diff --git a/src/Npgsql.EntityFrameworkCore.PostgreSQL.Design/project.json b/src/Npgsql.EntityFrameworkCore.PostgreSQL.Design/project.json
index e9f14673d..dcdd5217a 100644
--- a/src/Npgsql.EntityFrameworkCore.PostgreSQL.Design/project.json
+++ b/src/Npgsql.EntityFrameworkCore.PostgreSQL.Design/project.json
@@ -25,7 +25,7 @@
     "Microsoft.Extensions.DependencyInjection": "1.0.0",
     "Microsoft.Extensions.DependencyInjection.Abstractions": "1.0.0",
     "Npgsql.EntityFrameworkCore.PostgreSQL": "1.0.2-*",
-    "Npgsql": "3.1.5"
+    "Npgsql": "3.1.8"
   },
   "frameworks": {
     "net451": {},
diff --git a/src/Npgsql.EntityFrameworkCore.PostgreSQL/project.json b/src/Npgsql.EntityFrameworkCore.PostgreSQL/project.json
index ffffe77b7..b6ff1dc26 100644
--- a/src/Npgsql.EntityFrameworkCore.PostgreSQL/project.json
+++ b/src/Npgsql.EntityFrameworkCore.PostgreSQL/project.json
@@ -22,7 +22,7 @@
     "Microsoft.EntityFrameworkCore.Relational": "1.0.1",
     "Microsoft.Extensions.DependencyInjection.Abstractions": "1.0.0",
     "Microsoft.Extensions.DependencyInjection": "1.0.0",
-    "Npgsql": "3.1.5"
+    "Npgsql": "3.1.8"
   },
   "frameworks": {
     "net451": {},
diff --git a/test/Npgsql.EntityFrameworkCore.PostgreSQL.FunctionalTests/project.json b/test/Npgsql.EntityFrameworkCore.PostgreSQL.FunctionalTests/project.json
index 3ca222bf0..e6fb1f056 100644
--- a/test/Npgsql.EntityFrameworkCore.PostgreSQL.FunctionalTests/project.json
+++ b/test/Npgsql.EntityFrameworkCore.PostgreSQL.FunctionalTests/project.json
@@ -12,7 +12,7 @@
     "Microsoft.Extensions.Configuration.Json": "1.0.0",
     "Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0",
     "Npgsql.EntityFrameworkCore.PostgreSQL": "1.0.2-*",
-    "Npgsql": "3.1.5"
+    "Npgsql": "3.1.8"
   },
   "publishOptions": {
     "include": "**/*.sql",
diff --git a/test/Npgsql.EntityFrameworkCore.PostgreSQL.Tests/project.json b/test/Npgsql.EntityFrameworkCore.PostgreSQL.Tests/project.json
index 7aae0442f..aa5bd31cf 100644
--- a/test/Npgsql.EntityFrameworkCore.PostgreSQL.Tests/project.json
+++ b/test/Npgsql.EntityFrameworkCore.PostgreSQL.Tests/project.json
@@ -6,7 +6,7 @@
     "Microsoft.EntityFrameworkCore.Relational": "1.0.1",
     "Microsoft.EntityFrameworkCore.Relational.Specification.Tests": "1.0.1",
     "Npgsql.EntityFrameworkCore.PostgreSQL": "1.0.2-*",
-    "Npgsql": "3.1.5"
+    "Npgsql": "3.1.8"
   },
   "testRunner": "xunit",
   "frameworks": {