diff --git a/.circleci/config.yml b/.circleci/config.yml
index 733b5d40f33f..04ccbf9f8af8 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -3,7 +3,7 @@ version: 2
 defaults: &linux_defaults
   working_directory: /go/src/github.com/cosmos/cosmos-sdk
   docker:
-    - image: circleci/golang:1.12.4
+    - image: circleci/golang:1.12.5
 
 
 ############
@@ -15,7 +15,7 @@ macos_config: &macos_defaults
     xcode: "10.1.0"
   working_directory: /Users/distiller/project/src/github.com/cosmos/cosmos-sdk
   environment:
-    GO_VERSION: "1.12.4"
+    GO_VERSION: "1.12.5"
 
 set_macos_env: &macos_env
   run:
@@ -257,7 +257,7 @@ jobs:
         GOPATH: /home/circleci/.go_workspace/
         GOOS: linux
         GOARCH: amd64
-        GO_VERSION: "1.12.4"
+        GO_VERSION: "1.12.5"
       parallelism: 1
       steps:
         - checkout
diff --git a/.pending/improvements/gaia/4261-Upgrade-toolcha b/.pending/improvements/gaia/4261-Upgrade-toolcha
deleted file mode 100644
index 0ab71d7c0f0e..000000000000
--- a/.pending/improvements/gaia/4261-Upgrade-toolcha
+++ /dev/null
@@ -1 +0,0 @@
-#4261 Upgrade toolchain to Go 1.12.4. Docs and instructions amended accordingly.
diff --git a/.pending/improvements/gaia/4343-Upgrade-toolcha b/.pending/improvements/gaia/4343-Upgrade-toolcha
new file mode 100644
index 000000000000..484d522c0d05
--- /dev/null
+++ b/.pending/improvements/gaia/4343-Upgrade-toolcha
@@ -0,0 +1 @@
+#4343 Upgrade toolchain to Go 1.12.5.
diff --git a/README.md b/README.md
index 7146fdb018f2..cb0a316d30e7 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ It is being used to build `Gaia`, the first implementation of the Cosmos Hub.
 **WARNING**: The SDK has mostly stabilized, but we are still making some
 breaking changes.
 
-**Note**: Requires [Go 1.12.4+](https://golang.org/dl/)
+**Note**: Requires [Go 1.12+](https://golang.org/dl/)
 
 ## Cosmos Hub Mainnet
 
diff --git a/docs/cosmos-hub/installation.md b/docs/cosmos-hub/installation.md
index 8895e96882b3..620d6257a497 100644
--- a/docs/cosmos-hub/installation.md
+++ b/docs/cosmos-hub/installation.md
@@ -14,7 +14,7 @@ source ~/.bash_profile
 ```
 
 ::: tip
-**Go 1.12.4+** is required for the Cosmos SDK.
+**Go 1.12+** is required for the Cosmos SDK.
 :::
 
 ### Install the binaries
diff --git a/docs/translations/cn/cosmos-hub/installation.md b/docs/translations/cn/cosmos-hub/installation.md
index bc0a9c2332e6..254d4bb2bf6e 100644
--- a/docs/translations/cn/cosmos-hub/installation.md
+++ b/docs/translations/cn/cosmos-hub/installation.md
@@ -15,7 +15,7 @@ source ~/.bash_profile
 ```
 
 ::: tip
-Cosmos SDK需要安装**Go 1.12.4+**
+Cosmos SDK需要安装**Go 1.12+**
 :::
 
 ### 安装二进制执行程序
diff --git a/scripts/install/install_sdk_arm.sh b/scripts/install/install_sdk_arm.sh
index 770c4ec9827a..27c9dc52c508 100644
--- a/scripts/install/install_sdk_arm.sh
+++ b/scripts/install/install_sdk_arm.sh
@@ -4,7 +4,7 @@
 BRANCH=master
 REPO=github.com/cosmos/cosmos-sdk
 
-GO_VERSION=1.12.4
+GO_VERSION=1.12.5
 
 sudo apt-get update -y
 sudo apt-get upgrade -y
diff --git a/scripts/install/install_sdk_bsd.sh b/scripts/install/install_sdk_bsd.sh
index cd46400d07cf..f4b99fb6fdbc 100644
--- a/scripts/install/install_sdk_bsd.sh
+++ b/scripts/install/install_sdk_bsd.sh
@@ -16,7 +16,7 @@
 set BRANCH=master
 set REPO=github.com/cosmos/cosmos-sdk
 
-set GO_VERSION=1.12.4
+set GO_VERSION=1.12.5
 
 sudo pkg update
 
diff --git a/scripts/install/install_sdk_ubuntu.sh b/scripts/install/install_sdk_ubuntu.sh
index 8e7107df413d..4ba70fb78a48 100644
--- a/scripts/install/install_sdk_ubuntu.sh
+++ b/scripts/install/install_sdk_ubuntu.sh
@@ -7,7 +7,7 @@
 BRANCH=master
 REPO=github.com/cosmos/cosmos-sdk
 
-GO_VERSION=1.12.4
+GO_VERSION=1.12.5
 
 sudo apt-get update -y
 sudo apt-get upgrade -y