diff --git a/aws-lambda/pygeoapi-serverless-config.yml b/aws-lambda/pygeoapi-serverless-config.yml
index df5fc84..7063582 100644
--- a/aws-lambda/pygeoapi-serverless-config.yml
+++ b/aws-lambda/pygeoapi-serverless-config.yml
@@ -184,7 +184,7 @@ datasets:
             spatial:
                 bbox: [-180,-90,180,90]
             temporal:
-                begin: None
+                begin:
                 end: now  # or empty
         provider:
             name: SQLite
@@ -215,7 +215,7 @@ datasets:
             spatial:
                 bbox: [-31.2687, 32.5898, -6.18992, 42.152]
             temporal:
-                begin: None
+                begin:
                 end: now  # or empty
         provider:
             name: GeoPackage
@@ -244,7 +244,7 @@ datasets:
             spatial:
                 bbox: [28.9845376683957, -4.48174334765485, 30.866396969019, -2.3096796]
             temporal:
-                begin: None
+                begin:
                 end: now  # or empty
         provider:
             name: PostgreSQL
@@ -279,7 +279,7 @@ datasets:
             spatial:
                 bbox: [50.7539, 7.21097, 53.4658, 3.37087]
             temporal:
-                begin: None
+                begin:
                 end: now  # or empty
         provider:
             name: OGR
diff --git a/docker/default.config.yml b/docker/default.config.yml
index f945767..a230e96 100644
--- a/docker/default.config.yml
+++ b/docker/default.config.yml
@@ -187,7 +187,7 @@ datasets:
             spatial:
                 bbox: [-180, -90, 180, 90]
             temporal:
-                begin: None
+                begin:
                 end: now  # or empty
         provider:
             name: SQLite
@@ -218,7 +218,7 @@ datasets:
 #            spatial:
 #                bbox: [-31.2687, 32.5898, -6.18992, 42.152]
 #            temporal:
-#                begin: None
+#                begin:
 #                end: now  # or empty
 #        provider:
 #            name: GeoPackage
@@ -247,7 +247,7 @@ datasets:
 #            spatial:
 #                bbox: [28.9845376683957, -4.48174334765485, 30.866396969019, -2.3096796]
 #            temporal:
-#                begin: None
+#                begin:
 #                end: now  # or empty
 #        provider:
 #            name: PostgreSQL
@@ -282,7 +282,7 @@ datasets:
             spatial:
                 bbox: [50.7539, 7.21097, 53.4658, 3.37087]
             temporal:
-                begin: None
+                begin:
                 end: now  # or empty
         provider:
             name: OGR
@@ -328,7 +328,7 @@ datasets:
             spatial:
                 bbox: [-112.108489, 39.854053, -111.028628, 40.460098]
             temporal:
-                begin: None
+                begin:
                 end: now  # or empty
         provider:
             name: OGR
@@ -373,7 +373,7 @@ datasets:
             spatial:
                 bbox: [36.0, 17.0, 46.0, 18.0]
             temporal:
-                begin: None
+                begin:
                 end: now  # or empty
         provider:
             name: OGR
@@ -423,7 +423,7 @@ datasets:
             spatial:
                 bbox: [-31.2687, 32.5898, -6.18992, 42.152]
             temporal:
-                begin: None
+                begin:
                 end: now  # or empty
         provider:
             name: OGR
@@ -503,7 +503,7 @@ datasets:
             spatial:
                 bbox: [50.7539, 7.21097, 53.4658, 3.37087]
             temporal:
-                begin: None
+                begin:
                 end: now  # or empty
         provider:
             name: OGR
@@ -545,7 +545,7 @@ datasets:
             spatial:
                 bbox: [50.7539, 7.21097, 53.4658, 3.37087]
             temporal:
-                begin: None
+                begin:
                 end: now  # or empty
         provider:
             name: OGR
@@ -586,7 +586,7 @@ datasets:
 #            spatial:
 #                bbox: [-180, -90, 180, 90]
 #            temporal:
-#                begin: None
+#                begin:
 #                end: now  # or empty
 #        provider:
 #            name: OGR
diff --git a/tests/pygeoapi-test-ogr-config.yml b/tests/pygeoapi-test-ogr-config.yml
index e730f24..6597b27 100644
--- a/tests/pygeoapi-test-ogr-config.yml
+++ b/tests/pygeoapi-test-ogr-config.yml
@@ -103,7 +103,7 @@ datasets:
             spatial:
                 bbox: [50.7539, 7.21097, 53.4658, 3.37087]
             temporal:
-                begin: None
+                begin:
                 end: now  # or empty
         provider:
             name: OGR
@@ -151,7 +151,7 @@ datasets:
             spatial:
                 bbox: [50.7539, 7.21097, 53.4658, 3.37087]
             temporal:
-                begin: None
+                begin:
                 end: now  # or empty
         provider:
             name: OGR
@@ -197,7 +197,7 @@ datasets:
             spatial:
                 bbox: [-112.108489, 39.854053, -111.028628, 40.460098]
             temporal:
-                begin: None
+                begin:
                 end: now  # or empty
         provider:
             name: OGR
@@ -242,7 +242,7 @@ datasets:
             spatial:
                 bbox: [36.0, 17.0, 46.0, 18.0]
             temporal:
-                begin: None
+                begin:
                 end: now  # or empty
         provider:
             name: OGR
@@ -292,7 +292,7 @@ datasets:
             spatial:
                 bbox: [-31.2687, 32.5898, -6.18992, 42.152]
             temporal:
-                begin: None
+                begin:
                 end: now  # or empty
         provider:
             name: OGR
@@ -333,7 +333,7 @@ datasets:
             spatial:
                 bbox: [-180, -90, 180, 90]
             temporal:
-                begin: None
+                begin:
                 end: now  # or empty
         provider:
             name: OGR