diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 70de0cf..f18640f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -26,7 +26,7 @@ jobs:
             cpu: amd64
           #- os: windows
             #cpu: i386
-        branch: [version-1-2, version-1-4, version-1-6, version-2-0, devel]
+        branch: [version-1-6, version-2-0, devel]
         include:
           - target:
               os: linux
diff --git a/secp256k1.nim b/secp256k1.nim
index 7799d22..bee3855 100644
--- a/secp256k1.nim
+++ b/secp256k1.nim
@@ -1,4 +1,4 @@
-## Copyright (c) 2018-2020 Status Research & Development GmbH
+## Copyright (c) 2018-2023 Status Research & Development GmbH
 ## Licensed under either of
 ##  * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
 ##  * MIT license ([LICENSE-MIT](LICENSE-MIT))
@@ -7,10 +7,7 @@
 ## those terms.
 ##
 
-when (NimMajor, NimMinor) < (1, 4):
-  {.push raises: [Defect].}
-else:
-  {.push raises: [].}
+{.push raises: [].}
 
 import
   strformat, typetraits,
diff --git a/secp256k1.nimble b/secp256k1.nimble
index 66cf15d..d22fc67 100644
--- a/secp256k1.nimble
+++ b/secp256k1.nimble
@@ -8,7 +8,7 @@ license       = "Apache License 2.0"
 skipDirs      = @["tests"]
 installDirs   = @["vendor"]
 
-requires "nim >= 1.2.0",
+requires "nim >= 1.6.0",
          "stew",
          "nimcrypto"
 
@@ -17,9 +17,8 @@ let lang = getEnv("NIMLANG", "c") # Which backend (c/cpp/js)
 let flags = getEnv("NIMFLAGS", "") # Extra flags for the compiler
 let verbose = getEnv("V", "") notin ["", "0"]
 
-let styleCheckStyle = if (NimMajor, NimMinor) < (1, 6): "hint" else: "error"
 let cfg =
-  " --styleCheck:usages --styleCheck:" & styleCheckStyle &
+  " --styleCheck:usages --styleCheck:error" &
   (if verbose: "" else: " --verbosity:0 --hints:off") &
   " --skipParentCfg --skipUserCfg --outdir:build --nimcache:build/nimcache -f"
 
diff --git a/secp256k1/abi.nim b/secp256k1/abi.nim
index 5253edd..9bb5528 100644
--- a/secp256k1/abi.nim
+++ b/secp256k1/abi.nim
@@ -18,13 +18,7 @@ const compileFlags =
   " -I" & quoteShell(srcPath) &
   asmFlags
 
-when (NimMajor, NimMinor) >= (1, 4):
-  {.compile(srcPath & "/secp256k1.c", compileFlags).}
-else:
-  # Per-compile flags not supported in 1.2
-  {.passc: compileFlags.}
-  {.compile: srcPath & "/secp256k1.c".}
-
+{.compile(srcPath & "/secp256k1.c", compileFlags).}
 {.compile: srcPath & "/precomputed_ecmult.c".}
 {.compile: srcPath & "/precomputed_ecmult_gen.c".}