diff --git a/src/2.1-JsonMergePatch/Builders/PatchBuilder.cs b/src/2.1-JsonMergePatch/Builders/PatchBuilder.cs
index 9c134d2..d5b334e 100644
--- a/src/2.1-JsonMergePatch/Builders/PatchBuilder.cs
+++ b/src/2.1-JsonMergePatch/Builders/PatchBuilder.cs
@@ -41,7 +41,9 @@ private static void AddOperation(JsonMergePatchDocument jsonMergePatchDocument,
 		{
 			foreach (var jProperty in patchObject)
 			{
-				var path = pathPrefix + jProperty.Key;
+				// Encode any possible "/" in the path. Ref: https://tools.ietf.org/html/rfc6901#section-3
+				var path = pathPrefix + jProperty.Key.Replace("/", "~1");
+
 				if (jProperty.Value is JValue jValue)
 				{
 					if (options.EnableDelete && jValue.Value == null)
diff --git a/src/3.0-JsonMergePatch.NewtonsoftJson/Builders/PatchBuilder.cs b/src/3.0-JsonMergePatch.NewtonsoftJson/Builders/PatchBuilder.cs
index 40fc0b7..59a04a8 100644
--- a/src/3.0-JsonMergePatch.NewtonsoftJson/Builders/PatchBuilder.cs
+++ b/src/3.0-JsonMergePatch.NewtonsoftJson/Builders/PatchBuilder.cs
@@ -44,7 +44,9 @@ private static void AddOperation(IInternalJsonMergePatchDocument jsonMergePatchD
 		{
 			foreach (var jProperty in patchObject)
 			{
-				var path = pathPrefix + jProperty.Key;
+				// Encode any possible "/" in the path. Ref: https://tools.ietf.org/html/rfc6901#section-3
+				var path = pathPrefix + jProperty.Key.Replace("/", "~1");
+
 				if (jProperty.Value is JValue jValue)
 				{
 					if (options.EnableDelete && jValue.Value == null)
diff --git a/src/3.0-JsonMergePatch.Tests/NewtonsoftJson/Builders/Json/Simple.cs b/src/3.0-JsonMergePatch.Tests/NewtonsoftJson/Builders/Json/Simple.cs
index 118cb39..a65a871 100644
--- a/src/3.0-JsonMergePatch.Tests/NewtonsoftJson/Builders/Json/Simple.cs
+++ b/src/3.0-JsonMergePatch.Tests/NewtonsoftJson/Builders/Json/Simple.cs
@@ -2,6 +2,8 @@
 using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
 using System;
+using System.Collections.Generic;
+using System.Linq;
 using Xunit;
 
 namespace Morcatko.AspNetCore.JsonMergePatch.Tests.NewtonsoftJson.Builders.Json
@@ -14,6 +16,7 @@ class SimpleClass
 			public int Integer { get; set; } = 1;
 			public string String { get; set; } = "abc";
 			public DateTimeOffset Date { get; set; } = new DateTimeOffset(2019, 10, 29, 9, 38, 0, 0, TimeSpan.FromHours(2));
+			public Dictionary<string, object> Dic { get; set; } = new Dictionary<string, object>();
 		}
 
 		private readonly PatchBuilder<SimpleClass> builder = new PatchBuilder<SimpleClass>();
@@ -29,6 +32,17 @@ public void String()
 			Assert.Equal(3, result.Integer);
 		}
 
+		[Fact]
+		public void DictionaryAddKeyWithSlash()
+		{
+			var original = new SimpleClass();
+
+			var patch = builder.Build("{ \"Dic\": { \"key/1\": {} }");
+			var result = patch.ApplyTo(original);
+
+			Assert.Equal("key/1", result.Dic.First().Key);
+		}
+
 		[Fact]
 		public void StringForDateTimeOffset()
 		{
diff --git a/src/3.0-JsonMergePatch.Tests/NewtonsoftJson/Patching/PatchTest.cs b/src/3.0-JsonMergePatch.Tests/NewtonsoftJson/Patching/PatchTest.cs
index dfccb02..c9c7c38 100644
--- a/src/3.0-JsonMergePatch.Tests/NewtonsoftJson/Patching/PatchTest.cs
+++ b/src/3.0-JsonMergePatch.Tests/NewtonsoftJson/Patching/PatchTest.cs
@@ -1,4 +1,5 @@
 using Morcatko.AspNetCore.JsonMergePatch.NewtonsoftJson.Builders;
+using System.Linq;
 using Xunit;
 
 namespace Morcatko.AspNetCore.JsonMergePatch.Tests.NewtonsoftJson.Patching