diff --git a/garden-service/src/config/module.ts b/garden-service/src/config/module.ts
index be2bdc05e3..20e7fbfbb1 100644
--- a/garden-service/src/config/module.ts
+++ b/garden-service/src/config/module.ts
@@ -219,7 +219,7 @@ export const moduleConfigSchema = baseModuleSpecSchema
   .description("The configuration for a module.")
   .unknown(false)
 
-export function serializeConfig(moduleConfig: ModuleConfig) {
+export function serializeConfig(moduleConfig: Partial<ModuleConfig>) {
   return stableStringify(moduleConfig)
 }
 
diff --git a/garden-service/src/vcs/vcs.ts b/garden-service/src/vcs/vcs.ts
index 2fd4d7d896..bbfcc55ef1 100644
--- a/garden-service/src/vcs/vcs.ts
+++ b/garden-service/src/vcs/vcs.ts
@@ -237,7 +237,8 @@ export function getVersionString(moduleConfig: ModuleConfig, treeVersions: Named
  * The versions argument should consist of moduleConfig's tree version, and the tree versions of its dependencies.
  */
 export function hashVersions(moduleConfig: ModuleConfig, versions: NamedTreeVersion[]) {
-  const configString = serializeConfig(moduleConfig)
+  // We omit the configPath, path, and outputs fields as these can between users and runtimes
+  const configString = serializeConfig(omit(moduleConfig, ["configPath", "path", "outputs"]))
   const versionStrings = sortBy(versions, "name").map((v) => `${v.name}_${v.contentHash}`)
   return hashStrings([configString, ...versionStrings])
 }
diff --git a/garden-service/test/data/test-projects/fixed-version-hashes-1/garden.yml b/garden-service/test/data/test-projects/fixed-version-hashes-1/garden.yml
new file mode 100644
index 0000000000..4a108f6468
--- /dev/null
+++ b/garden-service/test/data/test-projects/fixed-version-hashes-1/garden.yml
@@ -0,0 +1,10 @@
+kind: Project
+name: test-project-fixed-version-hashes-1
+environments:
+  - name: local
+    providers:
+      - name: test-plugin
+      - name: test-plugin-b
+  - name: other
+variables:
+  some: variable
diff --git a/garden-service/test/data/test-projects/fixed-version-hashes-1/module-a/garden.yml b/garden-service/test/data/test-projects/fixed-version-hashes-1/module-a/garden.yml
new file mode 100644
index 0000000000..25d72e1334
--- /dev/null
+++ b/garden-service/test/data/test-projects/fixed-version-hashes-1/module-a/garden.yml
@@ -0,0 +1,24 @@
+kind: Module
+name: module-a
+type: test
+services:
+  - name: service-a
+    env:
+      TEST_LOCAL_ENV: ${local.env.MODULE_A_TEST_ENV_VAR}
+      TEST_ENV: ${var.some}
+build:
+  command: [echo, A]
+tests:
+  - name: unit
+    command: [echo, OK]
+  - name: integration
+    command: [echo, OK]
+tasks:
+  - name: task-a-1
+    command: [echo, task-a-1]
+  - name: task-a-2
+    command: [echo, task-a-2]
+    dependencies:
+      - task-a-1
+    env:
+      TASK_OUTPUT: ${runtime.tasks.task-a-1.outputs.log}
\ No newline at end of file
diff --git a/garden-service/test/data/test-projects/fixed-version-hashes-1/module-a/hello.txt b/garden-service/test/data/test-projects/fixed-version-hashes-1/module-a/hello.txt
new file mode 100644
index 0000000000..845d2016fe
--- /dev/null
+++ b/garden-service/test/data/test-projects/fixed-version-hashes-1/module-a/hello.txt
@@ -0,0 +1 @@
+hello module-a
diff --git a/garden-service/test/data/test-projects/fixed-version-hashes-1/module-b/garden.yml b/garden-service/test/data/test-projects/fixed-version-hashes-1/module-b/garden.yml
new file mode 100644
index 0000000000..f09543ae96
--- /dev/null
+++ b/garden-service/test/data/test-projects/fixed-version-hashes-1/module-b/garden.yml
@@ -0,0 +1,17 @@
+kind: Module
+name: module-b
+type: test
+services:
+  - name: service-b
+    dependencies:
+      - service-a
+build:
+  command: [echo, B]
+  dependencies:
+    - module-a
+tests:
+  - name: unit
+    command: [echo, OK]
+tasks:
+  - name: task-b
+    command: [echo, OK]
diff --git a/garden-service/test/data/test-projects/fixed-version-hashes-1/module-b/hello.txt b/garden-service/test/data/test-projects/fixed-version-hashes-1/module-b/hello.txt
new file mode 100644
index 0000000000..15d8098c2f
--- /dev/null
+++ b/garden-service/test/data/test-projects/fixed-version-hashes-1/module-b/hello.txt
@@ -0,0 +1 @@
+hello module-b
diff --git a/garden-service/test/data/test-projects/fixed-version-hashes-1/module-c/garden.yml b/garden-service/test/data/test-projects/fixed-version-hashes-1/module-c/garden.yml
new file mode 100644
index 0000000000..0ff5a5ca02
--- /dev/null
+++ b/garden-service/test/data/test-projects/fixed-version-hashes-1/module-c/garden.yml
@@ -0,0 +1,16 @@
+kind: Module
+name: module-c
+type: test
+services:
+  - name: service-c
+build:
+  dependencies:
+    - module-b
+tests:
+  - name: unit
+    command: [echo, OK]
+  - name: integ
+    command: [echo, OK]
+tasks:
+  - name: task-c
+    command: [echo, OK]
diff --git a/garden-service/test/data/test-projects/fixed-version-hashes-1/module-c/hello.txt b/garden-service/test/data/test-projects/fixed-version-hashes-1/module-c/hello.txt
new file mode 100644
index 0000000000..45c058d59e
--- /dev/null
+++ b/garden-service/test/data/test-projects/fixed-version-hashes-1/module-c/hello.txt
@@ -0,0 +1 @@
+hello module-c
diff --git a/garden-service/test/data/test-projects/fixed-version-hashes-2/garden.yml b/garden-service/test/data/test-projects/fixed-version-hashes-2/garden.yml
new file mode 100644
index 0000000000..cad6c6c642
--- /dev/null
+++ b/garden-service/test/data/test-projects/fixed-version-hashes-2/garden.yml
@@ -0,0 +1,10 @@
+kind: Project
+name: test-project-fixed-version-hashes-2
+environments:
+  - name: env-name-that-is-different-from-fixed-version-hashes-1
+    providers:
+      - name: test-plugin
+      - name: test-plugin-b
+  - name: other
+variables:
+  some: variable
diff --git a/garden-service/test/data/test-projects/fixed-version-hashes-2/module-a/garden.yml b/garden-service/test/data/test-projects/fixed-version-hashes-2/module-a/garden.yml
new file mode 100644
index 0000000000..25d72e1334
--- /dev/null
+++ b/garden-service/test/data/test-projects/fixed-version-hashes-2/module-a/garden.yml
@@ -0,0 +1,24 @@
+kind: Module
+name: module-a
+type: test
+services:
+  - name: service-a
+    env:
+      TEST_LOCAL_ENV: ${local.env.MODULE_A_TEST_ENV_VAR}
+      TEST_ENV: ${var.some}
+build:
+  command: [echo, A]
+tests:
+  - name: unit
+    command: [echo, OK]
+  - name: integration
+    command: [echo, OK]
+tasks:
+  - name: task-a-1
+    command: [echo, task-a-1]
+  - name: task-a-2
+    command: [echo, task-a-2]
+    dependencies:
+      - task-a-1
+    env:
+      TASK_OUTPUT: ${runtime.tasks.task-a-1.outputs.log}
\ No newline at end of file
diff --git a/garden-service/test/data/test-projects/fixed-version-hashes-2/module-a/hello.txt b/garden-service/test/data/test-projects/fixed-version-hashes-2/module-a/hello.txt
new file mode 100644
index 0000000000..845d2016fe
--- /dev/null
+++ b/garden-service/test/data/test-projects/fixed-version-hashes-2/module-a/hello.txt
@@ -0,0 +1 @@
+hello module-a
diff --git a/garden-service/test/data/test-projects/fixed-version-hashes-2/module-b/garden.yml b/garden-service/test/data/test-projects/fixed-version-hashes-2/module-b/garden.yml
new file mode 100644
index 0000000000..f09543ae96
--- /dev/null
+++ b/garden-service/test/data/test-projects/fixed-version-hashes-2/module-b/garden.yml
@@ -0,0 +1,17 @@
+kind: Module
+name: module-b
+type: test
+services:
+  - name: service-b
+    dependencies:
+      - service-a
+build:
+  command: [echo, B]
+  dependencies:
+    - module-a
+tests:
+  - name: unit
+    command: [echo, OK]
+tasks:
+  - name: task-b
+    command: [echo, OK]
diff --git a/garden-service/test/data/test-projects/fixed-version-hashes-2/module-b/hello.txt b/garden-service/test/data/test-projects/fixed-version-hashes-2/module-b/hello.txt
new file mode 100644
index 0000000000..15d8098c2f
--- /dev/null
+++ b/garden-service/test/data/test-projects/fixed-version-hashes-2/module-b/hello.txt
@@ -0,0 +1 @@
+hello module-b
diff --git a/garden-service/test/data/test-projects/fixed-version-hashes-2/module-c/garden.yml b/garden-service/test/data/test-projects/fixed-version-hashes-2/module-c/garden.yml
new file mode 100644
index 0000000000..0ff5a5ca02
--- /dev/null
+++ b/garden-service/test/data/test-projects/fixed-version-hashes-2/module-c/garden.yml
@@ -0,0 +1,16 @@
+kind: Module
+name: module-c
+type: test
+services:
+  - name: service-c
+build:
+  dependencies:
+    - module-b
+tests:
+  - name: unit
+    command: [echo, OK]
+  - name: integ
+    command: [echo, OK]
+tasks:
+  - name: task-c
+    command: [echo, OK]
diff --git a/garden-service/test/data/test-projects/fixed-version-hashes-2/module-c/hello.txt b/garden-service/test/data/test-projects/fixed-version-hashes-2/module-c/hello.txt
new file mode 100644
index 0000000000..45c058d59e
--- /dev/null
+++ b/garden-service/test/data/test-projects/fixed-version-hashes-2/module-c/hello.txt
@@ -0,0 +1 @@
+hello module-c
diff --git a/garden-service/test/unit/src/garden.ts b/garden-service/test/unit/src/garden.ts
index 2b06292bf3..48fddd69e8 100644
--- a/garden-service/test/unit/src/garden.ts
+++ b/garden-service/test/unit/src/garden.ts
@@ -3065,6 +3065,63 @@ describe("Garden", () => {
 
       expect(result).to.not.eql(version)
     })
+
+    context("test against fixed version hashes", async () => {
+      const moduleAVersionString = "v-0cf3cb04c0"
+      const moduleBVersionString = "v-db85090197"
+      const moduleCVersionString = "v-18ffe09ae4"
+
+      it("should return the same module versions between runtimes", async () => {
+        const projectRoot = getDataDir("test-projects", "fixed-version-hashes-1")
+
+        process.env.MODULE_A_TEST_ENV_VAR = "foo"
+
+        const garden = await makeTestGarden(projectRoot)
+        const graph = await garden.getConfigGraph(garden.log)
+        const moduleA = await graph.getModule("module-a")
+        const moduleB = await graph.getModule("module-b")
+        const moduleC = await graph.getModule("module-c")
+        expect(moduleA.version.versionString).to.equal(moduleAVersionString)
+        expect(moduleB.version.versionString).to.equal(moduleBVersionString)
+        expect(moduleC.version.versionString).to.equal(moduleCVersionString)
+
+        delete process.env.TEST_ENV_VAR
+      })
+
+      it("should return the same module versions for identiclal modules in different projects", async () => {
+        const projectRoot = getDataDir("test-projects", "fixed-version-hashes-2")
+
+        process.env.MODULE_A_TEST_ENV_VAR = "foo"
+
+        const garden = await makeTestGarden(projectRoot)
+        const graph = await garden.getConfigGraph(garden.log)
+        const moduleA = await graph.getModule("module-a")
+        const moduleB = await graph.getModule("module-b")
+        const moduleC = await graph.getModule("module-c")
+        expect(moduleA.version.versionString).to.equal(moduleAVersionString)
+        expect(moduleB.version.versionString).to.equal(moduleBVersionString)
+        expect(moduleC.version.versionString).to.equal(moduleCVersionString)
+
+        delete process.env.MODULE_A_TEST_ENV_VAR
+      })
+
+      it("should not return the same module versions if templated variables change", async () => {
+        const projectRoot = getDataDir("test-projects", "fixed-version-hashes-1")
+
+        process.env.MODULE_A_TEST_ENV_VAR = "bar"
+
+        const garden = await makeTestGarden(projectRoot)
+        const graph = await garden.getConfigGraph(garden.log)
+        const moduleA = await graph.getModule("module-a")
+        const moduleB = await graph.getModule("module-b")
+        const moduleC = await graph.getModule("module-c")
+        expect(moduleA.version.versionString).to.not.equal(moduleAVersionString)
+        expect(moduleB.version.versionString).to.equal(moduleBVersionString)
+        expect(moduleC.version.versionString).to.equal(moduleCVersionString)
+
+        delete process.env.MODULE_A_TEST_ENV_VAR
+      })
+    })
   })
 
   describe("loadExtSourcePath", () => {
diff --git a/garden-service/test/unit/src/vcs/vcs.ts b/garden-service/test/unit/src/vcs/vcs.ts
index dbe9cbdb9b..bf594a0b70 100644
--- a/garden-service/test/unit/src/vcs/vcs.ts
+++ b/garden-service/test/unit/src/vcs/vcs.ts
@@ -261,6 +261,21 @@ describe("VcsHandler", () => {
           getVersionString(config, [namedVersionB, namedVersionA, namedVersionC])
         )
       })
+
+      it("should be stable between runtimes", async () => {
+        const projectRoot = getDataDir("test-projects", "fixed-version-hashes-1")
+
+        // fixed-version-hashes-1 expects this var to be set
+        process.env.MODULE_A_TEST_ENV_VAR = "foo"
+
+        const garden = await makeTestGarden(projectRoot)
+        const config = await garden.resolveModuleConfig(garden.log, "module-a")
+
+        const fixedVersionString = "v-72ab6d8477"
+        expect(getVersionString(config, [namedVersionA, namedVersionB, namedVersionC])).to.eql(fixedVersionString)
+
+        delete process.env.TEST_ENV_VAR
+      })
     })
   })