map;
 
 final class JsonEncoder {
+  /**
+   * Serializes BigDecimal as a JSON string (e.g., "25.5") rather than a JSON number (25.5). All
+   * BigDecimal fields in the Stripe API use format: decimal, and the V2 API expects them as strings
+   * on the wire.
+   */
+  private static final TypeAdapter<BigDecimal> BIG_DECIMAL_STRING_ADAPTER =
+      new TypeAdapter<BigDecimal>() {
+        @Override
+        public void write(JsonWriter out, BigDecimal value) throws IOException {
+          if (value == null) {
+            out.nullValue();
+          } else {
+            out.value(value.toPlainString());
+          }
+        }
+
+        @Override
+        public BigDecimal read(JsonReader in) throws IOException {
+          return new BigDecimal(in.nextString());
+        }
+      };
+
   private static final Gson BODY_GSON =
       new GsonBuilder()
           .setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
           .serializeNulls()
+          .registerTypeAdapter(BigDecimal.class, BIG_DECIMAL_STRING_ADAPTER)
           .create();
 
   public static HttpContent createHttpContent(Map<String, Object> params) throws IOException {
diff --git a/src/main/java/com/stripe/param/v2/core/AccountCreateParams.java b/src/main/java/com/stripe/param/v2/core/AccountCreateParams.java
index 48026ef7d63..f804f21010d 100644
--- a/src/main/java/com/stripe/param/v2/core/AccountCreateParams.java
+++ b/src/main/java/com/stripe/param/v2/core/AccountCreateParams.java
@@ -4,6 +4,7 @@
 import com.google.gson.annotations.SerializedName;
 import com.stripe.net.ApiRequestParams;
 import com.stripe.v2.Amount;
+import java.math.BigDecimal;
 import java.time.Instant;
 import java.util.ArrayList;
 import java.util.HashMap;
@@ -15655,7 +15656,7 @@ public static class Relationship {
 
         /** The percent owned by the person of the account's legal entity. */
         @SerializedName("percent_ownership")
-        String percentOwnership;
+        BigDecimal percentOwnership;
 
         /** The person's title (e.g., CEO, Support Engineer). */
         @SerializedName("title")
@@ -15666,7 +15667,7 @@ private Relationship(
             Boolean executive,
             Map<String, Object> extraParams,
             Boolean owner,
-            String percentOwnership,
+            BigDecimal percentOwnership,
             String title) {
           this.director = director;
           this.executive = executive;
@@ -15689,7 +15690,7 @@ public static class Builder {
 
           private Boolean owner;
 
-          private String percentOwnership;
+          private BigDecimal percentOwnership;
 
           private String title;
 
@@ -15758,7 +15759,7 @@ public Builder setOwner(Boolean owner) {
           }
 
           /** The percent owned by the person of the account's legal entity. */
-          public Builder setPercentOwnership(String percentOwnership) {
+          public Builder setPercentOwnership(BigDecimal percentOwnership) {
             this.percentOwnership = percentOwnership;
             return this;
           }
diff --git a/src/main/java/com/stripe/param/v2/core/AccountTokenCreateParams.java b/src/main/java/com/stripe/param/v2/core/AccountTokenCreateParams.java
index f2dec5cc6e3..4057ecb4dd6 100644
--- a/src/main/java/com/stripe/param/v2/core/AccountTokenCreateParams.java
+++ b/src/main/java/com/stripe/param/v2/core/AccountTokenCreateParams.java
@@ -5,6 +5,7 @@
 import com.stripe.net.ApiRequestParams;
 import com.stripe.param.common.EmptyParam;
 import com.stripe.v2.Amount;
+import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -7123,7 +7124,7 @@ public static class Relationship {
 
         /** The percent owned by the person of the account's legal entity. */
         @SerializedName("percent_ownership")
-        String percentOwnership;
+        BigDecimal percentOwnership;
 
         /** The person's title (e.g., CEO, Support Engineer). */
         @SerializedName("title")
@@ -7134,7 +7135,7 @@ private Relationship(
             Boolean executive,
             Map<String, Object> extraParams,
             Boolean owner,
-            String percentOwnership,
+            BigDecimal percentOwnership,
             String title) {
           this.director = director;
           this.executive = executive;
@@ -7157,7 +7158,7 @@ public static class Builder {
 
           private Boolean owner;
 
-          private String percentOwnership;
+          private BigDecimal percentOwnership;
 
           private String title;
 
@@ -7226,7 +7227,7 @@ public Builder setOwner(Boolean owner) {
           }
 
           /** The percent owned by the person of the account's legal entity. */
-          public Builder setPercentOwnership(String percentOwnership) {
+          public Builder setPercentOwnership(BigDecimal percentOwnership) {
             this.percentOwnership = percentOwnership;
             return this;
           }
diff --git a/src/main/java/com/stripe/param/v2/core/AccountUpdateParams.java b/src/main/java/com/stripe/param/v2/core/AccountUpdateParams.java
index 7bbc94507b1..63db37871ad 100644
--- a/src/main/java/com/stripe/param/v2/core/AccountUpdateParams.java
+++ b/src/main/java/com/stripe/param/v2/core/AccountUpdateParams.java
@@ -5,6 +5,7 @@
 import com.stripe.net.ApiRequestParams;
 import com.stripe.param.common.EmptyParam;
 import com.stripe.v2.Amount;
+import java.math.BigDecimal;
 import java.time.Instant;
 import java.util.ArrayList;
 import java.util.HashMap;
@@ -17078,7 +17079,7 @@ public Builder setOwner(Boolean owner) {
           }
 
           /** The percent owned by the person of the account's legal entity. */
-          public Builder setPercentOwnership(String percentOwnership) {
+          public Builder setPercentOwnership(BigDecimal percentOwnership) {
             this.percentOwnership = percentOwnership;
             return this;
           }
diff --git a/src/main/java/com/stripe/param/v2/core/accounts/PersonCreateParams.java b/src/main/java/com/stripe/param/v2/core/accounts/PersonCreateParams.java
index cb190454762..23964e137e1 100644
--- a/src/main/java/com/stripe/param/v2/core/accounts/PersonCreateParams.java
+++ b/src/main/java/com/stripe/param/v2/core/accounts/PersonCreateParams.java
@@ -3,6 +3,7 @@
 
 import com.google.gson.annotations.SerializedName;
 import com.stripe.net.ApiRequestParams;
+import java.math.BigDecimal;
 import java.time.Instant;
 import java.util.ArrayList;
 import java.util.HashMap;
@@ -2575,7 +2576,7 @@ public static class Relationship {
 
     /** The percentage of ownership the person has in the associated legal entity. */
     @SerializedName("percent_ownership")
-    String percentOwnership;
+    BigDecimal percentOwnership;
 
     /** Indicates whether the person is a representative of the associated legal entity. */
     @SerializedName("representative")
@@ -2592,7 +2593,7 @@ private Relationship(
         Map<String, Object> extraParams,
         Boolean legalGuardian,
         Boolean owner,
-        String percentOwnership,
+        BigDecimal percentOwnership,
         Boolean representative,
         String title) {
       this.authorizer = authorizer;
@@ -2623,7 +2624,7 @@ public static class Builder {
 
       private Boolean owner;
 
-      private String percentOwnership;
+      private BigDecimal percentOwnership;
 
       private Boolean representative;
 
@@ -2700,7 +2701,7 @@ public Builder setOwner(Boolean owner) {
       }
 
       /** The percentage of ownership the person has in the associated legal entity. */
-      public Builder setPercentOwnership(String percentOwnership) {
+      public Builder setPercentOwnership(BigDecimal percentOwnership) {
         this.percentOwnership = percentOwnership;
         return this;
       }
diff --git a/src/main/java/com/stripe/param/v2/core/accounts/PersonTokenCreateParams.java b/src/main/java/com/stripe/param/v2/core/accounts/PersonTokenCreateParams.java
index 5d4fae4ceb8..47d2c7f0f15 100644
--- a/src/main/java/com/stripe/param/v2/core/accounts/PersonTokenCreateParams.java
+++ b/src/main/java/com/stripe/param/v2/core/accounts/PersonTokenCreateParams.java
@@ -4,6 +4,7 @@
 import com.google.gson.annotations.SerializedName;
 import com.stripe.net.ApiRequestParams;
 import com.stripe.param.common.EmptyParam;
+import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -2545,7 +2546,7 @@ public static class Relationship {
 
     /** The percentage of ownership the person has in the associated legal entity. */
     @SerializedName("percent_ownership")
-    String percentOwnership;
+    BigDecimal percentOwnership;
 
     /** Indicates whether the person is a representative of the associated legal entity. */
     @SerializedName("representative")
@@ -2562,7 +2563,7 @@ private Relationship(
         Map<String, Object> extraParams,
         Boolean legalGuardian,
         Boolean owner,
-        String percentOwnership,
+        BigDecimal percentOwnership,
         Boolean representative,
         String title) {
       this.authorizer = authorizer;
@@ -2593,7 +2594,7 @@ public static class Builder {
 
       private Boolean owner;
 
-      private String percentOwnership;
+      private BigDecimal percentOwnership;
 
       private Boolean representative;
 
@@ -2670,7 +2671,7 @@ public Builder setOwner(Boolean owner) {
       }
 
       /** The percentage of ownership the person has in the associated legal entity. */
-      public Builder setPercentOwnership(String percentOwnership) {
+      public Builder setPercentOwnership(BigDecimal percentOwnership) {
         this.percentOwnership = percentOwnership;
         return this;
       }
diff --git a/src/main/java/com/stripe/param/v2/core/accounts/PersonUpdateParams.java b/src/main/java/com/stripe/param/v2/core/accounts/PersonUpdateParams.java
index c886d483511..001c826555a 100644
--- a/src/main/java/com/stripe/param/v2/core/accounts/PersonUpdateParams.java
+++ b/src/main/java/com/stripe/param/v2/core/accounts/PersonUpdateParams.java
@@ -4,6 +4,7 @@
 import com.google.gson.annotations.SerializedName;
 import com.stripe.net.ApiRequestParams;
 import com.stripe.param.common.EmptyParam;
+import java.math.BigDecimal;
 import java.time.Instant;
 import java.util.ArrayList;
 import java.util.HashMap;
@@ -2918,7 +2919,7 @@ public Builder setOwner(Boolean owner) {
       }
 
       /** The percentage of ownership the person has in the associated legal entity. */
-      public Builder setPercentOwnership(String percentOwnership) {
+      public Builder setPercentOwnership(BigDecimal percentOwnership) {
         this.percentOwnership = percentOwnership;
         return this;
       }