diff --git a/.github/workflows/ci-build.yaml b/.github/workflows/ci-build.yaml
index be51fb2f640f3..0ec3791b4364c 100644
--- a/.github/workflows/ci-build.yaml
+++ b/.github/workflows/ci-build.yaml
@@ -14,7 +14,7 @@ on:
 env:
   # Golang version to use across CI steps
   # renovate: datasource=golang-version packageName=golang
-  GOLANG_VERSION: '1.24.3'
+  GOLANG_VERSION: '1.26.5'
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
diff --git a/.github/workflows/image.yaml b/.github/workflows/image.yaml
index 4b2e44398380d..35c9ad4bc403c 100644
--- a/.github/workflows/image.yaml
+++ b/.github/workflows/image.yaml
@@ -53,7 +53,7 @@ jobs:
     with:
       # Note: cannot use env variables to set go-version (https://docs.github.com/en/actions/using-workflows/reusing-workflows#limitations)
       # renovate: datasource=golang-version packageName=golang
-      go-version: 1.24.3
+      go-version: 1.26.5
       platforms: ${{ needs.set-vars.outputs.platforms }}
       push: false
 
@@ -70,7 +70,7 @@ jobs:
       ghcr_image_name: ghcr.io/argoproj/argo-cd/argocd:${{ needs.set-vars.outputs.image-tag }}
       # Note: cannot use env variables to set go-version (https://docs.github.com/en/actions/using-workflows/reusing-workflows#limitations)
       # renovate: datasource=golang-version packageName=golang
-      go-version: 1.24.3
+      go-version: 1.26.5
       platforms: ${{ needs.set-vars.outputs.platforms }}
       push: true
     secrets:
diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index 31177ca6f1781..76d578ce70f8e 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -11,7 +11,7 @@ permissions: {}
 
 env:
   # renovate: datasource=golang-version packageName=golang
-  GOLANG_VERSION: '1.24.3' # Note: go-version must also be set in job argocd-image.with.go-version
+  GOLANG_VERSION: '1.26.5' # Note: go-version must also be set in job argocd-image.with.go-version
 
 jobs:
   argocd-image:
@@ -25,7 +25,7 @@ jobs:
       quay_image_name: quay.io/argoproj/argocd:${{ github.ref_name }}
       # Note: cannot use env variables to set go-version (https://docs.github.com/en/actions/using-workflows/reusing-workflows#limitations)
       # renovate: datasource=golang-version packageName=golang
-      go-version: 1.24.3
+      go-version: 1.26.5
       platforms: linux/amd64,linux/arm64,linux/s390x,linux/ppc64le
       push: true
     secrets:
diff --git a/Dockerfile b/Dockerfile
index 789283a40f8cf..e314a867a38d0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,7 +4,7 @@ ARG BASE_IMAGE=docker.io/library/ubuntu:24.04@sha256:80dd3c3b9c6cecb9f1667e9290b
 # Initial stage which pulls prepares build dependencies and CLI tooling we need for our final image
 # Also used as the image in CI jobs so needs all dependencies
 ####################################################################################################
-FROM docker.io/library/golang:1.24.3@sha256:86b4cff66e04d41821a17cea30c1031ed53e2635e2be99ae0b4a7d69336b5063 AS builder
+FROM docker.io/library/golang:1.26.5@sha256:2005724102f45917a63e9d092fc0e4ea56ea575048ce147caad5f5f61502c365 AS builder
 
 WORKDIR /tmp
 
@@ -103,7 +103,7 @@ RUN HOST_ARCH=$TARGETARCH NODE_ENV='production' NODE_ONLINE_ENV='online' NODE_OP
 ####################################################################################################
 # Argo CD Build stage which performs the actual build of Argo CD binaries
 ####################################################################################################
-FROM --platform=$BUILDPLATFORM docker.io/library/golang:1.24.3@sha256:86b4cff66e04d41821a17cea30c1031ed53e2635e2be99ae0b4a7d69336b5063 AS argocd-build
+FROM --platform=$BUILDPLATFORM docker.io/library/golang:1.26.5@sha256:2005724102f45917a63e9d092fc0e4ea56ea575048ce147caad5f5f61502c365 AS argocd-build
 
 WORKDIR /go/src/github.com/argoproj/argo-cd