diff --git a/aws-autoscaling.opam b/aws-autoscaling.opam
index 192d23654..ff90f9df2 100644
--- a/aws-autoscaling.opam
+++ b/aws-autoscaling.opam
@@ -23,7 +23,7 @@ depends: [
   "cohttp-lwt" {with-test & >= "2.4.0"}
   "cohttp-lwt-unix" {with-test & >= "2.4.0"}
   "lwt" {with-test & >= "4.0.0"}
-  "yojson" {with-test & >= "1.7.0" & < "2.0"}
+  "yojson" {with-test & >= "2.0"}
 ]
 build: [
   ["dune" "subst"] {pinned}
diff --git a/aws-cloudformation.opam b/aws-cloudformation.opam
index 33e63e930..c84fb2784 100644
--- a/aws-cloudformation.opam
+++ b/aws-cloudformation.opam
@@ -23,7 +23,7 @@ depends: [
   "cohttp-lwt" {with-test & >= "2.4.0"}
   "cohttp-lwt-unix" {with-test & >= "2.4.0"}
   "lwt" {with-test & >= "4.0.0"}
-  "yojson" {with-test & >= "1.7.0" & < "2.0"}
+  "yojson" {with-test & >= "2.0"}
 ]
 build: [
   ["dune" "subst"] {pinned}
diff --git a/aws-cloudtrail.opam b/aws-cloudtrail.opam
index da49ec7fe..235320dcc 100644
--- a/aws-cloudtrail.opam
+++ b/aws-cloudtrail.opam
@@ -23,7 +23,7 @@ depends: [
   "cohttp-lwt" {with-test & >= "2.4.0"}
   "cohttp-lwt-unix" {with-test & >= "2.4.0"}
   "lwt" {with-test & >= "4.0.0"}
-  "yojson" {with-test & >= "1.7.0" & < "2.0"}
+  "yojson" {with-test & >= "2.0"}
 ]
 build: [
   ["dune" "subst"] {pinned}
diff --git a/aws-cloudwatch.opam b/aws-cloudwatch.opam
index f92f89f7f..ced078119 100644
--- a/aws-cloudwatch.opam
+++ b/aws-cloudwatch.opam
@@ -23,7 +23,7 @@ depends: [
   "cohttp-lwt" {with-test & >= "2.4.0"}
   "cohttp-lwt-unix" {with-test & >= "2.4.0"}
   "lwt" {with-test & >= "4.0.0"}
-  "yojson" {with-test & >= "1.7.0" & < "2.0"}
+  "yojson" {with-test & >= "2.0"}
 ]
 build: [
   ["dune" "subst"] {pinned}
diff --git a/aws-ec2.opam b/aws-ec2.opam
index 48b0fbe0f..0b55eba62 100644
--- a/aws-ec2.opam
+++ b/aws-ec2.opam
@@ -23,7 +23,7 @@ depends: [
   "cohttp-lwt" {with-test & >= "2.4.0"}
   "cohttp-lwt-unix" {with-test & >= "2.4.0"}
   "lwt" {with-test & >= "4.0.0"}
-  "yojson" {with-test & >= "1.7.0" & < "2.0"}
+  "yojson" {with-test & >= "2.0"}
 ]
 build: [
   ["dune" "subst"] {pinned}
diff --git a/aws-elasticache.opam b/aws-elasticache.opam
index c1763c718..f56779e01 100644
--- a/aws-elasticache.opam
+++ b/aws-elasticache.opam
@@ -23,7 +23,7 @@ depends: [
   "cohttp-lwt" {with-test & >= "2.4.0"}
   "cohttp-lwt-unix" {with-test & >= "2.4.0"}
   "lwt" {with-test & >= "4.0.0"}
-  "yojson" {with-test & >= "1.7.0" & < "2.0"}
+  "yojson" {with-test & >= "2.0"}
 ]
 build: [
   ["dune" "subst"] {pinned}
diff --git a/aws-elasticloadbalancing.opam b/aws-elasticloadbalancing.opam
index f7c1a5043..0ae5a024f 100644
--- a/aws-elasticloadbalancing.opam
+++ b/aws-elasticloadbalancing.opam
@@ -23,7 +23,7 @@ depends: [
   "cohttp-lwt" {with-test & >= "2.4.0"}
   "cohttp-lwt-unix" {with-test & >= "2.4.0"}
   "lwt" {with-test & >= "4.0.0"}
-  "yojson" {with-test & >= "1.7.0" & < "2.0"}
+  "yojson" {with-test & >= "2.0"}
 ]
 build: [
   ["dune" "subst"] {pinned}
diff --git a/aws-gen.opam b/aws-gen.opam
index 1c5530fb1..6864d6cf1 100644
--- a/aws-gen.opam
+++ b/aws-gen.opam
@@ -15,11 +15,10 @@ dev-repo: "git+https://github.com/inhabitedtype/ocaml-aws.git"
 depends: [
   "ocaml" {>= "4.08"}
   "atdgen" {>= "2.10"}
-  "yojson"
+  "yojson" {>= "2.0"}
   "base-unix"
   "cmdliner" {>= "1.1.0"}
   "fmt"
-  "yojson" {>= "1.7.0" & < "2.0"}
   "ocaml-compiler-libs" {>= "0.11.0" }
   "ocamlgraph"
   "dune" {>= "2.7"}
diff --git a/aws-kms.opam b/aws-kms.opam
index a837b9518..1b5fb83e8 100644
--- a/aws-kms.opam
+++ b/aws-kms.opam
@@ -23,7 +23,7 @@ depends: [
   "cohttp-lwt" {with-test & >= "2.4.0"}
   "cohttp-lwt-unix" {with-test & >= "2.4.0"}
   "lwt" {with-test & >= "4.0.0"}
-  "yojson" {with-test & >= "1.7.0" & < "2.0"}
+  "yojson" {with-test & "2.0"}
 ]
 build: [
   ["dune" "subst"] {pinned}
diff --git a/aws-rds.opam b/aws-rds.opam
index 982bb0efb..6b1ab818d 100644
--- a/aws-rds.opam
+++ b/aws-rds.opam
@@ -23,7 +23,7 @@ depends: [
   "cohttp-lwt" {with-test & >= "2.4.0"}
   "cohttp-lwt-unix" {with-test & >= "2.4.0"}
   "lwt" {with-test & >= "4.0.0"}
-  "yojson" {with-test & >= "1.7.0" & < "2.0"}
+  "yojson" {with-test & >= "2.0"}
 ]
 build: [
   ["dune" "subst"] {pinned}
diff --git a/aws-route53.opam b/aws-route53.opam
index 9419979e1..1ddabe78d 100644
--- a/aws-route53.opam
+++ b/aws-route53.opam
@@ -23,7 +23,7 @@ depends: [
   "cohttp-lwt" {with-test & >= "2.4.0"}
   "cohttp-lwt-unix" {with-test & >= "2.4.0"}
   "lwt" {with-test & >= "4.0.0"}
-  "yojson" {with-test & >= "1.7.0" & < "2.0"}
+  "yojson" {with-test & "2.0"}
 ]
 build: [
   ["dune" "subst"] {pinned}
diff --git a/aws-sdb.opam b/aws-sdb.opam
index 4e0f79c6a..47318313a 100644
--- a/aws-sdb.opam
+++ b/aws-sdb.opam
@@ -23,7 +23,7 @@ depends: [
   "cohttp-lwt" {with-test & >= "2.4.0"}
   "cohttp-lwt-unix" {with-test & >= "2.4.0"}
   "lwt" {with-test & >= "4.0.0"}
-  "yojson" {with-test & >= "1.7.0" & < "2.0"}
+  "yojson" {with-test & >= "2.0"}
 ]
 build: [
   ["dune" "subst"] {pinned}
diff --git a/aws-sqs.opam b/aws-sqs.opam
index 62060d33c..b0fe96008 100644
--- a/aws-sqs.opam
+++ b/aws-sqs.opam
@@ -23,7 +23,7 @@ depends: [
   "cohttp-lwt" {with-test & >= "2.4.0"}
   "cohttp-lwt-unix" {with-test & >= "2.4.0"}
   "lwt" {with-test & >= "4.0.0"}
-  "yojson" {with-test & >= "1.7.0" & < "2.0"}
+  "yojson" {with-test & >= "2.0"}
 ]
 build: [
   ["dune" "subst"] {pinned}
diff --git a/aws-ssm.opam b/aws-ssm.opam
index e45765023..1da336b28 100644
--- a/aws-ssm.opam
+++ b/aws-ssm.opam
@@ -23,7 +23,7 @@ depends: [
   "cohttp-lwt" {with-test & >= "2.4.0"}
   "cohttp-lwt-unix" {with-test & >= "2.4.0"}
   "lwt" {with-test & >= "4.0.0"}
-  "yojson" {with-test & >= "1.7.0" & < "2.0"}
+  "yojson" {with-test & >= "2.0"}
 ]
 build: [
   ["dune" "subst"] {pinned}
diff --git a/aws-sts.opam b/aws-sts.opam
index d1c9d86a4..f31f6a2c4 100644
--- a/aws-sts.opam
+++ b/aws-sts.opam
@@ -23,7 +23,7 @@ depends: [
   "cohttp-lwt" {with-test & >= "2.4.0"}
   "cohttp-lwt-unix" {with-test & >= "2.4.0"}
   "lwt" {with-test & >= "4.0.0"}
-  "yojson" {with-test & >= "1.7.0" & < "2.0"}
+  "yojson" {with-test & >= "2.0"}
 ]
 build: [
   ["dune" "subst"] {pinned}